Hi. 2017-05-24 17:21 GMT+09:00 Arnd Bergmann <arnd@xxxxxxxx>: > On Wed, May 24, 2017 at 2:04 AM, Matthias Kaehlcke <mka@xxxxxxxxxxxx> wrote: >> El Wed, May 17, 2017 at 11:45:29AM -0700 Matthias Kaehlcke ha dit: >>> El Wed, May 17, 2017 at 09:35:57AM +0200 Arnd Bergmann ha dit: >>> > On Tue, May 16, 2017 at 11:41 PM, Doug Anderson <dianders@xxxxxxxxxxxx> wrote: >> It seems the duplicate-decl-specifier warning targets specifically C89: >> >> "The same type qualifier shall not appear more than once in the same >> specifier list or qualifier list, either directly or via one or more >> typedefs." >> >> C89 (6.5.3) >> >> gcc also raises a warning when '-pedantic' is specified and >> -std=gnu89/c89 (or unspecified), but not with -std=gnu99/c99. >> >> This bug might help to shed more light on this: >> https://bugs.llvm.org/show_bug.cgi?id=32985 > > I also notice that neither compiler differentiates between a) > > typedef const int cint; > const cint i; > > and b) > const int i; > const typeof(a) j; > > I would have expected a warning for a) but not b), but both 'clang --std=gnu89' > and 'gcc --pedantic --std=gnu89' warn about both of b as well, and don't warn > for newer standards. > > Arnd I think we agreed to apply 1/2. How about 2/2? I think we mostly discussed preferable behavior of -Wduplicate-decl-specifier, but we did not come up with an idea to solve the problem for already shipped clang versions. (BTW, we have not defined the minimal supported version of clang yet.) -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
