Build Issue with M1 MacOS and GCC

[muboheng]

Describe the bug

I am trying to compile on my MacOS 14.3.1 with GCC 13.2.0 but ran into errors.

Expected Behavior

build successfully

Current Behavior

I get the Issue:

/ghRepos/aws-crt-cpp/crt/aws-c-cal/source/darwin/commoncrypto_aes.c: In function 's_cc_crypto_gcm_finalize':
/ghRepos/aws-crt-cpp/crt/aws-c-cal/source/darwin/commoncrypto_aes.c:371:9: warning: implicit declaration of function '__builtin_available'; did you mean '__builtin_scalbl'? [-Wimplicit-function-declaration]
  371 |     if (__builtin_available(macOS 10.13, iOS 11.0, *)) {
      |         ^~~~~~~~~~~~~~~~~~~
      |         __builtin_scalbl
/ghRepos/aws-crt-cpp/crt/aws-c-cal/source/darwin/commoncrypto_aes.c:371:29: error: 'macOS' undeclared (first use in this function)
  371 |     if (__builtin_available(macOS 10.13, iOS 11.0, *)) {
      |                             ^~~~~
/ghRepos/aws-crt-cpp/crt/aws-c-cal/source/darwin/commoncrypto_aes.c:371:29: note: each undeclared identifier is reported only once for each function it appears in
/ghRepos/aws-crt-cpp/crt/aws-c-cal/source/darwin/commoncrypto_aes.c:371:34: error: expected ')' before numeric constant
  371 |     if (__builtin_available(macOS 10.13, iOS 11.0, *)) {
      |                            ~     ^~~~~~
      |                                  )

Reproduction Steps

steps performed:

git clone --recursive https://github.com/awslabs/aws-crt-cpp.git 
mkdir build && cd build
cmake -DCMAKE_C_COMPILER=/opt/homebrew/bin/gcc-13 -DCMAKE_CXX_COMPILER=/opt/homebrew/bin/g++-13 -DCMAKE_OSX_ARCHITECTURES=arm64 ..
make

Possible Solution

No response

Additional Information/Context

I was able to build with apple clang 15.0.0, but I need to work with gcc

aws-crt-cpp version used

latest: https://github.com/awslabs/aws-crt-cpp/commit/4d9e36d561079506272cff59b52d998b6ae81e85

Compiler and version used

gcc version 13.2.0 (Homebrew GCC 13.2.0)

Operating System and version

macOS Sonoma 14.3.1

[DmitriyMusatkin]

Any particular reason why you want to use GCC over clang? CRT relies on specific clang extensions to check for api availability. Besides that GCC would struggle on some Apple headers that CRT includes that rely on Apple Clang extensions.

[github-actions[bot]]

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