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c1d8d953c1
I haven't figured out why this happens, but on one of my computers
running kubuntu 13.10 g++ says the following if one tries to use
quadruple precision math:
/home/erne/src/ewoms/ewoms/common/quad.hh: In static member function ‘static quad std::numeric_limits<__float128>::min()’:
/home/erne/src/ewoms/ewoms/common/quad.hh:52:14: error: unable to find numeric literal operator ‘operator"" Q’
{ return FLT128_MIN; }
since this happens only on this machine and only with the c++ (but
not the C) compiler, i suppose that this is either an upgrade issue
with kubuntu or an issue with the ubuntu gcc stack. Strangely enough,
my other kubuntu machine does not have a problem with that...
In any case also testing for assignability of constants and using the
C++ compiler for the quadmath test won't hurt...
34 lines
707 B
CMake
34 lines
707 B
CMake
# Module that checks whether the compiler supports the
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# quadruple precision floating point math
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#
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# Sets the following variables:
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# HAVE_QUAD
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# QUADMATH_LIBRARIES
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#
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# perform tests
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include(CheckCSourceCompiles)
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include(CheckCXXSourceCompiles)
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include(CMakePushCheckState)
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cmake_push_check_state()
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list(APPEND CMAKE_REQUIRED_LIBRARIES "quadmath")
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CHECK_CXX_SOURCE_COMPILES("
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#include <quadmath.h>
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int main(void){
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__float128 foo = sqrtq(123.456);
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foo = FLT128_MIN;
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}" HAVE_QUAD)
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cmake_pop_check_state()
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if (HAVE_QUAD)
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set(QUADMATH_LIBRARIES "quadmath")
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(QuadMath
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DEFAULT_MSG
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QUADMATH_LIBRARIES
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HAVE_QUAD
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)
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