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26 lines
921 B
Plaintext
26 lines
921 B
Plaintext
# va-args.m4 serial 1
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dnl Copyright (C) 2009-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Test for variadic macro support.
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dnl Define HAVE_VA_ARGS if macros can use __VA_ARGS__.
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AC_DEFUN([gl_VA_ARGS],
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[
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AC_CACHE_CHECK([whether the preprocessor allows variadic macros],
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[gl_cv_c_va_args],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#include <stdio.h>
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#define a(func, arg, ...) func (arg, __VA_ARGS__)
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#define b(...) a (__VA_ARGS__)
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]], [[b (printf, "%s", "test");]])],
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[gl_cv_c_va_args=yes], [gl_cv_c_va_args=no])
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])
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if test $gl_cv_c_va_args = yes; then
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AC_DEFINE([HAVE_VA_ARGS], [1],
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[Define to 1 if the preprocessor supports variadic macros and
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__VA_ARGS__.])
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fi
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])
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