HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| c378da0b | 1 | # stdarg.m4 serial 6 |
| ab422c4d | 2 | dnl Copyright (C) 2006, 2008-2013 Free Software Foundation, Inc. |
| c378da0b PE |
3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, | |
| 5 | dnl with or without modifications, as long as this notice is preserved. | |
| 6 | ||
| 7 | dnl From Bruno Haible. | |
| 8 | dnl Provide a working va_copy in combination with <stdarg.h>. | |
| 9 | ||
| 10 | AC_DEFUN([gl_STDARG_H], | |
| 11 | [ | |
| 12 | STDARG_H='' | |
| 13 | NEXT_STDARG_H='<stdarg.h>' | |
| 14 | AC_MSG_CHECKING([for va_copy]) | |
| 15 | AC_CACHE_VAL([gl_cv_func_va_copy], [ | |
| 16 | AC_COMPILE_IFELSE( | |
| 17 | [AC_LANG_PROGRAM( | |
| 18 | [[#include <stdarg.h>]], | |
| 19 | [[ | |
| 20 | #ifndef va_copy | |
| 21 | void (*func) (va_list, va_list) = va_copy; | |
| 22 | #endif | |
| 23 | ]])], | |
| 24 | [gl_cv_func_va_copy=yes], | |
| 25 | [gl_cv_func_va_copy=no])]) | |
| 26 | AC_MSG_RESULT([$gl_cv_func_va_copy]) | |
| 27 | if test $gl_cv_func_va_copy = no; then | |
| 28 | dnl Provide a substitute. | |
| 29 | dnl Usually a simple definition in <config.h> is enough. Not so on AIX 5 | |
| 30 | dnl with some versions of the /usr/vac/bin/cc compiler. It has an <stdarg.h> | |
| 31 | dnl which does '#undef va_copy', leading to a missing va_copy symbol. For | |
| 32 | dnl this platform, we use an <stdarg.h> substitute. But we cannot use this | |
| 33 | dnl approach on other platforms, because <stdarg.h> often defines only | |
| 34 | dnl preprocessor macros and gl_ABSOLUTE_HEADER, gl_CHECK_NEXT_HEADERS do | |
| 35 | dnl not work in this situation. | |
| 36 | AC_EGREP_CPP([vaccine], | |
| 37 | [#if defined _AIX && !defined __GNUC__ | |
| 38 | AIX vaccine | |
| 39 | #endif | |
| 40 | ], [gl_aixcc=yes], [gl_aixcc=no]) | |
| 41 | if test $gl_aixcc = yes; then | |
| 42 | dnl Provide a substitute <stdarg.h> file. | |
| 43 | STDARG_H=stdarg.h | |
| 44 | gl_NEXT_HEADERS([stdarg.h]) | |
| 45 | dnl Fallback for the case when <stdarg.h> contains only macro definitions. | |
| 46 | if test "$gl_cv_next_stdarg_h" = '""'; then | |
| 47 | gl_cv_next_stdarg_h='"///usr/include/stdarg.h"' | |
| 48 | NEXT_STDARG_H="$gl_cv_next_stdarg_h" | |
| 49 | fi | |
| 50 | else | |
| 51 | dnl Provide a substitute in <config.h>, either __va_copy or as a simple | |
| 52 | dnl assignment. | |
| 53 | gl_CACHE_VAL_SILENT([gl_cv_func___va_copy], [ | |
| 54 | AC_COMPILE_IFELSE( | |
| 55 | [AC_LANG_PROGRAM( | |
| 56 | [[#include <stdarg.h>]], | |
| 57 | [[ | |
| 58 | #ifndef __va_copy | |
| 59 | error, bail out | |
| 60 | #endif | |
| 61 | ]])], | |
| 62 | [gl_cv_func___va_copy=yes], | |
| 63 | [gl_cv_func___va_copy=no])]) | |
| 64 | if test $gl_cv_func___va_copy = yes; then | |
| 65 | AC_DEFINE([va_copy], [__va_copy], | |
| 66 | [Define as a macro for copying va_list variables.]) | |
| 67 | else | |
| 68 | AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */ | |
| 69 | #define gl_va_copy(a,b) ((a) = (b))]) | |
| 70 | AC_DEFINE([va_copy], [gl_va_copy], | |
| 71 | [Define as a macro for copying va_list variables.]) | |
| 72 | fi | |
| 73 | fi | |
| 74 | fi | |
| 75 | AC_SUBST([STDARG_H]) | |
| 76 | AM_CONDITIONAL([GL_GENERATE_STDARG_H], [test -n "$STDARG_H"]) | |
| 77 | AC_SUBST([NEXT_STDARG_H]) | |
| 78 | ]) |