problem with ccflags := -Werror in Makefiles when building with gcc 4.6.0

[Douglas Mencken]

When building with gcc 4.6.0 with the new type of warnings introduced,
-Wunused-but-set-variable, many directories with ccflags set to
-Werror in Makefile fail to build.

Example:
> arch/powerpc/kernel/align.c:704:33: error: variable 'instruction' set but not used [-Werror=unused-but-set-variable]
> cc1: all warnings being treated as errors

I'm currently using the following workaround to get rid of `-Werror':

list_of_makefiles=`find . -name Makefile -print0 | xargs -0 grep -H
"ccflags" | grep "\-Werror" | \
                   sed "s/Makefile:/Makefile@\t/g" | cut -d'@' -f1`
echo "${list_of_makefiles}" | while read the_makefile
do
  sed -i 's/-Werror//g' "${the_makefile}"
done

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