| dnl Copyright (C) 2008-2011 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 Simon Josefsson |
| dnl -- derivated from coreutils m4/warnings.m4 |
| |
| # UL_AS_VAR_APPEND(VAR, VALUE) |
| # ---------------------------- |
| # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. |
| m4_ifdef([AS_VAR_APPEND], |
| [m4_copy([AS_VAR_APPEND], [UL_AS_VAR_APPEND])], |
| [m4_define([UL_AS_VAR_APPEND], |
| [AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])]) |
| |
| # UL_ADD_WARN(COMPILER_OPTION [, VARNAME]) |
| # ------------------------ |
| # Adds parameter to WARN_CFLAGS (or to $VARNAME) if the compiler supports it. |
| AC_DEFUN([UL_WARN_ADD], [ |
| m4_define([warnvarname], m4_default([$2],WARN_CFLAGS)) |
| AS_VAR_PUSHDEF([ul_Warn], [ul_cv_warn_$1])dnl |
| AC_CACHE_CHECK([whether compiler handles $1], m4_defn([ul_Warn]), [ |
| # store AC_LANG_WERROR status, then turn it on |
| save_ac_[]_AC_LANG_ABBREV[]_werror_flag="${ac_[]_AC_LANG_ABBREV[]_werror_flag}" |
| AC_LANG_WERROR |
| |
| ul_save_CPPFLAGS="$CPPFLAGS" |
| CPPFLAGS="-Werror ${CPPFLAGS} $1" |
| AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])], |
| [AS_VAR_SET(ul_Warn, [yes])], |
| [AS_VAR_SET(ul_Warn, [no])]) |
| # restore AC_LANG_WERROR |
| ac_[]_AC_LANG_ABBREV[]_werror_flag="${save_ac_[]_AC_LANG_ABBREV[]_werror_flag}" |
| |
| CPPFLAGS="$ul_save_CPPFLAGS" |
| ]) |
| AS_VAR_IF(ul_Warn, [yes], [UL_AS_VAR_APPEND(warnvarname, [" $1"])]) |
| ]) |
| |