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Re: Is it safe to use ax_gcc_builtin to detect __builtin_offsetof?
From: |
Jeffrey Walton |
Subject: |
Re: Is it safe to use ax_gcc_builtin to detect __builtin_offsetof? |
Date: |
Sun, 25 Feb 2024 02:28:56 -0500 |
On Sun, Feb 25, 2024 at 2:09 AM Jeffrey Walton <noloader@gmail.com> wrote:
>
> The page <https://www.gnu.org/software/autoconf-archive/ax_gcc_builtin.html>
> does not list __builtin_offsetof in the list of documented builtins.
> But the page says "Unsupported built-ins will be tested with an empty
> parameter set and the result of the check might be wrong or
> meaningless so use with care."
>
> Is it safe to use ax_gcc_builtin to detect __builtin_offsetof?
>
> Sorry to ask. Google is not returning useful results.
Cancel. We can't use AX_GCC_BUILTIN in production. Using
AX_GCC_BUILTIN produces broken configure's:
checking for getpagesize... yes
checking for working mmap... yes
checking for gettimeofday... yes
./configure: line 15023: syntax error near unexpected token `__builtin_offsetof'
./configure: line 15023: `AX_GCC_BUILTIN(__builtin_offsetof)'
Jeff