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