[gimp] Add some extra compiler warnings to CFLAGS

[Mukund Sivaraman <muks src gnome org>]

commit f47645dc51d2b1b27afa32cfab54abb2e59570e8
Author: Mukund Sivaraman <muks banu com>
Date:   Fri Mar 18 22:16:31 2011 +0530

    Add some extra compiler warnings to CFLAGS

 configure.ac |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index cf60fa8..c59b9af 100644
--- a/configure.ac
+++ b/configure.ac
@@ -338,6 +338,9 @@ CFLAGS="$CFLAGS $extra_warnings"
 GIMP_DETECT_CFLAGS(extra_warnings, '-Wmissing-declarations')
 CFLAGS="$CFLAGS $extra_warnings"
 
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wredundant-decls')
+CFLAGS="$CFLAGS $extra_warnings"
+
 GIMP_DETECT_CFLAGS(extra_warnings, '-Winit-self')
 CFLAGS="$CFLAGS $extra_warnings"
 
@@ -356,6 +359,24 @@ CFLAGS="$CFLAGS $extra_warnings"
 GIMP_DETECT_CFLAGS(extra_warnings, '-Wformat-non-literal')
 CFLAGS="$CFLAGS $extra_warnings"
 
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wundef')
+CFLAGS="$CFLAGS $extra_warnings"
+
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wshadow')
+CFLAGS="$CFLAGS $extra_warnings"
+
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wlogical-op')
+CFLAGS="$CFLAGS $extra_warnings"
+
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wendif-labels')
+CFLAGS="$CFLAGS $extra_warnings"
+
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wcast-align')
+CFLAGS="$CFLAGS $extra_warnings"
+
+GIMP_DETECT_CFLAGS(extra_warnings, '-Wwrite-strings')
+CFLAGS="$CFLAGS $extra_warnings"
+
 
 # Ensure MSVC-compatible struct packing convention is used when
 # compiling for Win32 with gcc.