1# stdarg.m4 serial 1
2dnl Copyright (C) 2006 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8dnl Provide a working va_copy in combination with <stdarg.h>.
9
10AC_DEFUN([gl_STDARG_H],
11[
12  AC_MSG_CHECKING([for va_copy])
13  AC_CACHE_VAL([gl_cv_func_va_copy], [
14    AC_TRY_COMPILE([#include <stdarg.h>], [
15#ifndef va_copy
16void (*func) (va_list, va_list) = va_copy;
17#endif
18],
19      [gl_cv_func_va_copy=yes], [gl_cv_func_va_copy=no])])
20  AC_MSG_RESULT([$gl_cv_func_va_copy])
21  if test $gl_cv_func_va_copy = no; then
22    # Provide a substitute, either __va_copy or as a simple assignment.
23    AC_CACHE_VAL([gl_cv_func___va_copy], [
24      AC_TRY_COMPILE([#include <stdarg.h>], [
25#ifndef __va_copy
26error, bail out
27#endif
28],
29        [gl_cv_func___va_copy=yes], [gl_cv_func___va_copy=no])])
30    if test $gl_cv_func___va_copy = yes; then
31      AC_DEFINE([va_copy], [__va_copy],
32        [Define as a macro for copying va_list variables.])
33    else
34      AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed.  */
35#define gl_va_copy(a,b) ((a) = (b))])
36      AC_DEFINE([va_copy], [gl_va_copy],
37        [Define as a macro for copying va_list variables.])
38    fi
39  fi
40])
41