Attached patches fixes most gcc warnings in code (apply in this order):
gail-strict-aliasing.patch: Fixes code for latest gcc aliasing analysis.
gail-void.patch: Fixed void functions declarations.
gail-errors.patch: Fixes code error (gcc warning).
gail-uninitialized.patch: Fixes potentially uninitialized variables.
gail-unused-vars.patch: Removes uninitialized variables.
gail-unused-func.patch: Removes uninitialized functions.
gail-warn.patch: Fixes minor warnings.

Not yet fixed warnings:
gaillabel.c: In function `gail_label_ref_relation_set':
gaillabel.c:500: warning: assignment from incompatible pointer type
gaillabel.c: In function `gail_label_real_notify_gtk':
gaillabel.c:315: warning: `top_level' might be used uninitialized in this function
testlib.c: In function `get_arg_of_func':
testlib.c:836: warning: `retString' might be used uninitialized in this function