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+# stdarg.m4 serial 8
+dnl Copyright (C) 2006, 2008-2022 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],
+[
+ GL_GENERATE_STDARG_H=false
+ NEXT_STDARG_H='<stdarg.h>'
+ AC_CACHE_CHECK([for va_copy],
+ [gl_cv_func_va_copy],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#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])
+ ])
+ if test $gl_cv_func_va_copy = no; then
+ dnl Provide a substitute.
+ dnl Usually a simple definition in <config.h> is enough. Not so on AIX 5
+ dnl with some versions of the /usr/vac/bin/cc compiler. It has an <stdarg.h>
+ dnl which does '#undef va_copy', leading to a missing va_copy symbol. For
+ dnl this platform, we use an <stdarg.h> substitute. But we cannot use this
+ dnl approach on other platforms, because <stdarg.h> often defines only
+ dnl preprocessor macros and gl_ABSOLUTE_HEADER, gl_CHECK_NEXT_HEADERS do
+ dnl not work in this situation.
+ AC_EGREP_CPP([vaccine],
+ [#if defined _AIX && !defined __GNUC__
+ AIX vaccine
+ #endif
+ ], [gl_aixcc=yes], [gl_aixcc=no])
+ if test $gl_aixcc = yes; then
+ dnl Provide a substitute <stdarg.h> file.
+ GL_GENERATE_STDARG_H=true
+ gl_NEXT_HEADERS([stdarg.h])
+ dnl Fallback for the case when <stdarg.h> contains only macro definitions.
+ if test "$gl_cv_next_stdarg_h" = '""'; then
+ gl_cv_next_stdarg_h='"///usr/include/stdarg.h"'
+ NEXT_STDARG_H="$gl_cv_next_stdarg_h"
+ fi
+ else
+ dnl Provide a substitute in <config.h>, either __va_copy or as a simple
+ dnl assignment.
+ gl_CACHE_VAL_SILENT([gl_cv_func___va_copy], [
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#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
+ fi
+ AC_SUBST([NEXT_STDARG_H])
+])