Merge r169768 - [GTK][gtkdoc] remove -Wcast-align

https://bugs.webkit.org/show_bug.cgi?id=133640

Apparently gcc warns that GParamSpec is not castable to
GParamSpecInt64/GParamSpecUInt64/GParamSpecDouble due they are 64bit, even
though ARM hackers claim that those only need 4byte alignment. As long as gcc
behaves that way, this warning is not very useful, also they break the Debian
packaging.

This patch appends the compiler flag -Wno-align-cast for the gtkdoc
scanner compilation, thus the compiler ignores the previous
-Waling-cast flag.

Reviewed by Martin Robinson.

* gtk/generate-gtkdoc:
(get_generator_for_config):

Tools/ChangeLog

@@ -1,3 +1,23 @@
+2014-06-10  Víctor Manuel Jáquez Leal  <vjaquez@igalia.com>
+
+        [GTK][gtkdoc] remove -Wcast-align
+        https://bugs.webkit.org/show_bug.cgi?id=133640
+
+        Apparently gcc warns that GParamSpec is not castable to
+        GParamSpecInt64/GParamSpecUInt64/GParamSpecDouble due they are 64bit, even
+        though ARM hackers claim that those only need 4byte alignment. As long as gcc
+        behaves that way, this warning is not very useful, also they break the Debian
+        packaging.
+
+        This patch appends the compiler flag -Wno-align-cast for the gtkdoc
+        scanner compilation, thus the compiler ignores the previous
+        -Waling-cast flag.
+
+        Reviewed by Martin Robinson.
+
+        * gtk/generate-gtkdoc:
+        (get_generator_for_config):
+
 2014-05-30  Mario Sanchez Prada  <mario.prada@samsung.com>
 
         [ATK] Deprecate usage of logAccessibilityEvents() in layout tests

Tools/gtk/generate-gtkdoc

@@ -166,6 +166,12 @@ def prepare_environment_for_gtkdoc_generation():
     # to compile it.
     cflags = os.environ.get('CFLAGS', '')
     cflags += ' -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_32'
+
+    # In non-x86 architectures, when a pointer is cast to (void*) and
+    # back, the compiler thinks that the alignment is random. Since
+    # gtkdoc build is broken at any warning message, it is better to
+    # silence these false positives.
+    cflags += ' -Wno-cast-align'
     os.environ['CFLAGS'] = cflags
 
     # Clang can be noisy, throwing unnecessary warnings for unused arguments.