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33eda43042
(Does unconfig.h really need to be in the git tree?) Signed-off-by: H. Peter Anvin <hpa@zytor.com>
37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
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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AC_CACHE_CHECK([if $CC supports varadic macro comma dropping],
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[pa_cv_varadic_macros_comma_hack],
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[AC_LINK_IFELSE([AC_LANG_SOURCE([
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AC_INCLUDES_DEFAULT
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#define myprintf(f, ...) printf(f, ## __VA_ARGS__)
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int main(void)
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{
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myprintf("hello");
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return 0;
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}
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])])],
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[pa_cv_varadic_macros_comma_hack=yes],
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[pa_cv_varadic_macros_comma_hack=no])
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AS_IF([test "x$pa_cv_varadic_macros_comma_hack" = xyes],
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[AC_DEFINE([HAVE_VARADIC_MACROS_COMMA_HACK], 1,
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[define to 1 if your compiler supports the , ## __VA_ARGS__ hack.])])
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])])
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