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Differential D87901

[Driver] Filter out <libdir>/gcc and <libdir>/gcc-cross if they do not exists
ClosedPublic

Authored by dmantipov on Sep 18 2020, 6:12 AM.

Details

Reviewers
manojgupta
sthibaul
dlj
aganea
MaskRay
Commits
rGbc868da0e77a: [Driver] Filter out <libdir>/gcc and <libdir>/gcc-cross if they do not exists
Summary

For the regular (system-wide) installation it's OK to assume that Clang is installed alongside with GCC, probably with the same prefix (usually /usr on most Linux systems). But this is not so for standalone installations with custom prefix, where the number of VFS lookups for the suitable GCC installation may be substantially reduced by filtering out <libdir>/gcc and (Debian-specific) <libdir>/gcc-cross early, before trying <libdir>/gcc/<cpu-vendor-os> and <libdir>/gcc-cross/<cpu-vendor-os>, respectively.

For my installation configured with -DCMAKE_INSTALL_PREFIX=/home/antipov/.local/llvm-12.0.0, it's possible to filter out 80 of 200 VFS lookups, from:

stat("/home/antipov/.local/llvm-12.0.0/bin/..", {st_mode=S_IFDIR|0755, st_size=73, ...}) = 0
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib64", {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-pc-linux-gnu/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-redhat-linux6E/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-redhat-linux/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-suse-linux/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-manbo-linux-gnu/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-slackware-linux/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-amazon-linux/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-linux-android/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib32", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-9/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-8/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-7/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-6/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-4/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-3/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-2/root/usr", 0x7fff61cc4e00) = -1 ENOENT (No such file or directory)
stat("/usr", {st_mode=S_IFDIR|0755, st_size=155, ...}) = 0
stat("/usr/lib64", {st_mode=S_IFDIR|0555, st_size=167936, ...}) = 0
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-pc-linux-gnu/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-redhat-linux6E/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-redhat-linux/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-suse-linux/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-manbo-linux-gnu/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-slackware-linux/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-amazon-linux/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-linux-android/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
stat("/usr/lib", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-pc-linux-gnu/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-redhat-linux6E/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
stat("/usr/lib/gcc/x86_64-redhat-linux/10/64/crtbegin.o", 0x7fff61cc3e70) = -1 ENOENT (No such file or directory)
stat("/usr/lib/gcc/x86_64-redhat-linux/10/crtbegin.o", {st_mode=S_IFREG|0644, st_size=2960, ...}) = 0
stat("/usr/lib/gcc/x86_64-redhat-linux/10/64/crtbegin.o", 0x7fff61cc3c60) = -1 ENOENT (No such file or directory)
stat("/usr/lib/gcc/x86_64-redhat-linux/10/32/crtbegin.o", {st_mode=S_IFREG|0644, st_size=2056, ...}) = 0
stat("/usr/lib/gcc/x86_64-redhat-linux/10/x32/crtbegin.o", 0x7fff61cc3cd0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-redhat-linux/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-suse-linux/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-manbo-linux-gnu/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-slackware-linux/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-amazon-linux/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-android/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
stat("/usr/lib32", 0x7fff61cc4e00)      = -1 ENOENT (No such file or directory)
stat("/usr/lib", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
openat(AT_FDCWD, "/usr/lib/gcc/i686-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i686-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-linux-gnu/gcc/i686-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i686-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-pc-linux-gnu/gcc/i686-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i486-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i486-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i486-linux-gnu/gcc/i486-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i386-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-linux-gnu/gcc/i386-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i386-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-redhat-linux6E/gcc/i386-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i686-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-redhat-linux/gcc/i686-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i586-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-redhat-linux/gcc/i586-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i386-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-redhat-linux/gcc/i386-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i586-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-suse-linux/gcc/i586-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i486-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i486-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i486-slackware-linux/gcc/i486-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-montavista-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i686-montavista-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-montavista-linux/gcc/i686-montavista-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i586-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-linux-gnu/gcc/i586-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i686-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-linux-android/gcc/i686-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i386-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-gnu/gcc/i386-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i486-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i486-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i486-gnu/gcc/i486-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i586-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-gnu/gcc/i586-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i686-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-gnu/gcc/i686-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc-cross/i386-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-unknown-linux-gnu/gcc/i386-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)

to:

stat("/home/antipov/.local/llvm-12.0.0/bin/..", {st_mode=S_IFDIR|0755, st_size=73, ...}) = 0
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib64", {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib64/gcc-cross", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-pc-linux-gnu/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-redhat-linux6E/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-redhat-linux/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-suse-linux/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-manbo-linux-gnu/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-slackware-linux/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-amazon-linux/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-linux-android/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/antipov/.local/llvm-12.0.0/bin/../lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib32", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/home/antipov/.local/llvm-12.0.0/bin/../lib", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-9/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-8/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-7/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-6/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-4/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-3/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/opt/rh/devtoolset-2/root/usr", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
stat("/usr", {st_mode=S_IFDIR|0755, st_size=155, ...}) = 0
stat("/usr/lib64", {st_mode=S_IFDIR|0555, st_size=167936, ...}) = 0
stat("/usr/lib64/gcc", 0x7ffe4ed007d0)  = -1 ENOENT (No such file or directory)
stat("/usr/lib64/gcc-cross", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-pc-linux-gnu/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-redhat-linux6E/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-redhat-linux/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-suse-linux/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-manbo-linux-gnu/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-slackware-linux/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-amazon-linux/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-linux-android/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
stat("/usr/lib", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/usr/lib/gcc", {st_mode=S_IFDIR|0755, st_size=33, ...}) = 0
stat("/usr/lib/gcc-cross", 0x7ffe4ed007d0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-pc-linux-gnu/gcc/x86_64-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-redhat-linux6E/gcc/x86_64-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
stat("/usr/lib/gcc/x86_64-redhat-linux/10/64/crtbegin.o", 0x7ffe4ecff840) = -1 ENOENT (No such file or directory)
stat("/usr/lib/gcc/x86_64-redhat-linux/10/crtbegin.o", {st_mode=S_IFREG|0644, st_size=2960, ...}) = 0
stat("/usr/lib/gcc/x86_64-redhat-linux/10/64/crtbegin.o", 0x7ffe4ecff630) = -1 ENOENT (No such file or directory)
stat("/usr/lib/gcc/x86_64-redhat-linux/10/32/crtbegin.o", {st_mode=S_IFREG|0644, st_size=2056, ...}) = 0
stat("/usr/lib/gcc/x86_64-redhat-linux/10/x32/crtbegin.o", 0x7ffe4ecff6a0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-redhat-linux/gcc/x86_64-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-suse-linux/gcc/x86_64-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-manbo-linux-gnu/gcc/x86_64-manbo-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-slackware-linux/gcc/x86_64-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux/gcc/x86_64-unknown-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-amazon-linux/gcc/x86_64-amazon-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-android/gcc/x86_64-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-unknown-linux-gnu/gcc/x86_64-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
stat("/usr/lib32", 0x7ffe4ed007d0)      = -1 ENOENT (No such file or directory)
stat("/usr/lib", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
openat(AT_FDCWD, "/usr/lib/gcc/i686-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-linux-gnu/gcc/i686-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-pc-linux-gnu/gcc/i686-pc-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i486-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i486-linux-gnu/gcc/i486-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-linux-gnu/gcc/i386-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-redhat-linux6E/gcc/i386-redhat-linux6E", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-redhat-linux/gcc/i686-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-redhat-linux/gcc/i586-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-redhat-linux/gcc/i386-redhat-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-suse-linux/gcc/i586-suse-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i486-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i486-slackware-linux/gcc/i486-slackware-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-montavista-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-montavista-linux/gcc/i686-montavista-linux", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-linux-gnu/gcc/i586-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-linux-android/gcc/i686-linux-android", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-gnu/gcc/i386-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i486-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i486-gnu/gcc/i486-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i586-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i586-gnu/gcc/i586-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i686-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i686-gnu/gcc/i686-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gcc/i386-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/i386-unknown-linux-gnu/gcc/i386-unknown-linux-gnu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (No such file or directory)

Diff Detail

Event Timeline

dmantipov created this revision.Sep 18 2020, 6:12 AM
Herald added a project: Restricted Project. · View Herald TranscriptSep 18 2020, 6:12 AM
Herald added subscribers: cfe-commits, fedor.sergeev. · View Herald Transcript
dmantipov requested review of this revision.Sep 18 2020, 6:12 AM
Harbormaster completed remote builds in B72161: Diff 292773.Sep 18 2020, 6:45 AM
dmantipov updated this revision to Diff 293955.Sep 24 2020, 12:39 AM

Prefer a bit more meaningful variable names.

Harbormaster completed remote builds in B72771: Diff 293955.Sep 24 2020, 1:27 AM
dmantipov added a reviewer: aganea.Sep 25 2020, 11:40 PM
dmantipov added a reviewer: MaskRay.
aganea added a comment.Sep 26 2020, 5:23 AM

Thanks for the patch! I'll let others review it, but I was just being curious: what tool do you use for intercepting & printing stat( and openat(? How can I repro locally?

manojgupta added inline comments.Sep 26 2020, 10:57 AM
clang/lib/Driver/ToolChains/Gnu.cpp
1949

Since these are class fields, please initialize these to false in beginning of the function. Otherwise, it might be tempting to use them elsewhere where they may not be initialized.

MaskRay added a comment.Sep 26 2020, 4:59 PM
Without the patch

% strace -fc -e file /tmp/RelA/bin/clang '-###' a.cc
...
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 74.57    0.002809           8       331       312 openat
 13.83    0.000521           5        91        46 stat
 10.01    0.000377           6        58        47 access
  0.96    0.000036           7         5           readlink
  0.50    0.000019          19         1           unlink
  0.13    0.000005           1         5           lstat
  0.00    0.000000           0         1           execve
------ ----------- ----------- --------- --------- ----------------
100.00    0.003767                   492       405 total

With the patch

% strace -fc -e file /tmp/RelA/bin/clang '-###' a.cc
...
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 59.13    0.002345           9       239       220 openat
 21.66    0.000859           8        97        50 stat
 15.08    0.000598          10        58        47 access
  1.82    0.000072          14         5           readlink
  1.08    0.000043          43         1           execve
  0.73    0.000029          29         1           unlink
  0.50    0.000020           4         5           lstat
------ ----------- ----------- --------- --------- ----------------
100.00    0.003966                   406       317 total

A cross compile gets improved, too (strace -fc -e file /tmp/RelA/bin/clang++ -target powerpc64le-linux-gnu -isystem /usr/powerpc64le-linux-gnu/include/c++/9/powerpc64le-linux-gnu/ a.cc): 438 openat calls -> 414.

MaskRay added inline comments.Sep 26 2020, 5:05 PM
clang/lib/Driver/ToolChains/Gnu.cpp
1964

Its use of GCCDirExists is uninitialized. I suggest that you set GCCDirExists and GCCCrossDirExists to be conservative.

2469

Clang is installed alongside with GCC

This is not correct. (1) clang does not need to be installed (it can be used in the build directory) (2) You can set --prefix (-B) and --sysroot to affect detected prefixes. Clang does not need to be beside GCC.

dmantipov added a comment.Sep 28 2020, 12:57 AM
In D87901#2296392, @aganea wrote:

Thanks for the patch! I'll let others review it, but I was just being curious: what tool do you use for intercepting & printing stat( and openat(? How can I repro locally?

man strace :-) If you're on Windows, the closest match is https://docs.microsoft.com/en-us/sysinternals/downloads/procmon.

dmantipov added a comment.Sep 28 2020, 1:10 AM

@MaskRay Sure clang does not need to be installed and does not need to be beside GCC. But usually it is, and IMO this is the convenient setup for the most users who are not involved in development of clang itself and probably rely on tools installed as OS vendor's defaults. On my Fedora 32 system, I have /usr/bin/g++ and /usr/bin/clang++ (commonly configured with prefix /usr), clang will look for GCC installation in /usr/lib/gcc/x86_64-redhat-linux, and so.

dmantipov updated this revision to Diff 294625.Sep 28 2020, 1:42 AM

Initialize GCCDirExists and GCCCrossDirExists before calling ScanLibDirForGCCTriple().

Harbormaster completed remote builds in B73130: Diff 294625.Sep 28 2020, 2:14 AM
MaskRay added inline comments.Sep 28 2020, 10:25 AM
clang/lib/Driver/ToolChains/Gnu.cpp
2469

My point is about the accuracy of the comment. The choice "gcc/" + CandidateTriple.str() is unrelated to where Clang is installed.

MaskRay added inline comments.Sep 28 2020, 10:28 AM
clang/lib/Driver/ToolChains/Gnu.cpp
1964

You may still GCCDirExists = GCCCrossDirExists = true here

If they are set to false by CandidateLibDirs, you don't want them to suppress the detection for CandidateBiarchLibDirs.

This probably suggests that the variables should not be member variables.

dmantipov updated this revision to Diff 294873.Sep 28 2020, 8:16 PM

Prefer locals and function parameters to class members.

dmantipov added a comment.Sep 28 2020, 8:20 PM

Thanks @MaskRay for the method, some of my numbers are shown below.

Before:

# strace -fc -e file /home/antipov/.local/llvm-12.0.0/bin/clang++ test.cc 
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
100.00    0.004000          12       333       254 openat
  0.00    0.000000           0        60           open
  0.00    0.000000           0       120        78 stat
  0.00    0.000000           0         8           lstat
  0.00    0.000000           0        68        53 access
  0.00    0.000000           0         3           execve
  0.00    0.000000           0         1           rename
  0.00    0.000000           0         4           unlink
  0.00    0.000000           0         7           readlink
  0.00    0.000000           0         1           chmod
------ ----------- ----------- --------- --------- ----------------
100.00    0.004000           6       605       385 total

# strace -fc -e file /home/antipov/.local/llvm-12.0.0/bin/clang++ -target mips-img-linux-gnu --gcc-toolchain=/home/antipov/.local/mips-img-linux-gnu/2017.10-05 --sysroot=/home/antipov/.local/mips-img-linux-gnu/2017.10-05/sysroot/mips-r6-hard test.cc 
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
  0.00    0.000000           0        60           open
  0.00    0.000000           0       125        76 stat
  0.00    0.000000           0        93           lstat
  0.00    0.000000           0        72        56 access
  0.00    0.000000           0         3           execve
  0.00    0.000000           0         1           rename
  0.00    0.000000           0         4           unlink
  0.00    0.000000           0         7           readlink
  0.00    0.000000           0         1           chmod
  0.00    0.000000           0       234       157 openat
------ ----------- ----------- --------- --------- ----------------
100.00    0.000000           0       600       289 total

After:

# strace -fc -e file /home/antipov/.local/llvm-12.0.0/bin/clang++ test.cc 
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
  0.00    0.000000           0        60           open
  0.00    0.000000           0       128        84 stat
  0.00    0.000000           0         8           lstat
  0.00    0.000000           0        68        53 access
  0.00    0.000000           0         3           execve
  0.00    0.000000           0         1           rename
  0.00    0.000000           0         4           unlink
  0.00    0.000000           0         7           readlink
  0.00    0.000000           0         1           chmod
  0.00    0.000000           0       245       166 openat
------ ----------- ----------- --------- --------- ----------------
100.00    0.000000           0       525       303 total

# strace -fc -e file /home/antipov/.local/llvm-12.0.0/bin/clang++ -target mips-img-linux-gnu --gcc-toolchain=/home/antipov/.local/mips-img-linux-gnu/2017.10-05 --sysroot=/home/antipov/.local/mips-img-linux-gnu/2017.10-05/sysroot/mips-r6-hard test.cc 
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
  0.00    0.000000           0        60           open
  0.00    0.000000           0       131        80 stat
  0.00    0.000000           0        93           lstat
  0.00    0.000000           0        72        56 access
  0.00    0.000000           0         3           execve
  0.00    0.000000           0         1           rename
  0.00    0.000000           0         4           unlink
  0.00    0.000000           0         7           readlink
  0.00    0.000000           0         1           chmod
  0.00    0.000000           0       200       123 openat
------ ----------- ----------- --------- --------- ----------------
100.00    0.000000           0       572       259 total
Harbormaster completed remote builds in B73276: Diff 294873.Sep 28 2020, 8:29 PM
MaskRay accepted this revision.Sep 28 2020, 8:37 PM

For my installation configured with -DCMAKE_INSTALL_PREFIX=/home/antipov/.local/llvm-12.0.0, it's possible to filter out 80 of 200 VFS lookups, from:

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This revision is now accepted and ready to land.Sep 28 2020, 8:37 PM
This revision was landed with ongoing or failed builds.Sep 28 2020, 11:19 PM
Closed by commit rGbc868da0e77a: [Driver] Filter out <libdir>/gcc and <libdir>/gcc-cross if they do not exists (authored by dmantipov). · Explain Why
This revision was automatically updated to reflect the committed changes.
dmantipov added a commit: rGbc868da0e77a: [Driver] Filter out <libdir>/gcc and <libdir>/gcc-cross if they do not exists.

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clang/
lib/
Driver/
ToolChains/
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12 lines

Diff 292773

clang/lib/Driver/ToolChains/Gnu.h

Show First 20 Lines • Show All 206 Lines • ▼ Show 20 Lines class GCCInstallationDetector {
// We retain the list of install paths that were considered and rejected in // We retain the list of install paths that were considered and rejected in
// order to print out detailed information in verbose mode. // order to print out detailed information in verbose mode.
std::set<std::string> CandidateGCCInstallPaths; std::set<std::string> CandidateGCCInstallPaths;
/// The set of multilibs that the detected installation supports. /// The set of multilibs that the detected installation supports.
MultilibSet Multilibs; MultilibSet Multilibs;
// Internal flags used to filter out <libdir>/gcc and <libdir>/gcc-cross.
bool HasGCCDir;
bool HasGCCCrossDir;
public: public:
explicit GCCInstallationDetector(const Driver &D) : IsValid(false), D(D) {} explicit GCCInstallationDetector(const Driver &D) : IsValid(false), D(D) {}
void init(const llvm::Triple &TargetTriple, const llvm::opt::ArgList &Args, void init(const llvm::Triple &TargetTriple, const llvm::opt::ArgList &Args,
ArrayRef<std::string> ExtraTripleAliases = None); ArrayRef<std::string> ExtraTripleAliases = None);
/// Check whether we detected a valid GCC install. /// Check whether we detected a valid GCC install.
bool isValid() const { return IsValid; } bool isValid() const { return IsValid; }
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clang/lib/Driver/ToolChains/Gnu.cpp

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Version = GCCVersion::Parse("0.0.0"); Version = GCCVersion::Parse("0.0.0");
for (const std::string &Prefix : Prefixes) { for (const std::string &Prefix : Prefixes) {
if (!D.getVFS().exists(Prefix)) if (!D.getVFS().exists(Prefix))
continue; continue;
for (StringRef Suffix : CandidateLibDirs) { for (StringRef Suffix : CandidateLibDirs) {
const std::string LibDir = Prefix + Suffix.str(); const std::string LibDir = Prefix + Suffix.str();
if (!D.getVFS().exists(LibDir)) if (!D.getVFS().exists(LibDir))
continue; continue;
// Maybe filter out <libdir>/gcc and <libdir>/gcc-cross.
HasGCCDir = D.getVFS().exists(LibDir + "/gcc");
manojguptaUnsubmitted
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Since these are class fields, please initialize these to false in beginning of the function. Otherwise, it might be tempting to use them elsewhere where they may not be initialized.

manojgupta: Since these are class fields, please initialize these to false in beginning of the function.
HasGCCCrossDir = D.getVFS().exists(LibDir + "/gcc-cross");
// Try to match the exact target triple first. // Try to match the exact target triple first.
ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str()); ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str());
// Try rest of possible triples. // Try rest of possible triples.
for (StringRef Candidate : ExtraTripleAliases) // Try these first. for (StringRef Candidate : ExtraTripleAliases) // Try these first.
ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate); ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
for (StringRef Candidate : CandidateTripleAliases) for (StringRef Candidate : CandidateTripleAliases)
ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate); ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
} }
for (StringRef Suffix : CandidateBiarchLibDirs) { for (StringRef Suffix : CandidateBiarchLibDirs) {
const std::string LibDir = Prefix + Suffix.str(); const std::string LibDir = Prefix + Suffix.str();
if (!D.getVFS().exists(LibDir)) if (!D.getVFS().exists(LibDir))
continue; continue;
for (StringRef Candidate : CandidateBiarchTripleAliases) for (StringRef Candidate : CandidateBiarchTripleAliases)
ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate, ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
MaskRayUnsubmitted
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Its use of GCCDirExists is uninitialized. I suggest that you set GCCDirExists and GCCCrossDirExists to be conservative.

MaskRay: Its use of GCCDirExists is uninitialized. I suggest that you set GCCDirExists and…
MaskRayUnsubmitted
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You may still GCCDirExists = GCCCrossDirExists = true here

If they are set to false by CandidateLibDirs, you don't want them to suppress the detection for CandidateBiarchLibDirs.

This probably suggests that the variables should not be member variables.

MaskRay: You may still GCCDirExists = GCCCrossDirExists = true here If they are set to false by…
/*NeedsBiarchSuffix=*/ true); /*NeedsBiarchSuffix=*/ true);
} }
} }
} }
void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const { void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
for (const auto &InstallPath : CandidateGCCInstallPaths) for (const auto &InstallPath : CandidateGCCInstallPaths)
OS << "Found candidate GCC installation: " << InstallPath << "\n"; OS << "Found candidate GCC installation: " << InstallPath << "\n";
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// Path from system lib directory to GCC triple-specific directory. // Path from system lib directory to GCC triple-specific directory.
std::string LibSuffix; std::string LibSuffix;
// Path from GCC triple-specific directory back to system lib directory. // Path from GCC triple-specific directory back to system lib directory.
// This is one '..' component per component in LibSuffix. // This is one '..' component per component in LibSuffix.
StringRef ReversePath; StringRef ReversePath;
// Whether this library suffix is relevant for the triple. // Whether this library suffix is relevant for the triple.
bool Active; bool Active;
} Suffixes[] = { } Suffixes[] = {
// This is the normal place. // This is the normal place if Clang is installed alongside with GCC,
MaskRayUnsubmitted
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Clang is installed alongside with GCC

This is not correct. (1) clang does not need to be installed (it can be used in the build directory) (2) You can set --prefix (-B) and --sysroot to affect detected prefixes. Clang does not need to be beside GCC.

MaskRay: > Clang is installed alongside with GCC This is not correct. (1) clang does not need to be…
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My point is about the accuracy of the comment. The choice "gcc/" + CandidateTriple.str() is unrelated to where Clang is installed.

MaskRay: My point is about the accuracy of the comment. The choice `"gcc/" + CandidateTriple.str()` is…
{"gcc/" + CandidateTriple.str(), "../..", true}, // probably with the same prefix. But it's likely does not exists in
// case of standalone Clang install.
{"gcc/" + CandidateTriple.str(), "../..", HasGCCDir},
// Debian puts cross-compilers in gcc-cross. // Debian puts cross-compilers in gcc-cross.
{"gcc-cross/" + CandidateTriple.str(), "../..", {"gcc-cross/" + CandidateTriple.str(), "../..", HasGCCCrossDir},
TargetTriple.getOS() != llvm::Triple::Solaris},
// The Freescale PPC SDK has the gcc libraries in // The Freescale PPC SDK has the gcc libraries in
// <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
// this on Freescale triples, though, since some systems put a *lot* of // this on Freescale triples, though, since some systems put a *lot* of
// files in that location, not just GCC installation data. // files in that location, not just GCC installation data.
{CandidateTriple.str(), "..", {CandidateTriple.str(), "..",
TargetTriple.getVendor() == llvm::Triple::Freescale || TargetTriple.getVendor() == llvm::Triple::Freescale ||
TargetTriple.getVendor() == llvm::Triple::OpenEmbedded}, TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
Lint: Pre-merge checks
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clang-format: please reformat the code

-       TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
+           TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
Lint: Pre-merge checks: clang-format: please reformat the code ``` - TargetTriple.getVendor() == llvm::Triple…
// Natively multiarch systems sometimes put the GCC triple-specific // Natively multiarch systems sometimes put the GCC triple-specific
// directory within their multiarch lib directory, resulting in the // directory within their multiarch lib directory, resulting in the
// triple appearing twice. // triple appearing twice.
{CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..", {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..",
TargetTriple.getOS() != llvm::Triple::Solaris}, TargetTriple.getOS() != llvm::Triple::Solaris},
// Deal with cases (on Ubuntu) where the system architecture could be i386 // Deal with cases (on Ubuntu) where the system architecture could be i386
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