clang/test: Remove platform-linker feature

[thakis]

Summary

By explicitly requesting the system linker with -fuse-ld=, the
tests are able to CHECK for the system linker even with
CLANG_DEFAULT_LINKER=lld.

Alternative to D74704.

[serge-sans-paille]

If that's okay with @leonardchan in terms of RISCV validation, I'm fine with that one. Any branch removed is less path to cover!

[leonardchan]

@phosek This shouldn't affect supporting riscv with our toolchain, right?

[phosek]

In D92291#2423417, @leonardchan wrote:

@phosek This shouldn't affect supporting riscv with our toolchain, right?

Yes, it shouldn't have any impact.

[vvereschaka]

LGTM

clang/test/Driver/riscv32-toolchain-extra.c

 // A basic clang -cc1 command-line, and simple environment check.
 
 // The tests here are similar to those in riscv32-toolchain.c, however
 // these tests need to create symlinks to test directory trees in order to
 // set up the environment and therefore shell support is required.
 // REQUIRES: shell, riscv-registered-target
 // UNSUPPORTED: system-windows
 
 // If there is no GCC install detected then the driver searches for executables
 // and runtime starting from the directory tree above the driver itself.
 // The test below checks that the driver correctly finds the linker and
 // runtime if and only if they exist.
 //
-// REQUIRES: platform-linker
 // RUN: rm -rf %T/testroot-riscv32-baremetal-nogcc
 // RUN: mkdir -p %T/testroot-riscv32-baremetal-nogcc/bin
 // RUN: ln -s %clang %T/testroot-riscv32-baremetal-nogcc/bin/clang
 // RUN: ln -s %S/Inputs/basic_riscv32_nogcc_tree/bin/riscv32-unknown-elf-ld %T/testroot-riscv32-baremetal-nogcc/bin/riscv32-unknown-elf-ld
 // RUN: ln -s %S/Inputs/basic_riscv32_nogcc_tree/riscv32-unknown-elf %T/testroot-riscv32-baremetal-nogcc/riscv32-unknown-elf
 // RUN: %T/testroot-riscv32-baremetal-nogcc/bin/clang %s -### -no-canonical-prefixes \
 // RUN:    --gcc-toolchain=%T/testroot-riscv32-baremetal-nogcc/invalid \
-// RUN:    -target riscv32-unknown-elf --rtlib=platform 2>&1 \
+// RUN:    -target riscv32-unknown-elf --rtlib=platform -fuse-ld= 2>&1 \
 // RUN:    | FileCheck -check-prefix=C-RV32-BAREMETAL-ILP32-NOGCC %s
 
 // RUN: %T/testroot-riscv32-baremetal-nogcc/bin/clang %s -### -no-canonical-prefixes \
-// RUN:    -target riscv32-unknown-elf --rtlib=platform 2>&1 \
+// RUN:    -target riscv32-unknown-elf --rtlib=platform -fuse-ld= 2>&1 \
 // RUN:    | FileCheck -check-prefix=C-RV32-BAREMETAL-ILP32-NOGCC %s
 
 // C-RV32-BAREMETAL-ILP32-NOGCC: "-internal-isystem" "{{.*}}Output/testroot-riscv32-baremetal-nogcc/bin/../riscv32-unknown-elf/include"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "{{.*}}Output/testroot-riscv32-baremetal-nogcc/bin/riscv32-unknown-elf-ld"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "{{.*}}Output/testroot-riscv32-baremetal-nogcc/bin/../riscv32-unknown-elf/lib/crt0.o"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "{{.*}}Output/testroot-riscv32-baremetal-nogcc/{{.*}}/lib/clang_rt.crtbegin-riscv32.o"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "{{.*}}Output/testroot-riscv32-baremetal-nogcc/bin/../riscv32-unknown-elf/lib"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "--start-group" "-lc" "-lgloss" "--end-group"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "{{.*}}Output/testroot-riscv32-baremetal-nogcc/{{.*}}/lib/libclang_rt.builtins-riscv32.a"
 // C-RV32-BAREMETAL-ILP32-NOGCC: "{{.*}}Output/testroot-riscv32-baremetal-nogcc/{{.*}}/lib/clang_rt.crtend-riscv32.o"

clang/test/Driver/riscv32-toolchain.c

 // A basic clang -cc1 command-line, and simple environment check.
-// REQUIRES: platform-linker
 
 // RUN: %clang %s -### -no-canonical-prefixes -target riscv32 \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv32_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=CC1 %s
 // CC1: clang{{.*}} "-cc1" "-triple" "riscv32"
 
 // Test interaction with -fuse-ld=lld, if lld is available.
 // RUN: %clang %s -### -no-canonical-prefixes -target riscv32 \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv32_tree -fuse-ld=lld 2>&1 \
 // RUN:   | FileCheck -check-prefix=LLD %s
 // LLD: {{(error: invalid linker name in argument '-fuse-ld=lld')|(ld.lld)}}
 
 // In the below tests, --rtlib=platform is used so that the driver ignores
 // the configure-time CLANG_DEFAULT_RTLIB option when choosing the runtime lib
 
-// RUN: %clang %s -### -no-canonical-prefixes \
+// RUN: %clang %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv32-unknown-elf --rtlib=platform \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv32_tree \
 // RUN:   --sysroot=%S/Inputs/basic_riscv32_tree/riscv32-unknown-elf 2>&1 \
 // RUN:   | FileCheck -check-prefix=C-RV32-BAREMETAL-ILP32 %s
 
 // C-RV32-BAREMETAL-ILP32: "{{.*}}Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv32-unknown-elf-ld"
 // C-RV32-BAREMETAL-ILP32: "--sysroot={{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf"
 // C-RV32-BAREMETAL-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf/lib{{/|\\\\}}crt0.o"
 // C-RV32-BAREMETAL-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // C-RV32-BAREMETAL-ILP32: "-L{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1"
 // C-RV32-BAREMETAL-ILP32: "-L{{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf/lib"
 // C-RV32-BAREMETAL-ILP32: "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // C-RV32-BAREMETAL-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clang %s -### -no-canonical-prefixes \
+// RUN: %clang %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv32-unknown-elf --rtlib=platform \
 // RUN:   --sysroot= \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv32_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=C-RV32-BAREMETAL-NOSYSROOT-ILP32 %s
 
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "{{.*}}Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv32-unknown-elf-ld"
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv32-unknown-elf/lib{{/|\\\\}}crt0.o"
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "-L{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1"
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "-L{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv32-unknown-elf{{/|\\\\}}lib"
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // C-RV32-BAREMETAL-NOSYSROOT-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clangxx %s -### -no-canonical-prefixes \
+// RUN: %clangxx %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv32-unknown-elf -stdlib=libstdc++ --rtlib=platform \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv32_tree \
 // RUN:   --sysroot=%S/Inputs/basic_riscv32_tree/riscv32-unknown-elf 2>&1 \
 // RUN:   | FileCheck -check-prefix=CXX-RV32-BAREMETAL-ILP32 %s
 
 // CXX-RV32-BAREMETAL-ILP32: "-internal-isystem" "{{.*}}Inputs/basic_riscv32_tree/riscv32-unknown-elf/include/c++{{/|\\\\}}8.0.1"
 // CXX-RV32-BAREMETAL-ILP32: "{{.*}}Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv32-unknown-elf-ld"
 // CXX-RV32-BAREMETAL-ILP32: "--sysroot={{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf"
 // CXX-RV32-BAREMETAL-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf/lib{{/|\\\\}}crt0.o"
 // CXX-RV32-BAREMETAL-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // CXX-RV32-BAREMETAL-ILP32: "-L{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1"
 // CXX-RV32-BAREMETAL-ILP32: "-L{{.*}}/Inputs/basic_riscv32_tree/riscv32-unknown-elf/lib"
 // CXX-RV32-BAREMETAL-ILP32: "-lstdc++" "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // CXX-RV32-BAREMETAL-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clangxx %s -### -no-canonical-prefixes \
+// RUN: %clangxx %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv32-unknown-elf -stdlib=libstdc++ --rtlib=platform \
 // RUN:   --sysroot= \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv32_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=CXX-RV32-BAREMETAL-NOSYSROOT-ILP32 %s
 
 // CXX-RV32-BAREMETAL-NOSYSROOT-ILP32: "-internal-isystem" "{{.*}}Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv32-unknown-elf/include/c++{{/|\\\\}}8.0.1"
 // CXX-RV32-BAREMETAL-NOSYSROOT-ILP32: "{{.*}}Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv32-unknown-elf-ld"
 // CXX-RV32-BAREMETAL-NOSYSROOT-ILP32: "{{.*}}/Inputs/basic_riscv32_tree/lib/gcc/riscv32-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv32-unknown-elf/lib{{/|\\\\}}crt0.o"

clang/test/Driver/riscv64-toolchain-extra.c

 // A basic clang -cc1 command-line, and simple environment check.
 
 // The tests here are similar to those in riscv64-toolchain.c, however
 // these tests need to create symlinks to test directory trees in order to
 // set up the environment and therefore shell support is required.
 // REQUIRES: shell, riscv-registered-target
 // UNSUPPORTED: system-windows
 
 // If there is no GCC install detected then the driver searches for executables
 // and runtime starting from the directory tree above the driver itself.
 // The test below checks that the driver correctly finds the linker and
 // runtime if and only if they exist.
 //
-// REQUIRES: platform-linker
 // RUN: rm -rf %T/testroot-riscv64-baremetal-nogcc
 // RUN: mkdir -p %T/testroot-riscv64-baremetal-nogcc/bin
 // RUN: ln -s %clang %T/testroot-riscv64-baremetal-nogcc/bin/clang
 // RUN: ln -s %S/Inputs/basic_riscv64_nogcc_tree/bin/riscv64-unknown-elf-ld %T/testroot-riscv64-baremetal-nogcc/bin/riscv64-unknown-elf-ld
 // RUN: ln -s %S/Inputs/basic_riscv64_nogcc_tree/riscv64-unknown-elf %T/testroot-riscv64-baremetal-nogcc/riscv64-unknown-elf
 // RUN: %T/testroot-riscv64-baremetal-nogcc/bin/clang %s -### -no-canonical-prefixes \
 // RUN:    --gcc-toolchain=%T/testroot-riscv64-baremetal-nogcc/invalid \
-// RUN:    -target riscv64-unknown-elf --rtlib=platform 2>&1 \
+// RUN:    -target riscv64-unknown-elf --rtlib=platform -fuse-ld= 2>&1 \
 // RUN:    | FileCheck -check-prefix=C-RV64-BAREMETAL-LP64-NOGCC %s
 
 // RUN: %T/testroot-riscv64-baremetal-nogcc/bin/clang %s -### -no-canonical-prefixes \
-// RUN:    -target riscv64-unknown-elf --rtlib=platform 2>&1 \
+// RUN:    -target riscv64-unknown-elf --rtlib=platform -fuse-ld= 2>&1 \
 // RUN:    | FileCheck -check-prefix=C-RV64-BAREMETAL-LP64-NOGCC %s
 
 // C-RV64-BAREMETAL-LP64-NOGCC: "-internal-isystem" "{{.*}}Output/testroot-riscv64-baremetal-nogcc/bin/../riscv64-unknown-elf/include"
 // C-RV64-BAREMETAL-LP64-NOGCC: "{{.*}}Output/testroot-riscv64-baremetal-nogcc/bin/riscv64-unknown-elf-ld"
 // C-RV64-BAREMETAL-LP64-NOGCC: "{{.*}}Output/testroot-riscv64-baremetal-nogcc/bin/../riscv64-unknown-elf/lib/crt0.o"
 // C-RV64-BAREMETAL-LP64-NOGCC: "{{.*}}Output/testroot-riscv64-baremetal-nogcc/{{.*}}/lib/clang_rt.crtbegin-riscv64.o"
 // C-RV64-BAREMETAL-LP64-NOGCC: "{{.*}}Output/testroot-riscv64-baremetal-nogcc/bin/../riscv64-unknown-elf/lib"
 // C-RV64-BAREMETAL-LP64-NOGCC: "--start-group" "-lc" "-lgloss" "--end-group"
 // C-RV64-BAREMETAL-LP64-NOGCC: "{{.*}}Output/testroot-riscv64-baremetal-nogcc/{{.*}}/lib/libclang_rt.builtins-riscv64.a"
 // C-RV64-BAREMETAL-LP64-NOGCC: "{{.*}}Output/testroot-riscv64-baremetal-nogcc/{{.*}}/lib/clang_rt.crtend-riscv64.o"

clang/test/Driver/riscv64-toolchain.c

 // A basic clang -cc1 command-line, and simple environment check.
-// REQUIRES: platform-linker
 
 // RUN: %clang %s -### -no-canonical-prefixes -target riscv64 \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv64_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=CC1 %s
 // CC1: clang{{.*}} "-cc1" "-triple" "riscv64"
 
 // Test interaction with -fuse-ld=lld, if lld is available.
 // RUN: %clang %s -### -no-canonical-prefixes -target riscv32 -fuse-ld=lld \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv64_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=LLD %s
 // LLD: {{(error: invalid linker name in argument '-fuse-ld=lld')|(ld.lld)}}
 
 // In the below tests, --rtlib=platform is used so that the driver ignores
 // the configure-time CLANG_DEFAULT_RTLIB option when choosing the runtime lib
 
-// RUN: %clang %s -### -no-canonical-prefixes \
+// RUN: %clang %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv64-unknown-elf --rtlib=platform \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv64_tree \
 // RUN:   --sysroot=%S/Inputs/basic_riscv64_tree/riscv64-unknown-elf 2>&1 \
 // RUN:   | FileCheck -check-prefix=C-RV64-BAREMETAL-LP64 %s
 
 // C-RV64-BAREMETAL-LP64: "{{.*}}Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv64-unknown-elf-ld"
 // C-RV64-BAREMETAL-LP64: "--sysroot={{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf"
 // C-RV64-BAREMETAL-LP64: "{{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf/lib{{/|\\\\}}crt0.o"
 // C-RV64-BAREMETAL-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // C-RV64-BAREMETAL-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1"
 // C-RV64-BAREMETAL-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf/lib"
 // C-RV64-BAREMETAL-LP64: "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // C-RV64-BAREMETAL-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clang %s -### -no-canonical-prefixes \
+// RUN: %clang %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv64-unknown-elf --rtlib=platform \
 // RUN:   --sysroot= \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv64_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=C-RV64-BAREMETAL-NOSYSROOT-LP64 %s
 
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv64-unknown-elf-ld"
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv64-unknown-elf/lib{{/|\\\\}}crt0.o"
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1"
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv64-unknown-elf{{/|\\\\}}lib"
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // C-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clangxx %s -### -no-canonical-prefixes \
+// RUN: %clangxx %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv64-unknown-elf -stdlib=libstdc++ --rtlib=platform \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv64_tree \
 // RUN:   --sysroot=%S/Inputs/basic_riscv64_tree/riscv64-unknown-elf 2>&1 \
 // RUN:   | FileCheck -check-prefix=CXX-RV64-BAREMETAL-LP64 %s
 
 // CXX-RV64-BAREMETAL-LP64: "-internal-isystem" "{{.*}}Inputs/basic_riscv64_tree/riscv64-unknown-elf/include/c++{{/|\\\\}}8.0.1"
 // CXX-RV64-BAREMETAL-LP64: "{{.*}}Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv64-unknown-elf-ld"
 // CXX-RV64-BAREMETAL-LP64: "--sysroot={{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf"
 // CXX-RV64-BAREMETAL-LP64: "{{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf/lib{{/|\\\\}}crt0.o"
 // CXX-RV64-BAREMETAL-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // CXX-RV64-BAREMETAL-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1"
 // CXX-RV64-BAREMETAL-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/riscv64-unknown-elf/lib"
 // CXX-RV64-BAREMETAL-LP64: "-lstdc++" "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // CXX-RV64-BAREMETAL-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clangxx %s -### -no-canonical-prefixes \
+// RUN: %clangxx %s -### -no-canonical-prefixes -fuse-ld= \
 // RUN:   -target riscv64-unknown-elf -stdlib=libstdc++ --rtlib=platform \
 // RUN:   --sysroot= \
 // RUN:   --gcc-toolchain=%S/Inputs/basic_riscv64_tree 2>&1 \
 // RUN:   | FileCheck -check-prefix=CXX-RV64-BAREMETAL-NOSYSROOT-LP64 %s
 
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "-internal-isystem" "{{.*}}Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv64-unknown-elf/include/c++{{/|\\\\}}8.0.1"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}bin{{/|\\\\}}riscv64-unknown-elf-ld"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv64-unknown-elf/lib{{/|\\\\}}crt0.o"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtbegin.o"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "-L{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1/../../..{{/|\\\\}}..{{/|\\\\}}riscv64-unknown-elf/lib"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "-lstdc++" "--start-group" "-lc" "-lgloss" "--end-group" "-lgcc"
 // CXX-RV64-BAREMETAL-NOSYSROOT-LP64: "{{.*}}/Inputs/basic_riscv64_tree/lib/gcc/riscv64-unknown-elf/8.0.1{{/|\\\\}}crtend.o"
 
-// RUN: %clang %s -### -no-canonical-prefixes -fuse-ld=ld \
+// RUN: %clang %s -### -no-canonical-prefixes -fuse-ld=ld -fuse-ld= \
 // RUN:   -target riscv64-unknown-linux-gnu --rtlib=platform -mabi=lp64 \
 // RUN:   --gcc-toolchain=%S/Inputs/multilib_riscv_linux_sdk \
 // RUN:   --sysroot=%S/Inputs/multilib_riscv_linux_sdk/sysroot 2>&1 \
 // RUN:   | FileCheck -check-prefix=C-RV64-LINUX-MULTI-LP64 %s
 
 // C-RV64-LINUX-MULTI-LP64: "{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/../../..{{/|\\\\}}..{{/|\\\\}}riscv64-unknown-linux-gnu/bin{{/|\\\\}}ld"
 // C-RV64-LINUX-MULTI-LP64: "--sysroot={{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot"
 // C-RV64-LINUX-MULTI-LP64: "-m" "elf64lriscv"

clang/test/lit.site.cfg.py.in

 except KeyError:
     e = sys.exc_info()[1]
     key, = e.args
     lit_config.fatal("unable to find %r parameter, use '--param=%s=VALUE'" % (key,key))
 
 import lit.llvm
 lit.llvm.initialize(lit_config, config)
 
-if not "@CLANG_DEFAULT_LINKER@":
-    config.available_features.add('platform-linker')
-
 # Let the main config do the real work.
 lit_config.load_config(
     config, os.path.join(config.clang_src_dir, "test/lit.cfg.py"))

llvm/utils/gn/secondary/clang/test/BUILD.gn

write_lit_config("lit_site_cfg") {
   # Fully-qualified instead of relative for LIT_SITE_CFG_IN_HEADER.
   input = "//clang/test/lit.site.cfg.py.in"
   output = clang_lit_site_cfg_file
   dir = get_path_info(output, "dir")
   extra_values = [
     "LLVM_WITH_Z3=",  # Must be empty, not 0.
     "CLANG_BUILD_EXAMPLES=0",
     "CLANG_DEFAULT_CXX_STDLIB=",  # Empty string means "default value" here.
-    "CLANG_DEFAULT_LINKER=",
     "CLANG_TOOLS_DIR=" + rebase_path("$root_out_dir/bin", dir),
     "CLANG_VENDOR_UTI=org.llvm.clang",
 
     # This is only used if LLVM_USE_SANITIZER includes lsan and the host
     # OS is macOS. Since the GN build currently never uses LLVM_USE_SANITIZER,
     # this is never read.  If it's ever needed,
     # utils/gn/build/toolchain/BUILD.gn should get the compiler from a variable
     # that's also read here -- but that should happen after multi-toolchain