Add OpenBSD support in lib/tsan/go/buildgo.sh

[qbit]

Summary

Enable OpenBSD support in buildgo.sh.

With the race_debug_openbsd_amd64.syso file created via this diff, Go's race detector is able to detect a race in the example code from this link: https://golang.org/doc/articles/race_detector.html

[thakis]

stamp

[krytarowski]

It looks fine to me, but I will defer it to @dvyukov

Please use clang-format.

[qbit]

In D80469#2061054, @krytarowski wrote:

It looks fine to me, but I will defer it to @dvyukov

Please use clang-format.

I wasn't sure about using clang-format, it changes a lot of stuff that isn't part of this initial diff - is that OK?

[kernigh]

@qbit, if you use git clang-format, it should format only the code around your diff (https://llvm.org/docs/Contributing.html#how-to-submit-a-patch). On OpenBSD, pkg_add llvm installs clang-format.

[qbit]

ran clang-format - thanks for the pointer!

[qbit]

Is anything else needed from me?

[dvyukov]

Landed in https://github.com/llvm/llvm-project/commit/fcf6ae2f070eba73074b6ec8d8281e54d29dbeeb
Thanks.

compiler-rt/lib/tsan/go/buildgo.sh

SRCS="
     ../../sanitizer_common/sanitizer_procmaps_bsd.cpp
     ../../sanitizer_common/sanitizer_procmaps_common.cpp
     ../../sanitizer_common/sanitizer_linux.cpp
     ../../sanitizer_common/sanitizer_linux_libcdep.cpp
     ../../sanitizer_common/sanitizer_netbsd.cpp
     ../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
     ../../sanitizer_common/sanitizer_stoptheworld_netbsd_libcdep.cpp
   "
+elif [ "`uname -a | grep OpenBSD`" != "" ]; then
+  # The resulting object still depends on libc.
+  # We removed this dependency for Go runtime for other OSes,
+  # and we should remove it for OpenBSD as well, but there is no pressing need.
+  DEPENDS_ON_LIBC=1
+  SUFFIX="openbsd_amd64"
+  OSCFLAGS="-fno-strict-aliasing -fPIC -Werror"
+  ARCHCFLAGS="-m64"
+  OSLDFLAGS="-pthread -fPIC -fpie"
+  SRCS="
+    $SRCS
+    ../rtl/tsan_platform_linux.cpp
+    ../../sanitizer_common/sanitizer_posix.cpp
+    ../../sanitizer_common/sanitizer_posix_libcdep.cpp
+    ../../sanitizer_common/sanitizer_procmaps_bsd.cpp
+    ../../sanitizer_common/sanitizer_procmaps_common.cpp
+    ../../sanitizer_common/sanitizer_linux.cpp
+    ../../sanitizer_common/sanitizer_linux_libcdep.cpp
+    ../../sanitizer_common/sanitizer_openbsd.cpp
+    ../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
+  "
 elif [ "`uname -a | grep Darwin`" != "" ]; then
   SUFFIX="darwin_amd64"
   OSCFLAGS="-fPIC -Wno-unused-const-variable -Wno-unknown-warning-option -mmacosx-version-min=10.7"
   ARCHCFLAGS="-m64"
   OSLDFLAGS="-lpthread -fPIC -fpie -mmacosx-version-min=10.7"
   SRCS="
     $SRCS
     ../rtl/tsan_platform_mac.cpp

compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp

 //===-- tsan_platform_linux.cpp -------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of ThreadSanitizer (TSan), a race detector.
 //
-// Linux- and FreeBSD-specific code.
+// Linux- and BSD-specific code.
 //===----------------------------------------------------------------------===//
 
-
 #include "sanitizer_common/sanitizer_platform.h"
-#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD
+#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
+    SANITIZER_OPENBSD
 
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_linux.h"
 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
+#include "sanitizer_common/sanitizer_platform_limits_openbsd.h"
 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
 #include "sanitizer_common/sanitizer_posix.h"
 #include "sanitizer_common/sanitizer_procmaps.h"
-#include "sanitizer_common/sanitizer_stoptheworld.h"
 #include "sanitizer_common/sanitizer_stackdepot.h"
+#include "sanitizer_common/sanitizer_stoptheworld.h"
+#include "tsan_flags.h"
 #include "tsan_platform.h"
 #include "tsan_rtl.h"
-#include "tsan_flags.h"
 
 #include <fcntl.h>
 #include <pthread.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
void cur_thread_finalize() {
   }
   CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, &oldset, nullptr));
 }
 #endif  // SANITIZER_ANDROID
 #endif  // if !SANITIZER_GO
 
 }  // namespace __tsan
 
-#endif  // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD
+#endif  // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
+        // SANITIZER_OPENBSD