Initial gtk3 support

build/linux/system.gyp

Index: build/linux/system.gyp
diff --git a/build/linux/system.gyp b/build/linux/system.gyp
index a1d6bf0a1bcdca2f442d016b102fd5b6adb6e835..7080659aadd5b26e1ecd25768817faa180a55d99 100644
--- a/build/linux/system.gyp
+++ b/build/linux/system.gyp
@@ -113,15 +113,15 @@
             ['_toolset=="target"', {
               'direct_dependent_settings': {
                 'cflags': [
-                  '<!@(<(pkg-config) --cflags gdk-2.0)',

[Elliot Glaysher, 2015/07/20 19:31:40]

Please don't do this. We need to support both GTK 2 and 3 in the same build.
Instead make a 'gdk2' and 'gdk3' targets, have libgtk2ui depend on gdk2 (&etc)
and have libgtk3ui depend on gdk3 (&etc).

[knthzh, 2015/07/21 15:48:27]

I can't. I'm too terrified of triggering another eight-hour rebuild to touch the
build system.

[Elliot Glaysher, 2015/07/28 17:54:36]

(Just to be clear, I'm fine with you having this hack in while you're developing
the rest of the theme code, but this can not land as is; we need to be able to
continue to support gtk2 for the foreseeable future.)

+                  '<!@(<(pkg-config) --cflags gdk-3.0)',
                 ],
               },
               'link_settings': {
                 'ldflags': [
-                  '<!@(<(pkg-config) --libs-only-L --libs-only-other gdk-2.0)',
+                  '<!@(<(pkg-config) --libs-only-L --libs-only-other gdk-3.0)',
                 ],
                 'libraries': [
-                  '<!@(<(pkg-config) --libs-only-l gdk-2.0)',
+                  '<!@(<(pkg-config) --libs-only-l gdk-3.0)',
                 ],
               },
             }],
@@ -134,7 +134,7 @@
           'variables': {
             # gtk requires gmodule, but it does not list it as a dependency
             # in some misconfigured systems.
-            'gtk_packages': 'gmodule-2.0 gtk+-2.0 gthread-2.0',
+            'gtk_packages': 'gmodule-2.0 gtk+-3.0 gthread-2.0',
           },
           'conditions': [
             ['_toolset=="target"', {
@@ -175,15 +175,15 @@
             ['_toolset=="target"', {
               'direct_dependent_settings': {
                 'cflags': [
-                  '<!@(<(pkg-config) --cflags gtk+-unix-print-2.0)',
+                  '<!@(<(pkg-config) --cflags gtk+-unix-print-3.0)',
                 ],
               },
               'link_settings': {
                 'ldflags': [
-                  '<!@(<(pkg-config) --libs-only-L --libs-only-other gtk+-unix-print-2.0)',
+                  '<!@(<(pkg-config) --libs-only-L --libs-only-other gtk+-unix-print-3.0)',
                 ],
                 'libraries': [
-                  '<!@(<(pkg-config) --libs-only-l gtk+-unix-print-2.0)',
+                  '<!@(<(pkg-config) --libs-only-l gtk+-unix-print-3.0)',
                 ],
               },
             }],