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refine FindQuadmath.cmake

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with this, it is now possible to disable quadruple precision math
detection without hacks. (by setting USE_QUADMATH to ON or OFF)
This commit is contained in:
Andreas Lauser 2016-04-11 14:30:07 +02:00
parent 42a9be4ce0
commit 8ccd328b87
1 changed files with 21 additions and 11 deletions
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32
cmake/Modules/FindQuadmath.cmake
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@ -11,24 +11,34 @@ include(CheckCXXSourceCompiles)
include(CMakePushCheckState)
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-Werror -fext-numeric-literals" HAVE_EXTENDED_NUMERIC_LITERALS)
if (HAVE_EXTENDED_NUMERIC_LITERALS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fext-numeric-literals")
endif()
if(NOT DEFINED USE_QUADMATH OR USE_QUADMATH)
if(NOT DEFINED HAVE_EXTENDED_NUMERIC_LITERALS)
check_cxx_compiler_flag("-Werror -fext-numeric-literals" HAVE_EXTENDED_NUMERIC_LITERALS)
endif()
cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_LIBRARIES "quadmath")
CHECK_CXX_SOURCE_COMPILES("
if (HAVE_EXTENDED_NUMERIC_LITERALS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fext-numeric-literals")
endif()
cmake_push_check_state(RESET)
list(APPEND CMAKE_REQUIRED_LIBRARIES "quadmath")
CHECK_CXX_SOURCE_COMPILES("
#include <quadmath.h>
int main(void){
__float128 foo = sqrtq(123.456);
foo = FLT128_MIN;
}" HAVE_QUAD)
cmake_pop_check_state()
}" QUADMATH_FOUND)
cmake_pop_check_state()
if (HAVE_QUAD)
set(QUADMATH_LIBRARIES "quadmath")
if (QUADMATH_FOUND)
set(QUADMATH_LIBRARIES "quadmath")
set(HAVE_QUAD "${QUADMATH_FOUND}")
endif()
endif()
if (USE_QUADMATH AND NOT QUADMATH_FOUND)
message(FATAL_ERROR "Quadruple precision math support was explicitly requested but is unavailable!")
endif()
include(FindPackageHandleStandardArgs)