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40 lines
1.5 KiB
Text
40 lines
1.5 KiB
Text
dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Simon Josefsson
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dnl -- derivated from coreutils m4/warnings.m4
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# UL_AS_VAR_APPEND(VAR, VALUE)
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# ----------------------------
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# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
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m4_ifdef([AS_VAR_APPEND],
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[m4_copy([AS_VAR_APPEND], [UL_AS_VAR_APPEND])],
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[m4_define([UL_AS_VAR_APPEND],
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[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
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# UL_ADD_WARN(COMPILER_OPTION [, VARNAME])
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# ------------------------
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# Adds parameter to WARN_CFLAGS (or to $VARNAME) if the compiler supports it.
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AC_DEFUN([UL_WARN_ADD], [
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m4_define([warnvarname], m4_default([$2],WARN_CFLAGS))
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AS_VAR_PUSHDEF([ul_Warn], [ul_cv_warn_$1])dnl
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AC_CACHE_CHECK([whether compiler handles $1], m4_defn([ul_Warn]), [
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# store AC_LANG_WERROR status, then turn it on
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save_ac_[]_AC_LANG_ABBREV[]_werror_flag="${ac_[]_AC_LANG_ABBREV[]_werror_flag}"
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AC_LANG_WERROR
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ul_save_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS="-Werror ${CPPFLAGS} $1"
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AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
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[AS_VAR_SET(ul_Warn, [yes])],
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[AS_VAR_SET(ul_Warn, [no])])
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# restore AC_LANG_WERROR
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ac_[]_AC_LANG_ABBREV[]_werror_flag="${save_ac_[]_AC_LANG_ABBREV[]_werror_flag}"
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CPPFLAGS="$ul_save_CPPFLAGS"
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])
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AS_VAR_IF(ul_Warn, [yes], [UL_AS_VAR_APPEND(warnvarname, [" $1"])])
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])
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