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# Module that checks whether the compiler supports the
# quadruple precision floating point math
#
# Adds target QuadMath::QuadMath if found
#
# perform tests
include(CheckCXXSourceCompiles)
include(CMakePushCheckState)
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES quadmath)
if(${CMAKE_CXX_COMPILER_ID} STREQUAL GNU)
set(CMAKE_REQUIRED_FLAGS "-fext-numeric-literals")
endif()
check_cxx_source_compiles("
#include <quadmath.h>
int main ()
{
__float128 r = 1.0q;
r = strtoflt128(\"1.2345678\", NULL);
return 0;
}" QuadMath_COMPILES)
cmake_pop_check_state() # Reset CMAKE_REQUIRED_XXX variables
if(QuadMath_COMPILES)
# Use additional variable for better report message
set(QuadMath_VAR "(Supported by compiler)")
endif()
# Report that package was found
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(QuadMath
DEFAULT_MSG
QuadMath_VAR QuadMath_COMPILES
)
# add imported target for quadmath
if(QuadMath_FOUND AND NOT TARGET QuadMath::QuadMath)
# Compiler supports QuadMath: Add appropriate linker flag
add_library(QuadMath::QuadMath INTERFACE IMPORTED)
target_link_libraries(QuadMath::QuadMath INTERFACE quadmath)
target_compile_definitions(QuadMath::QuadMath INTERFACE
_GLIBCXX_USE_FLOAT128
)
target_compile_options(QuadMath::QuadMath INTERFACE
$<$<CXX_COMPILER_ID:GNU>:-fext-numeric-literals>
)
# Check for numeric_limits specialization
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES quadmath)
set(CMAKE_REQUIRED_FLAGS)
if(${CMAKE_CXX_COMPILER_ID} STREQUAL GNU)
set(CMAKE_REQUIRED_FLAGS "-fext-numeric-literals")
endif()
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_GLIBCXX_USE_FLOAT128")
check_cxx_source_compiles("
#include <limits>
int main()
{
static_assert(std::numeric_limits<__float128>::is_specialized);
return 0;
}" QuadMath_HAS_LIMITS)
cmake_pop_check_state() # Reset CMAKE_REQUIRED_XXX variables
if(QuadMath_HAS_LIMITS)
target_compile_definitions(QuadMath::QuadMath INTERFACE LIMITS_HAS_QUAD=1)
endif()
endif()
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