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include(CheckCSourceCompiles)
include(CMakePushCheckState)
macro(check_tls_support VAR)
if(NOT DEFINED "${VAR}")
cmake_push_check_state()
set(CMAKE_REQUIRED_QUIET 1)
check_c_source_compiles("
__thread int tls;
int main(void) {
return 0;
}" HAVE_GCC_TLS)
if(HAVE_GCC_TLS)
message(STATUS "Thread-local storage: supported (__thread)")
set(${VAR} "__thread" CACHE INTERNAL "Thread-local storage support keyword in compiler")
else()
check_c_source_compiles("
__declspec(thread) int tls;
int main(void) {
return 0;
}" HAVE_MSVC_TLS)
if(HAVE_MSVC_TLS)
message(STATUS "Thread-local storage: supported (__declspec(thread))")
set(${VAR} "__declspec(thread)" CACHE INTERNAL "Thread-local storage keyword in compiler")
else()
message(STATUS "Thread-local storage: not supported")
set(${VAR} "" CACHE INTERNAL "Thread-local storage keyword in compiler")
endif()
endif()
cmake_pop_check_state()
endif()
endmacro()
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