GCC 13 error on #include <TargetConditionals.h> #5216

tcbrindle · 2024-03-21T15:13:19Z

tcbrindle
Mar 21, 2024

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Description of issue

I'm using a C++ library (Catch2) which #includes the MacOS system header TargetConditionals.h. Attempting to #include this file with the latest GCC from Homebrew leads to an error:

In file included from gcc_bug.c:2:
/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk/usr/include/TargetConditionals.h:140:50: error: missing binary operator before token "("
  140 | #if !defined(__has_extension) || !__has_extension(define_target_os_macros)
      |                                                  ^

Reproducing the issue is trivial: attempt to compile the following C file with Homebrew gcc-13:

#include <TargetConditionals.h>

int main() {}

Homebrew's gcc-11 and gcc-12 work okay, so this may be a compiler bug in gcc-13, or it may be that Apple has updated TargetConditionals.h to use a Clang compiler extension that earlier GCCs avoided hitting?

Does anyone have a simple workaround for this?

Thanks in advance

Relevant casks

gcc

Answered by Bo98

Mar 21, 2024

It's going to be fixed in GCC 14 I believe (usually late April/early May).

It's technically an SDK bug introduced in Xcode/CLT 15.3 however.

There's not really many workarounds, though one workaround could be:

#ifndef __has_extension
#define __has_extension(x) 0
#endif

before any includes

View full answer

Bo98 · 2024-03-21T15:22:18Z

Bo98
Mar 21, 2024
Maintainer

It's going to be fixed in GCC 14 I believe (usually late April/early May).

It's technically an SDK bug introduced in Xcode/CLT 15.3 however.

There's not really many workarounds, though one workaround could be:

#ifndef __has_extension
#define __has_extension(x) 0
#endif

before any includes

0 replies

tcbrindle · 2024-03-21T17:53:38Z

tcbrindle
Mar 21, 2024
Author

Thanks for the reply @Bo98.

I've managed to work around it by locally patching my copy of Catch2 to avoid the problematic include. I guess beyond that I'll just have to wait for GCC 14, or hope that Apple fix the header.

0 replies

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GCC 13 error on #include <TargetConditionals.h> #5216

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Homebrew

GCC 13 error on #include <TargetConditionals.h> #5216

tcbrindle Mar 21, 2024

Output of brew config

Output of brew doctor

Description of issue

Relevant casks

Replies: 2 comments

Bo98 Mar 21, 2024 Maintainer

tcbrindle Mar 21, 2024 Author

tcbrindle
Mar 21, 2024

Output of `brew config`

Output of `brew doctor`

Bo98
Mar 21, 2024
Maintainer

tcbrindle
Mar 21, 2024
Author