[tracker/tracker-1.0] build: Use CC_CHECK_FLAGS_APPEND m4 macro to make sure GCC supports flags

From: Martyn James Russell <mr src gnome org>
To: commits-list gnome org
Cc:
Subject: [tracker/tracker-1.0] build: Use CC_CHECK_FLAGS_APPEND m4 macro to make sure GCC supports flags
Date: Fri, 22 Aug 2014 11:55:18 +0000 (UTC)
commit 53911e835557ff89fb1b609d78566e5763502108
Author: Martyn Russell <martyn lanedo com>
Date:   Wed Jul 9 16:06:37 2014 +0100

    build: Use CC_CHECK_FLAGS_APPEND m4 macro to make sure GCC supports flags
    
    This is after finding out that some platforms or versions of GCC don't support
    flags like -Wmaybe-uninitialized
    
    The attributes.m4 is stolen from systemd who stole it from xine-lib.
    
    The CFLAGS used for Vala based sources and C only sources are printed in the
    summary in configure now too. While it may look like we use more flags for
    Vala based sources, we don't it's just -Wall with some flags omitted.
    
    Conflicts:
        configure.ac

 configure.ac                  |    4 +-
 m4/attributes.m4              |  616 +++++++++++++++++++++++++++++++++++++++++
 acinclude.m4 => m4/tracker.m4 |   99 +++++--
 3 files changed, 688 insertions(+), 31 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 08f7c8a..76d287e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2690,8 +2690,8 @@ Build Configuration:
        Source code location:                   ${srcdir}
        Compiler:                               ${CC}
        Compiler Warnings:                      $enable_compile_warnings
-          C    Flags:                            $warning_cflags
-          VALA Flags:                            $warning_valaflags
+          C    Flags:                             $warning_cflags
+          VALA Flags:                             $warning_valaflags
 
        Win32:                                  $native_win32
 
diff --git a/m4/attributes.m4 b/m4/attributes.m4
new file mode 100644
index 0000000..50e130d
--- /dev/null
+++ b/m4/attributes.m4
@@ -0,0 +1,616 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
+<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>
+<head>
+<title>systemd/systemd - System and Session Manager</title>
+<meta name='generator' content='cgit v0.9.0.2-2-gbebe'/>
+<meta name='robots' content='index, nofollow'/>
+<link rel='stylesheet' type='text/css' href='http://cgit.freedesktop.org/cgit.css'/>
+<link rel='alternate' title='Atom feed' 
href='http://cgit.freedesktop.org/systemd/systemd/atom/m4/attributes.m4?h=master' 
type='application/atom+xml'/>
+</head>
+<body>
+<div id='cgit'><table id='header'>
+<tr>
+<td class='logo' rowspan='2'><a href='/'><img src='http://cgit.freedesktop.org/logo.png' alt='cgit 
logo'/></a></td>
+<td class='main'><a href='/'>index</a> : <a title='systemd/systemd' 
href='/systemd/systemd/'>systemd/systemd</a></td><td class='form'><form method='get' action=''>
+<select name='h' onchange='this.form.submit();'>
+<option value='master' selected='selected'>master</option>
+</select> <input type='submit' name='' value='switch'/></form></td></tr>
+<tr><td class='sub'>System and Session Manager</td><td class='sub right'>UNKNOWN</td></tr></table>
+<table class='tabs'><tr><td>
+<a href='/systemd/systemd/'>summary</a><a href='/systemd/systemd/refs/'>refs</a><a 
href='/systemd/systemd/log/m4/attributes.m4'>log</a><a class='active' 
href='/systemd/systemd/tree/m4/attributes.m4'>tree</a><a 
href='/systemd/systemd/commit/m4/attributes.m4'>commit</a><a 
href='/systemd/systemd/diff/m4/attributes.m4'>diff</a></td><td class='form'><form class='right' method='get' 
action='/systemd/systemd/log/m4/attributes.m4'>
+<select name='qt'>
+<option value='grep'>log msg</option>
+<option value='author'>author</option>
+<option value='committer'>committer</option>
+<option value='range'>range</option>
+</select>
+<input class='txt' type='text' size='10' name='q' value=''/>
+<input type='submit' value='search'/>
+</form>
+</td></tr></table>
+<div class='path'>path: <a href='/systemd/systemd/tree/'>root</a>/<a 
href='/systemd/systemd/tree/m4'>m4</a>/<a 
href='/systemd/systemd/tree/m4/attributes.m4'>attributes.m4</a></div><div class='content'>blob: 
aa53ef238027826b3f8d2d24fea27cc18c6aee71 (<a href='/systemd/systemd/plain/m4/attributes.m4'>plain</a>)
+<table summary='blob content' class='blob'>
+<tr><td class='linenumbers'><pre><a class='no' id='n1' name='n1' href='#n1'>1</a>
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+<a class='no' id='n227' name='n227' href='#n227'>227</a>
+<a class='no' id='n228' name='n228' href='#n228'>228</a>
+<a class='no' id='n229' name='n229' href='#n229'>229</a>
+<a class='no' id='n230' name='n230' href='#n230'>230</a>
+<a class='no' id='n231' name='n231' href='#n231'>231</a>
+<a class='no' id='n232' name='n232' href='#n232'>232</a>
+<a class='no' id='n233' name='n233' href='#n233'>233</a>
+<a class='no' id='n234' name='n234' href='#n234'>234</a>
+<a class='no' id='n235' name='n235' href='#n235'>235</a>
+<a class='no' id='n236' name='n236' href='#n236'>236</a>
+<a class='no' id='n237' name='n237' href='#n237'>237</a>
+<a class='no' id='n238' name='n238' href='#n238'>238</a>
+<a class='no' id='n239' name='n239' href='#n239'>239</a>
+<a class='no' id='n240' name='n240' href='#n240'>240</a>
+<a class='no' id='n241' name='n241' href='#n241'>241</a>
+<a class='no' id='n242' name='n242' href='#n242'>242</a>
+<a class='no' id='n243' name='n243' href='#n243'>243</a>
+<a class='no' id='n244' name='n244' href='#n244'>244</a>
+<a class='no' id='n245' name='n245' href='#n245'>245</a>
+<a class='no' id='n246' name='n246' href='#n246'>246</a>
+<a class='no' id='n247' name='n247' href='#n247'>247</a>
+<a class='no' id='n248' name='n248' href='#n248'>248</a>
+<a class='no' id='n249' name='n249' href='#n249'>249</a>
+<a class='no' id='n250' name='n250' href='#n250'>250</a>
+<a class='no' id='n251' name='n251' href='#n251'>251</a>
+<a class='no' id='n252' name='n252' href='#n252'>252</a>
+<a class='no' id='n253' name='n253' href='#n253'>253</a>
+<a class='no' id='n254' name='n254' href='#n254'>254</a>
+<a class='no' id='n255' name='n255' href='#n255'>255</a>
+<a class='no' id='n256' name='n256' href='#n256'>256</a>
+<a class='no' id='n257' name='n257' href='#n257'>257</a>
+<a class='no' id='n258' name='n258' href='#n258'>258</a>
+<a class='no' id='n259' name='n259' href='#n259'>259</a>
+<a class='no' id='n260' name='n260' href='#n260'>260</a>
+<a class='no' id='n261' name='n261' href='#n261'>261</a>
+<a class='no' id='n262' name='n262' href='#n262'>262</a>
+<a class='no' id='n263' name='n263' href='#n263'>263</a>
+<a class='no' id='n264' name='n264' href='#n264'>264</a>
+<a class='no' id='n265' name='n265' href='#n265'>265</a>
+<a class='no' id='n266' name='n266' href='#n266'>266</a>
+<a class='no' id='n267' name='n267' href='#n267'>267</a>
+<a class='no' id='n268' name='n268' href='#n268'>268</a>
+<a class='no' id='n269' name='n269' href='#n269'>269</a>
+<a class='no' id='n270' name='n270' href='#n270'>270</a>
+<a class='no' id='n271' name='n271' href='#n271'>271</a>
+<a class='no' id='n272' name='n272' href='#n272'>272</a>
+<a class='no' id='n273' name='n273' href='#n273'>273</a>
+<a class='no' id='n274' name='n274' href='#n274'>274</a>
+<a class='no' id='n275' name='n275' href='#n275'>275</a>
+<a class='no' id='n276' name='n276' href='#n276'>276</a>
+<a class='no' id='n277' name='n277' href='#n277'>277</a>
+<a class='no' id='n278' name='n278' href='#n278'>278</a>
+<a class='no' id='n279' name='n279' href='#n279'>279</a>
+<a class='no' id='n280' name='n280' href='#n280'>280</a>
+<a class='no' id='n281' name='n281' href='#n281'>281</a>
+<a class='no' id='n282' name='n282' href='#n282'>282</a>
+<a class='no' id='n283' name='n283' href='#n283'>283</a>
+<a class='no' id='n284' name='n284' href='#n284'>284</a>
+<a class='no' id='n285' name='n285' href='#n285'>285</a>
+<a class='no' id='n286' name='n286' href='#n286'>286</a>
+<a class='no' id='n287' name='n287' href='#n287'>287</a>
+<a class='no' id='n288' name='n288' href='#n288'>288</a>
+</pre></td>
+<td class='lines'><pre><code>dnl Macros to check the presence of generic (non-typed) symbols.
+dnl Copyright (c) 2006-2008 Diego Pettenò &lt;flameeyes gmail com&gt;
+dnl Copyright (c) 2006-2008 xine project
+dnl Copyright (c) 2012 Lucas De Marchi &lt;lucas de marchi gmail com&gt;
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2, or (at your option)
+dnl any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+dnl 02110-1301, USA.
+dnl
+dnl As a special exception, the copyright owners of the
+dnl macro gives unlimited permission to copy, distribute and modify the
+dnl configure scripts that are the output of Autoconf when processing the
+dnl Macro. You need not follow the terms of the GNU General Public
+dnl License when using or distributing such scripts, even though portions
+dnl of the text of the Macro appear in them. The GNU General Public
+dnl License (GPL) does govern all other use of the material that
+dnl constitutes the Autoconf Macro.
+dnl
+dnl This special exception to the GPL applies to versions of the
+dnl Autoconf Macro released by this project. When you make and
+dnl distribute a modified version of the Autoconf Macro, you may extend
+dnl this special exception to the GPL to apply to your modified version as
+dnl well.
+
+dnl Check if FLAG in ENV-VAR is supported by compiler and append it
+dnl to WHERE-TO-APPEND variable
+dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
+
+AC_DEFUN([CC_CHECK_FLAG_APPEND], [
+  AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
+                 AS_TR_SH([cc_cv_$2_$3]),
+          [eval "AS_TR_SH([cc_save_$2])='${$2}'"
+           eval "AS_TR_SH([$2])='-Werror $3'"
+           AC_LINK_IFELSE([AC_LANG_SOURCE([int a = 0; int main(void) { return a; } ])],
+                          [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
+                          [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
+           eval "AS_TR_SH([$2])='$cc_save_$2'"])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes],
+        [eval "$1='${$1} $3'"])
+])
+
+dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
+AC_DEFUN([CC_CHECK_FLAGS_APPEND], [
+  for flag in $3; do
+    CC_CHECK_FLAG_APPEND($1, $2, $flag)
+  done
+])
+
+dnl Check if the flag is supported by linker (cacheable)
+dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+
+AC_DEFUN([CC_CHECK_LDFLAGS], [
+  AC_CACHE_CHECK([if $CC supports $1 flag],
+    AS_TR_SH([cc_cv_ldflags_$1]),
+    [ac_save_LDFLAGS="$LDFLAGS"
+     LDFLAGS="$LDFLAGS $1"
+     AC_LINK_IFELSE([int main() { return 1; }],
+       [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
+       [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
+     LDFLAGS="$ac_save_LDFLAGS"
+    ])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
+    [$2], [$3])
+])
+
+dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for
+dnl the current linker to avoid undefined references in a shared object.
+AC_DEFUN([CC_NOUNDEFINED], [
+  dnl We check $host for which systems to enable this for.
+  AC_REQUIRE([AC_CANONICAL_HOST])
+
+  case $host in
+     dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads
+     dnl are requested, as different implementations are present; to avoid problems
+     dnl use -Wl,-z,defs only for those platform not behaving this way.
+     *-freebsd* | *-openbsd*) ;;
+     *)
+        dnl First of all check for the --no-undefined variant of GNU ld. This allows
+        dnl for a much more readable commandline, so that people can understand what
+        dnl it does without going to look for what the heck -z defs does.
+        for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do
+           CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"])
+           break
+        done
+     ;;
+  esac
+
+  AC_SUBST([LDFLAGS_NOUNDEFINED])
+])
+
+dnl Check for a -Werror flag or equivalent. -Werror is the GCC
+dnl and ICC flag that tells the compiler to treat all the warnings
+dnl as fatal. We usually need this option to make sure that some
+dnl constructs (like attributes) are not simply ignored.
+dnl
+dnl Other compilers don't support -Werror per se, but they support
+dnl an equivalent flag:
+dnl  - Sun Studio compiler supports -errwarn=%all
+AC_DEFUN([CC_CHECK_WERROR], [
+  AC_CACHE_CHECK(
+    [for $CC way to treat warnings as errors],
+    [cc_cv_werror],
+    [CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror],
+      [CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])])
+    ])
+])
+
+AC_DEFUN([CC_CHECK_ATTRIBUTE], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))],
+    AS_TR_SH([cc_cv_attribute_$1]),
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE([$3])],
+       [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"],
+       [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"])
+     CFLAGS="$ac_save_CFLAGS"
+    ])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes],
+    [AC_DEFINE(
+       AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1,
+         [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))]
+         )
+     $4],
+    [$5])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [
+  CC_CHECK_ATTRIBUTE(
+    [constructor],,
+    [void __attribute__((constructor)) ctor() { int a; }],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_FORMAT], [
+  CC_CHECK_ATTRIBUTE(
+    [format], [format(printf, n, n)],
+    [void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [
+  CC_CHECK_ATTRIBUTE(
+    [format_arg], [format_arg(printf)],
+    [char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [
+  CC_CHECK_ATTRIBUTE(
+    [visibility_$1], [visibility("$1")],
+    [void __attribute__((visibility("$1"))) $1_function() { }],
+    [$2], [$3])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_NONNULL], [
+  CC_CHECK_ATTRIBUTE(
+    [nonnull], [nonnull()],
+    [void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; 
}],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_UNUSED], [
+  CC_CHECK_ATTRIBUTE(
+    [unused], ,
+    [void some_function(void *foo, __attribute__((unused)) void *bar);],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [
+  CC_CHECK_ATTRIBUTE(
+    [sentinel], ,
+    [void some_function(void *foo, ...) __attribute__((sentinel));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [
+  CC_CHECK_ATTRIBUTE(
+    [deprecated], ,
+    [void some_function(void *foo, ...) __attribute__((deprecated));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_ALIAS], [
+  CC_CHECK_ATTRIBUTE(
+    [alias], [weak, alias],
+    [void other_function(void *foo) { }
+     void some_function(void *foo) __attribute__((weak, alias("other_function")));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_MALLOC], [
+  CC_CHECK_ATTRIBUTE(
+    [malloc], ,
+    [void * __attribute__((malloc)) my_alloc(int n);],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_PACKED], [
+  CC_CHECK_ATTRIBUTE(
+    [packed], ,
+    [struct astructure { char a; int b; long c; void *d; } __attribute__((packed));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_CONST], [
+  CC_CHECK_ATTRIBUTE(
+    [const], ,
+    [int __attribute__((const)) twopow(int n) { return 1 &lt;&lt; n; } ],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_FLAG_VISIBILITY], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
+    [cc_cv_flag_visibility],
+    [cc_flag_visibility_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
+     cc_cv_flag_visibility='yes',
+     cc_cv_flag_visibility='no')
+     CFLAGS="$cc_flag_visibility_save_CFLAGS"])
+
+  AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
+    [AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
+       [Define this if the compiler supports the -fvisibility flag])
+     $1],
+    [$2])
+])
+
+AC_DEFUN([CC_FUNC_EXPECT], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if compiler has __builtin_expect function],
+    [cc_cv_func_expect],
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+       [int some_function() {
+        int a = 3;
+        return (int)__builtin_expect(a, 3);
+     }])],
+       [cc_cv_func_expect=yes],
+       [cc_cv_func_expect=no])
+     CFLAGS="$ac_save_CFLAGS"
+    ])
+
+  AS_IF([test "x$cc_cv_func_expect" = "xyes"],
+    [AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1,
+     [Define this if the compiler supports __builtin_expect() function])
+     $1],
+    [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported],
+    [cc_cv_attribute_aligned],
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     for cc_attribute_align_try in 64 32 16 8 4 2; do
+        AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+          int main() {
+            static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
+            return c;
+          }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
+     done
+     CFLAGS="$ac_save_CFLAGS"
+  ])
+
+  if test "x$cc_cv_attribute_aligned" != "x"; then
+     AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned],
+       [Define the highest alignment supported])
+  fi
+])
+</code></pre></td></tr></table>
+</div> <!-- class=content -->
+<div class='footer'>generated  by cgit v0.9.0.2-2-gbebe at 2014-07-09 14:35:18 (GMT)</div>
+</div> <!-- id=cgit -->
+</body>
+</html>
diff --git a/acinclude.m4 b/m4/tracker.m4
similarity index 76%
rename from acinclude.m4
rename to m4/tracker.m4
index f481d84..bca646d 100644
--- a/acinclude.m4
+++ b/m4/tracker.m4
@@ -117,7 +117,7 @@ AC_DEFUN([IDT_COMPILE_WARNINGS],[
        enable_compile_warnings=no
     fi
 
-    warning_flags=
+    warning_cflags=
     warning_valaflags=
     realsave_CFLAGS="$CFLAGS"
 
@@ -127,41 +127,82 @@ AC_DEFUN([IDT_COMPILE_WARNINGS],[
     # 3. unfixable issues: -Wmissing-braces
     #
     # We don't want to see warnings about generated code.
-    common_from_Wall="-Waddress -Warray-bounds -Wchar-subscripts -Wenum-compare -Wimplicit-int 
-Wimplicit-function-declaration -Wcomment -Wformat -Wmain -Wmaybe-uninitialized -Wnonnull -Wparentheses 
-Wpointer-sign -Wreturn-type -Wsequence-point -Wsign-compare -Wstrict-aliasing -Wstrict-overflow=1 -Wswitch 
-Wtrigraphs -Wuninitialized -Wunknown-pragmas -Wvolatile-register-var"
+    CC_CHECK_FLAGS_APPEND([common_cflags], [CFLAGS], [\
+        -Waddress \
+        -Warray-bounds \
+        -Wchar-subscripts \
+        -Wenum-compare \
+        -Wimplicit-int \
+        -Wimplicit-function-declaration \
+        -Wcomment \
+        -Wformat \
+        -Wmain \
+        -Wmaybe-uninitialized \
+        -Wnonnull \
+        -Wparentheses \
+        -Wpointer-sign \
+        -Wreturn-type \
+        -Wsequence-point \
+        -Wsign-compare \
+        -Wstrict-aliasing \
+        -Wstrict-overflow=1 \
+        -Wswitch \
+        -Wtrigraphs \
+        -Wuninitialized \
+        -Wunknown-pragmas \
+        -Wvolatile-register-var \
+        ])
 
     case "$enable_compile_warnings" in
     no)
-       warning_flags=
+       warning_cflags=
        warning_valaflags=
        ;;
     yes)
-       warning_flags="-Wall -Wunused -Wmissing-prototypes -Wmissing-declarations"
-       warning_valaflags="$common_from_Wall -Wmissing-prototypes -Wmissing-declarations"
+        CC_CHECK_FLAGS_APPEND([additional_cflags], [CFLAGS], [\
+            -Wall \
+            -Wunused \
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+        ])
+
+        CC_CHECK_FLAGS_APPEND([additional_valaflags], [CFLAGS], [\
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+        ])
+
+        dnl -Wall includes the $common_cflags already.
+       warning_cflags="$additional_cflags"
+       warning_valaflags="$common_cflags $additional_valaflags"
        ;;
     maximum|error)
-       warning_flags="-Wall -Wunused -Wchar-subscripts -Wmissing-declarations -Wmissing-prototypes 
-Wnested-externs -Wpointer-arith"
-       warning_valaflags="$common_from_Wall -Wmissing-prototypes -Wmissing-declarations -Wnested-externs 
-Wpointer-arith"
-
-       CFLAGS="$warning_flags $CFLAGS"
-       for option in -Wno-sign-compare -Wno-pointer-sign; do
-               SAVE_CFLAGS="$CFLAGS"
-               CFLAGS="$CFLAGS $option"
-               AC_MSG_CHECKING([whether gcc understands $option])
-               AC_TRY_COMPILE([], [],
-                       has_option=yes,
-                       has_option=no,)
-               CFLAGS="$SAVE_CFLAGS"
-               AC_MSG_RESULT($has_option)
-               if test $has_option = yes; then
-                 warning_flags="$warning_flags $option"
-                 warning_valaflags="$warning_valaflags $option"
-               fi
-               unset has_option
-               unset SAVE_CFLAGS
-       done
-       unset option
+        CC_CHECK_FLAGS_APPEND([additional_cflags], [CFLAGS], [\
+            -Wall \
+            -Wunused \
+            -Wchar-subscripts \
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+            -Wnested-externs \
+            -Wpointer-arit \
+            -Wno-sign-compare \
+            -Wno-pointer-sign \
+        ])
+
+        CC_CHECK_FLAGS_APPEND([additional_valaflags], [CFLAGS], [\
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+            -Wnested-externs \
+            -Wpointer-arith \
+            -Wno-sign-compare \
+            -Wno-pointer-sign \
+        ])
+
+        dnl -Wall includes the $common_cflags already.
+       warning_cflags="$additional_cflags"
+       warning_valaflags="$common_cflags $additional_valaflags"
+
        if test "$enable_compile_warnings" = "error" ; then
-           warning_flags="$warning_flags -Werror"
+           warning_cflags="$warning_cflags -Werror"
            warning_valaflags="$warning_valaflags -Werror"
        fi
        ;;
@@ -171,12 +212,12 @@ AC_DEFUN([IDT_COMPILE_WARNINGS],[
     esac
     CFLAGS="$realsave_CFLAGS"
     AC_MSG_CHECKING(what warning flags to pass to the C compiler)
-    AC_MSG_RESULT($warning_flags)
+    AC_MSG_RESULT($warning_cflags)
 
     AC_MSG_CHECKING(what warning flags to pass to the C compiler for Vala built sources)
     AC_MSG_RESULT($warning_valaflags)
 
-    WARN_CFLAGS="$warning_flags"
+    WARN_CFLAGS="$warning_cflags"
     AC_SUBST(WARN_CFLAGS)
 
     WARN_VALACFLAGS="$warning_valaflags"
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