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# stdarg.m4 serial 1
dnl Copyright (C) 2006 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 From Bruno Haible.
dnl Provide a working va_copy in combination with <stdarg.h>.
AC_DEFUN([gl_STDARG_H],
[
AC_MSG_CHECKING([for va_copy])
AC_CACHE_VAL([gl_cv_func_va_copy], [
AC_TRY_COMPILE([#include <stdarg.h>], [
#ifndef va_copy
void (*func) (va_list, va_list) = va_copy;
#endif
],
[gl_cv_func_va_copy=yes], [gl_cv_func_va_copy=no])])
AC_MSG_RESULT([$gl_cv_func_va_copy])
if test $gl_cv_func_va_copy = no; then
# Provide a substitute, either __va_copy or as a simple assignment.
AC_CACHE_VAL([gl_cv_func___va_copy], [
AC_TRY_COMPILE([#include <stdarg.h>], [
#ifndef __va_copy
error, bail out
#endif
],
[gl_cv_func___va_copy=yes], [gl_cv_func___va_copy=no])])
if test $gl_cv_func___va_copy = yes; then
AC_DEFINE([va_copy], [__va_copy],
[Define as a macro for copying va_list variables.])
else
AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */
#define gl_va_copy(a,b) ((a) = (b))])
AC_DEFINE([va_copy], [gl_va_copy],
[Define as a macro for copying va_list variables.])
fi
fi
])
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