[PATCH] pointer cast warnings when size matches

[Devang Patel <dpatel at apple dot com>]

This patch updates -Wint-to-pointer-cast and -Wpointer-to-int-cast  
options to accept value to enable warnings when size matches. New  
attribute safe_pointer_cast is available to suppress such warnings  
for selected integral types.

        * c.opt (Wint-to-pointer-cast=, Wpointer-to-int-cast=): New.
        * c-typeck.c (build_c_cast): Check warn_pointer_to_int_cast  
value.
        Check warn_int_to_pointer_cast value.
        * c-opts.c (c_common_handle_option): Handle  
OPT_Wint_to_pointer_cast,
        OPT_Wint_to_pointer_cast_, OPT_Wpointer_to_int_cast,
        OPT_Wpointer_to_int_cast_.
        * c-common.c (handle_safe_ponter_cast_attribute): New.
        (c_common_attribute): Add entry for safe_pointer_cast.

        * doc/invoke.texi: Document -Wpointer-to-int-cast=2 and
        -Wint-to-pointer-cast=2.
        * doc/extend.texi: Document safe_pointer_cast attribute.

        * gcc.dg/Wpointer-to-int-cast-4.c: New test.
        * gcc.dg/Wpointer-to-int-cast-5.c: New test.
        * gcc.dg/Wint-to-pointer-cast-4.c: New test.
        * gcc.dg/Wint-to-pointer-cast-5.c: New test.

Bootstrapped and tested on powerpc-apple-darwin.
OK?
Thanks,
-
Devang

:ADDPATCH C:

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