On Sun, Feb 25, 2024 at 2:09 AM Jeffrey Walton <noloader@xxxxxxxxx> 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
