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FindThreads: Factor out helper macro for libc check

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This commit is contained in:
Brad King
2022-04-14 13:24:16 -04:00
parent 564385194b
commit c53748a377
1 changed files with 17 additions and 9 deletions
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26
Modules/FindThreads.cmake
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@@ -89,6 +89,22 @@ int main(void)
}
]====])
# Internal helper macro.
# Do NOT even think about using it outside of this file!
macro(_threads_check_libc)
if(NOT Threads_FOUND)
if(CMAKE_C_COMPILER_LOADED)
CHECK_C_SOURCE_COMPILES("${PTHREAD_C_CXX_TEST_SOURCE}" CMAKE_HAVE_LIBC_PTHREAD)
elseif(CMAKE_CXX_COMPILER_LOADED)
CHECK_CXX_SOURCE_COMPILES("${PTHREAD_C_CXX_TEST_SOURCE}" CMAKE_HAVE_LIBC_PTHREAD)
endif()
if(CMAKE_HAVE_LIBC_PTHREAD)
set(CMAKE_THREAD_LIBS_INIT "")
set(Threads_FOUND TRUE)
endif()
endif ()
endmacro()
# Internal helper macro.
# Do NOT even think about using it outside of this file!
macro(_threads_check_lib LIBNAME FUNCNAME VARNAME)
@@ -157,15 +173,7 @@ if(CMAKE_HAVE_PTHREAD_H)
# We list some pthread functions in PTHREAD_C_CXX_TEST_SOURCE test code.
# If the pthread functions already exist in C library, we could just use
# them instead of linking to the additional pthread library.
if(CMAKE_C_COMPILER_LOADED)
CHECK_C_SOURCE_COMPILES("${PTHREAD_C_CXX_TEST_SOURCE}" CMAKE_HAVE_LIBC_PTHREAD)
elseif(CMAKE_CXX_COMPILER_LOADED)
CHECK_CXX_SOURCE_COMPILES("${PTHREAD_C_CXX_TEST_SOURCE}" CMAKE_HAVE_LIBC_PTHREAD)
endif()
if(CMAKE_HAVE_LIBC_PTHREAD)
set(CMAKE_THREAD_LIBS_INIT "")
set(Threads_FOUND TRUE)
endif()
_threads_check_libc()
# Check for -pthread first if enabled. This is the recommended
# way, but not backwards compatible as one must also pass -pthread