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Merge pull request #6831 from Benitoite/patch-27

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detects libatomic flags in a cmake module
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Beep6581 2023-08-28 21:48:45 +02:00 committed by GitHub
commit 7f08287fdd
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3 changed files with 46 additions and 3 deletions
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6
CMakeLists.txt
View File

@ -565,6 +565,12 @@ if(WITH_MYFILE_MMAP)
add_definitions(-DMYFILE_MMAP)
endif()
# Atomic is required in some builds: #6821
find_package(ATOMIC)
if(ATOMIC_FOUND)
target_link_libraries(executable ${ATOMIC_LIBRARIES})
endif()
if(WITH_LTO)
# Using LTO with older versions of binutils requires setting extra flags
set(BINUTILS_VERSION_MININUM "2.29")

36
cmake/modules/FindATOMIC.cmake Normal file
View File

@ -0,0 +1,36 @@
include(CheckCXXSourceCompiles)
set(ATOMIC_CXX_TEST_SOURCE
"
#include <atomic>
int main() {
std::atomic<bool> b(false);
std::atomic<int> i(0);
std::atomic<unsigned int> ui(0);
b.exchange(true);
++i;
return ++ui;
}
")
set(SAFE_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "atomic")
check_cxx_source_compiles("${ATOMIC_CXX_TEST_SOURCE}" HAVE_CXX_ATOMICS_WITHOUT_LIB)
if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB)
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_cxx_source_compiles("${ATOMIC_CXX_TEST_SOURCE}" HAVE_CXX_ATOMICS_WITH_LIB)
if (NOT HAVE_CXX_ATOMICS_WITH_LIB)
message(FATAL_ERROR "libatomic support needed for std::atomic<> but not
found.")
endif()
set(ATOMIC_LIBRARIES "atomic")
set(ATOMIC_FOUND ON)
endif()
set(CMAKE_REQUIRED_LIBRARIES "${SAFE_CMAKE_REQUIRED_LIBRARIES}")
unset(SAFE_CMAKE_REQUIRED_LIBRARIES)
mark_as_advanced(ATOMIC_LIBRARIES)
mark_as_advanced(ATOMIC_FOUND)

7
rtgui/CMakeLists.txt
View File

@ -251,9 +251,10 @@ else()
endif()
# Excluding libatomic needed by Clang/FreeBSD, #3636
if(OPENMP_FOUND AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
set(EXTRA_LIB_RTGUI "${EXTRA_LIB_RTGUI}" "atomic")
endif()
# Now handled in cmake/modules/findATOMIC.cmake, #6821
# if(OPENMP_FOUND AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
# set(EXTRA_LIB_RTGUI "${EXTRA_LIB_RTGUI}" "atomic")
# endif()
# Create config.h which defines where data are stored
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/config.h.in" "${CMAKE_CURRENT_BINARY_DIR}/config.h")