AwsFeatureTests.cmake

# Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#  http://aws.amazon.com/apache2.0
#
# or in the "license" file accompanying this file. This file is distributed
# on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied. See the License for the specific language governing
# permissions and limitations under the License.

include(CheckCSourceRuns)
include(AwsCFlags)

if(NOT CMAKE_CROSSCOMPILING)
    check_c_source_runs("
    #include <stdbool.h>
    bool foo(int a, int b, int *c) {
        return __builtin_mul_overflow(a, b, c);
    }

    int main() {
        int out;
        if (foo(1, 2, &out)) {
            return 0;
        }

        return 0;
    }" AWS_HAVE_GCC_OVERFLOW_MATH_EXTENSIONS)

    check_c_source_runs("
    int main() {
    int foo = 42;
    _mulx_u32(1, 2, &foo);
    return foo != 2;
    }" AWS_HAVE_MSVC_MULX)

endif()

check_c_source_compiles("
int main() {
    int foo = 42, bar = 24;
    __asm__ __volatile__(\"\":\"=r\"(foo):\"r\"(bar):\"memory\");
}" AWS_HAVE_GCC_INLINE_ASM)

if(NOT LEGACY_COMPILER_SUPPORT)
    check_c_source_compiles("
    #include <execinfo.h>
    int main() {
        return 0;
    }" AWS_HAVE_EXECINFO)
endif()