------- Comment #3 from joseph at codesourcery dot com 2010-04-06 14:14 ------- Subject: Re: add warning for duplicate qualifier
It is generally presumed that if a new feature is deliberately added in a new language version, as with duplicate qualifiers in C99, then it is useful for it to be allowed with previous versions and not diagnosed by default but only with -pedantic. The possibility of generally being able to warn for C90/C99 compatibility issues whichever mode the compiler is in (-Wc90-c99-compat, say) is a separate issue. I think the reason duplicate qualifiers are allowed in C99 is to allow you to use volatile with a typedef name without knowing whether that typedef already includes volatile, for example. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43651
