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0e7eae99e8
Variadic macros are really useful, even if we can only use them conditionally. Unfortunately this means removing -Wc90-c99-compat, because apparently -Wno-variadic-macros is broken in gcc 13.2. Fortunately it is 2023... Signed-off-by: H. Peter Anvin <hpa@zytor.com>
21 lines
751 B
Plaintext
21 lines
751 B
Plaintext
dnl --------------------------------------------------------------------------
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dnl PA_VARIADIC_MACROS
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dnl
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dnl Check to see if the compiler supports C99 variadic macros.
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dnl --------------------------------------------------------------------------
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AC_DEFUN([PA_VARIADIC_MACROS],
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[AC_CACHE_CHECK([if $CC supports variadic macros], [pa_cv_variadic_macros],
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[AC_LINK_IFELSE([AC_LANG_SOURCE([
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AC_INCLUDES_DEFAULT
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#define myprintf(f, ...) printf(f, __VA_ARGS__)
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int main(void)
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{
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myprintf("%s", "Hello, World!\n");
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return 0;
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}
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])],[pa_cv_variadic_macros=yes],[pa_cv_variadic_macros=no])])
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AS_IF([test "x$pa_cv_variadic_macros" = xyes],
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[AC_DEFINE([HAVE_VARIADIC_MACROS], 1,
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[define to 1 if your compiler supports C99 __VA_ARGS__ variadic macros.])])
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])
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