enable clang suppott

chromium-browser-stable.spec

@@ -5,6 +5,7 @@
 %define _src %{_topdir}/SOURCES
 
 %define chromium_system_libs 0
+%define clang 1
 
 Summary:	A fast web browser based on the Blink engine
 Name:		chromium-browser-stable
@@ -87,6 +88,10 @@ BuildRequires:	pkgconfig(xt)
 BuildRequires:	pkgconfig(xtst)
 BuildRequires:	pkgconfig(zlib)
 
+%if 0%{?clang}
+BuildRequires:  clang
+%endif
+
 Suggests:	chromium-browser-pepper-flash
 Suggests:	chromium-widevinecdm-plugin
 Conflicts:	chromium-browser-beta
@@ -212,7 +217,6 @@ buildconfig+="-Dwerror=
 		-Dlinux_fpic=1
 		-Ddisable_sse2=1
 		-Dcomponent=shared_library
-		-Dclang=0
 		-Dtoolkit_uses_gtk=0
 		-Dffmpeg_branding=Chrome
 		-Ddisable_nacl=1
@@ -224,6 +228,13 @@ buildconfig+="-Dwerror=
 		-Duse_aura=1
 		-Denable_widevine=1"
 
+%if 0%{?clang}
+buildconfig+="-Dclang=1
+                -Dclang_use_chrome_plugins=0"
+%else
+buildconfig+=" -Dclang=0"
+%endif
+
 %if 0%{?chromium_system_libs}
 buildconfig+=" -Duse_system_flac=1
 		-Duse_system_speex=1
@@ -279,6 +290,16 @@ buildconfig+=" -Duse_system_icu=0
 		-Dgoogle_default_client_id=4139804441.apps.googleusercontent.com
 		-Dgoogle_default_client_secret=KDTRKEZk2jwT_7CDpcmMA--P"
 
+%if 0%{?clang}
+export CC=/usr/bin/clang
+export CXX=/usr/bin/clang++
+# Modern Clang produces a *lot* of warnings 
+export CXXFLAGS="${CXXFLAGS} -Wno-unknown-warning-option -Wno-unused-local-typedef -Wunknown-attributes -Wno-tautological-undefined-compare"
+export GYP_DEFINES="clang=1 enable_hidpi=1 enable_touch_ui=1 enable_hotwording=0"
+%else
+export GYP_DEFINES="enable_hidpi=1 enable_touch_ui=1 enable_hotwording=0"
+%endif
+
 build/linux/unbundle/replace_gyp_files.py $buildconfig
 
 export GYP_GENERATORS='ninja'