cmake check_source_compiles() examples

OSGeo/gdal cmake/modules/CheckLinkerFlag.cmake :80

#check_source_compiles(${_lang} "${_source}" ${_var} ${_common_patterns})

DrTimothyAldenDavis/SuiteSparse GraphBLAS/cmake_modules/GraphBLAS_complex.cmake :16

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 )

DrTimothyAldenDavis/SuiteSparse GraphBLAS/cmake_modules/GraphBLAS_complex.cmake :30

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 )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :273

check_source_compiles ( C
    "int main(void) {
    #pragma GCC ivdep
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_GCC_IVDEP
    FAIL_REGEX "[wW]arning" )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :294

check_source_compiles ( C
    "int main(void) {
    #pragma clang loop vectorize(enable)
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_CLANG_LOOP_VECTORIZE
    FAIL_REGEX "[wW]arning" )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :325

check_source_compiles ( C
    "int main(void) {
    #pragma ivdep
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_IVDEP
    FAIL_REGEX "[wW]arning" )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :347

check_source_compiles ( C
    "int main(void) {
    #pragma loop( ivdep )
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_LOOP_IVDEP
    FAIL_REGEX "[wW]arning" )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :371

check_source_compiles ( C
    "int main(void) {
    #pragma GCC novector
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_GCC_NOVECTOR
    FAIL_REGEX "[wW]arning" )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :393

check_source_compiles ( C
    "int main(void) {
    #pragma novector
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_NOVECTOR
    FAIL_REGEX "[wW]arning" )

DrTimothyAldenDavis/SuiteSparse UMFPACK/CMakeLists.txt :415

check_source_compiles ( C
    "int main(void) {
    #pragma loop( no_vector )
    for (int j = 0; j < 1; j++) { }
    return 0;
    }"
    HAVE_PRAGMA_LOOP_NO_VECTOR
    FAIL_REGEX "[wW]arning" )

apple/swift Runtimes/Core/cmake/modules/CompilerSettings.cmake :25

check_source_compiles(CXX
"#if !(__has_attribute(swiftcall) && \
  __has_attribute(swift_context) && \
  __has_attribute(swift_error_result) && \
  __has_attribute(swift_indirect_result))
#error CXX compiler must support Swift calling conventions
#endif
int main(void) { return 0; }"
HAVE_SWIFTCALL)

apple/swift Runtimes/Core/cmake/modules/CompilerSettings.cmake :39

check_source_compiles(CXX
"#if !(__has_attribute(swiftasynccall) && \
  __has_attribute(swift_async_context))
#error CXX compiler must support Swift async calling conventions
#endif
int main(void) { return 0; }"
HAVE_SWIFT_ASYNC_CALL)