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# va-args.m4 serial 1
dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Test for variadic macro support.
dnl Define HAVE_VA_ARGS if macros can use __VA_ARGS__.
AC_DEFUN([gl_VA_ARGS],
[
AC_CACHE_CHECK([whether the preprocessor allows variadic macros],
[gl_cv_c_va_args],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#define a(func, arg, ...) func (arg, __VA_ARGS__)
#define b(...) a (__VA_ARGS__)
]], [[b (printf, "%s", "test");]])],
[gl_cv_c_va_args=yes], [gl_cv_c_va_args=no])
])
if test $gl_cv_c_va_args = yes; then
AC_DEFINE([HAVE_VA_ARGS], [1],
[Define to 1 if the preprocessor supports variadic macros and
__VA_ARGS__.])
fi
])
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