On Wed, 31 Aug 2022, Qing Zhao via Gcc-patches wrote: > > "a GNU extension" suggests a particular language feature, but I think > > you're actually referring here to a whole language version rather than an > > individual feature. > > Is “not supported by GNU extension GNU89” better?
There are no existing diagnostics referring to GNU89 at all. I don't think "GNU extension" needs to be mentioned in that diagnostic, but I also think that having that diagnostic at all is ill-conceived. > > In any case, -std=gnu89 supports flexible array members. > > Yes, but only [0],[1] are supported as flexible array members. The C99 > flexible array member [] is not supported by GNU89, right? C99 flexible array members are fully supported in GNU89 mode. In general, any feature from a new language version that doesn't affect code that was valid in previous versions is likely to be accepted as an extension with options for older language versions. -- Joseph S. Myers jos...@codesourcery.com
