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1 | dnl Copyright (C) 2008-2011 Free Software Foundation, Inc. |
2 | dnl This file is free software; the Free Software Foundation | |
3 | dnl gives unlimited permission to copy and/or distribute it, | |
4 | dnl with or without modifications, as long as this notice is preserved. | |
5 | ||
6 | dnl From Simon Josefsson | |
bdf5f542 | 7 | dnl -- derivated from coreutils m4/warnings.m4 |
0e60bc9b KZ |
8 | |
9 | # UL_AS_VAR_APPEND(VAR, VALUE) | |
10 | # ---------------------------- | |
11 | # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. | |
12 | m4_ifdef([AS_VAR_APPEND], | |
13 | [m4_copy([AS_VAR_APPEND], [UL_AS_VAR_APPEND])], | |
14 | [m4_define([UL_AS_VAR_APPEND], | |
15 | [AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])]) | |
16 | ||
7697771d | 17 | # UL_ADD_WARN(COMPILER_OPTION [, VARNAME]) |
4e806975 | 18 | # ------------------------ |
7697771d | 19 | # Adds parameter to WARN_CFLAGS (or to $VARNAME) if the compiler supports it. |
4e806975 | 20 | AC_DEFUN([UL_WARN_ADD], [ |
7697771d | 21 | m4_define([warnvarname], m4_default([$2],WARN_CFLAGS)) |
55eec264 KZ |
22 | AS_VAR_PUSHDEF([ul_Warn], [ul_cv_warn_$1])dnl |
23 | AC_CACHE_CHECK([whether compiler handles $1], m4_defn([ul_Warn]), [ | |
e85e8720 RM |
24 | # store AC_LANG_WERROR status, then turn it on |
25 | save_ac_[]_AC_LANG_ABBREV[]_werror_flag="${ac_[]_AC_LANG_ABBREV[]_werror_flag}" | |
26 | AC_LANG_WERROR | |
27 | ||
55eec264 | 28 | ul_save_CPPFLAGS="$CPPFLAGS" |
4e806975 | 29 | CPPFLAGS="-Werror ${CPPFLAGS} $1" |
55eec264 KZ |
30 | AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])], |
31 | [AS_VAR_SET(ul_Warn, [yes])], | |
32 | [AS_VAR_SET(ul_Warn, [no])]) | |
e85e8720 RM |
33 | # restore AC_LANG_WERROR |
34 | ac_[]_AC_LANG_ABBREV[]_werror_flag="${save_ac_[]_AC_LANG_ABBREV[]_werror_flag}" | |
35 | ||
55eec264 KZ |
36 | CPPFLAGS="$ul_save_CPPFLAGS" |
37 | ]) | |
7697771d | 38 | AS_VAR_IF(ul_Warn, [yes], [UL_AS_VAR_APPEND(warnvarname, [" $1"])]) |
0e60bc9b | 39 | ]) |
55eec264 | 40 |