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FindThreads: Replace the pthread symbol checking in libc.

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With asan build, we will have the pthread_create() symbol in libc. However,
libasan doesn't have full pthread implementation. We can't assume that we
have the pthread implementation in libc using pthread_create() symbol.
Replace the pthread_create() with pthread_kill() as a quick fix.
This commit is contained in:
JerryShih
2018-11-18 03:15:17 +08:00
parent be9ad8279a
commit e9a1ddc594
1 changed files with 12 additions and 4 deletions
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16
Modules/FindThreads.cmake
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@@ -131,9 +131,17 @@ else()
#
set(CMAKE_HAVE_THREADS_LIBRARY)
if(NOT THREADS_HAVE_PTHREAD_ARG)
# Check if pthread functions are in normal C library
CHECK_SYMBOL_EXISTS(pthread_create pthread.h CMAKE_HAVE_LIBC_CREATE)
if(CMAKE_HAVE_LIBC_CREATE)
# Check if pthread functions are in normal C library.
# If the pthread functions already exist in C library, we could just use
# them instead of linking to the additional pthread library. We could
# try to check any pthread symbol name, but here is an exception. If we
# use clang asan build, we will find the pthread_create() symbol in the
# libc(libasan). However, it doesn't have the full pthread implementation.
# So, we can't assume that we have the pthread implementation in libc
# using the pthread_create() checking here. Then, we turn to check the
# pthread_kill() symbol instead.
CHECK_SYMBOL_EXISTS(pthread_kill pthread.h CMAKE_HAVE_LIBC_PTHREAD_KILL)
if(CMAKE_HAVE_LIBC_PTHREAD_KILL)
set(CMAKE_THREAD_LIBS_INIT "")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(Threads_FOUND TRUE)
@@ -159,7 +167,7 @@ else()
endif()
endif()
if(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE)
if(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_PTHREAD_KILL)
set(CMAKE_USE_PTHREADS_INIT 1)
set(Threads_FOUND TRUE)
endif()