[cfe-dev] warning: declaration does not declare anything / error: no member named 'LOW' in 'STRUCT'

[Richard Smith via cfe-dev]

Would it make sense to add a -fplan9-extensions flag, to enable support for
this without enabling all the other MS extensions that we support?

On Mon, 30 Jul 2018 at 11:53, Friedman, Eli via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> On 7/30/2018 9:08 AM, Frank Redeker via cfe-dev wrote:
> > Hello List,
> >
> > Given the following piece of code.
> >
> > typedef union {
> >       struct {
> >               unsigned char   LOW;
> >               unsigned char   HIGH;
> >       };
> >       unsigned short  SHORT;
> > } UNION;
> >
> > typedef struct {
> >       UNION; // <-- use of type only
> >       union {
> >               unsigned char   FOO;
> >       };
> > } STRUCT;
> >
> > STRUCT        Variable;
> >
> > void Function () {
> >       Variable.LOW = 1;
> > }
> >
> >
> > This code compiles without any error using gcc 7.2 (When compiling with
> > -ansi -pedantic I get the warning "ISO C90 doesn't support unnamed
> > structs/unions". If I add -std=c11 the warning disappears)
>
> Declaring an anonymous union like that non-standard; you need to pass
> -fms-extensions.
>
> -Eli
>
> --
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
> Foundation Collaborative Project
>
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