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FindQuadmath: add -fext-numeric-literals if the compiler supports it

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this is required for GCC >= 4.8 to support the 'Q' suffix for floating
point literals (which are used in the quadmath.h header)

In order to prevent compilers which eat the flag but do not support it
from complaining constantly, it is tested for with "-Werror" enabled...
This commit is contained in:
Andreas Lauser 2014-08-18 12:16:04 +02:00 committed by Bård Skaflestad
parent 57879ab6c9
commit c3304ed1a1
1 changed files with 6 additions and 0 deletions
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6
cmake/Modules/FindQuadmath.cmake
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@ -9,6 +9,12 @@
include(CheckCSourceCompiles)
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()
cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_LIBRARIES "quadmath")