add tsan library

[ldionne]

Can you please provide an explanation of what this change does and why? It would be useful to reviewers that might not have all the context (like myself).

libcxx/utils/merge_archives.py

11

Why is this needed?

[ZijunZhao]

libcxx/utils/merge_archives.py

11

I used this for fixing fail to apply patch problem. This is out of date. The latest one should be
https://reviews.llvm.org/rGd2b43605c96ff5669653455fdfc06ec26876f436

compiler-rt/lib/tsan/CMakeLists.txt

 
 set(TSAN_RTL_CFLAGS ${TSAN_CFLAGS})
 append_list_if(COMPILER_RT_HAS_MSSE4_2_FLAG -msse4.2 TSAN_RTL_CFLAGS)
 append_list_if(SANITIZER_LIMIT_FRAME_SIZE -Wframe-larger-than=530
                TSAN_RTL_CFLAGS)
 append_list_if(COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG -Wglobal-constructors
                TSAN_RTL_CFLAGS)
 
+set(TSAN_RTL_DYNAMIC_CFLAGS ${TSAN_RTL_CFLAGS})
+list(REMOVE_ITEM TSAN_RTL_DYNAMIC_CFLAGS -fPIE)
+
+append_list_if(COMPILER_RT_HAS_LIBDL dl TSAN_DYNAMIC_LINK_LIBS)
+append_list_if(COMPILER_RT_HAS_LIBPTHREAD pthread TSAN_DYNAMIC_LINK_LIBS)
+
 set(TSAN_SOURCES
   rtl/tsan_clock.cpp
   rtl/tsan_debugging.cpp
   rtl/tsan_external.cpp
   rtl/tsan_fd.cpp
   rtl/tsan_flags.cpp
   rtl/tsan_ignoreset.cpp
   rtl/tsan_interceptors_posix.cpp
add_compiler_rt_runtime(clang_rt.tsan_cxx
       ARCHS ${arch}
       SOURCES ${TSAN_CXX_SOURCES}
               $<TARGET_OBJECTS:RTUbsan_cxx.${arch}>
       ADDITIONAL_HEADERS ${TSAN_HEADERS}
       CFLAGS ${TSAN_RTL_CFLAGS}
       PARENT_TARGET tsan)
     list(APPEND TSAN_RUNTIME_LIBRARIES clang_rt.tsan-${arch}
                                        clang_rt.tsan_cxx-${arch})
+    add_compiler_rt_runtime(clang_rt.tsan
+      SHARED
+      ARCHS ${arch}
+      SOURCES ${TSAN_SOURCES} ${TSAN_ASM_SOURCES}
+              $<TARGET_OBJECTS:RTInterception.${arch}>
+              $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
+              $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
+              $<TARGET_OBJECTS:RTSanitizerCommonCoverage.${arch}>
+              $<TARGET_OBJECTS:RTSanitizerCommonSymbolizer.${arch}>
+              $<TARGET_OBJECTS:RTUbsan.${arch}>
+      ADDITIONAL_HEADERS ${TSAN_HEADERS}
+      CFLAGS ${TSAN_RTL_DYNAMIC_CFLAGS}
+      LINK_LIBS ${TSAN_DYNAMIC_LINK_LIBS}
+      PARENT_TARGET tsan)
     add_sanitizer_rt_symbols(clang_rt.tsan
       ARCHS ${arch}
       EXTRA rtl/tsan.syms.extra)
     add_sanitizer_rt_symbols(clang_rt.tsan_cxx
       ARCHS ${arch}
       EXTRA rtl/tsan.syms.extra)
     add_dependencies(tsan clang_rt.tsan-${arch}
                           clang_rt.tsan_cxx-${arch}

libcxx/utils/merge_archives.py

 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
 # 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
 #
 #===----------------------------------------------------------------------===##
 
 from argparse import ArgumentParser
+from ctypes.util import find_library
 import distutils.spawn
 import tempfile
 import os
 import shutil
 import subprocess
 import signal
 import sys