mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-20 10:23:57 +00:00
79 lines
2.8 KiB
Plaintext
79 lines
2.8 KiB
Plaintext
# stdarg.m4 serial 6
|
|
dnl Copyright (C) 2006, 2008-2013 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],
|
|
[
|
|
STDARG_H=''
|
|
NEXT_STDARG_H='<stdarg.h>'
|
|
AC_MSG_CHECKING([for va_copy])
|
|
AC_CACHE_VAL([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])])
|
|
AC_MSG_RESULT([$gl_cv_func_va_copy])
|
|
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 $gl_aixcc = yes; then
|
|
dnl Provide a substitute <stdarg.h> file.
|
|
STDARG_H=stdarg.h
|
|
gl_NEXT_HEADERS([stdarg.h])
|
|
dnl Fallback for the case when <stdarg.h> contains only macro definitions.
|
|
if test "$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 $gl_cv_func___va_copy = yes; then
|
|
AC_DEFINE([va_copy], [__va_copy],
|
|
[Define as a macro for copying va_list variables.])
|
|
else
|
|
AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */
|
|
#define gl_va_copy(a,b) ((a) = (b))])
|
|
AC_DEFINE([va_copy], [gl_va_copy],
|
|
[Define as a macro for copying va_list variables.])
|
|
fi
|
|
fi
|
|
fi
|
|
AC_SUBST([STDARG_H])
|
|
AM_CONDITIONAL([GL_GENERATE_STDARG_H], [test -n "$STDARG_H"])
|
|
AC_SUBST([NEXT_STDARG_H])
|
|
])
|