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#-------------------------------------------------------------------------------
# GraphBLAS/cmake_modules/GraphBLAS_complex.cmake
#-------------------------------------------------------------------------------
# SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2024-2025, All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
#-------------------------------------------------------------------------------
# Check for C compiler support for complex floating point numbers and used API
include ( CheckSourceCompiles )
# Check for C99 complex number arithmetic
check_source_compiles ( C
"#include <complex.h>
int main (void)
{
double _Complex z1 = 1.0 ;
double _Complex z2 = 1.0 * I ;
double _Complex z3 = z1 * z2 ;
return ((int) creal (z3)) ;
}"
GxB_HAVE_COMPLEX_C99 )
if ( NOT GxB_HAVE_COMPLEX_C99 )
# Check for complex number arithmetic as implemented by MSVC
check_source_compiles ( C
"#include <complex.h>
int main (void)
{
_Dcomplex z1 = {1., 0.} ;
_Dcomplex z2 = {0., 1.} ;
_Dcomplex z3 = _Cmulcc(z1, z2) ;
return 0 ;
}"
GxB_HAVE_COMPLEX_MSVC )
endif ( )
if ( NOT GxB_HAVE_COMPLEX_C99 AND NOT GxB_HAVE_COMPLEX_MSVC )
message ( FATAL_ERROR "The selected C compiler does not support complex floating point numbers; try another compiler." )
endif ( )
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