Bootstrapped and regression tested on x86_64-linux-gnu. Since Wformat didn't have Var() associated, its corresponding entry was set to -1, which is what warning(OPT_Wformat) checks for. Therefore, any such warnings which were not guarded by if(warn_format), were enabled by default. I only found one case in the objective-C FE.
The old code accepts -Wformat=X with X any number but -Wno-format=2
does not have any effect. The documentation only mentions -Wformat,
-Wno-format, -Wformat=2 and -Wno-format=2. I followed the
documentation but I can also implement -Wformat=0 being an alias for
-Wno-format and -Wformat=1 an alias for -Wformat and simply reject
-Wno-format=.
2012-10-17 Manuel López-Ibáñez <m...@gcc.gnu.org>
PR c/53063
c-family/
* c.opt (Wformat, Wformat-extra-args, Wformat-nonliteral,
Wformat-contains-nul, Wformat-security, Wformat-y2k,
Wformat-zero-length, Wformat=2, Wnonnull): Use LangEnabledBy.
* c-opts.c (c_common_handle_option): Do not handle explicitly
here.
* c-common.c (warn_format): Delete.
* c-format.c (set_Wformat): Delete.
* c-common.h (warn_format,set_Wformat): Do not declare.
testsuite/
* gcc.dg/warn-nsstring.c: Add -Wformat.
* gcc.misc-tests/help.exp (check_for_options): Use
-Wstrict-aliasing for test.
wformat.diff
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