HELP!!How to add a testing case to check a compilation time warning for "cc1"

HELP!!How to add a testing case to check a compilation time warning for "cc1"

[Qing Zhao]

Hi,

My private cc1 issued the following warning:

[opc@qinzhao-ol8u3-x86 gcc]$ sh t
cc1: warning: ‘-fstrict-flex-arrays’ is not supported with a ISO C before C99, ignored


I’d like to add a testing case for this warning into gcc.dg directory, however, I cannot find a proper
testing directive to catch this warning (which is not associated with any source line, so “dg-warning” didn’t work)

I checked online internal doc: https://gcc.gnu.org/onlinedocs/gcc-12.1.0/gccint/Test-Directives.html
Cannot find one.

Does anyone know how to do this?

Thanks a lot for your help.

Qing

Re: HELP!!How to add a testing case to check a compilation time warning for "cc1"

[Qing Zhao]

Never mind, just found how to do this:

/* { dg-warning "'-fstrict-flex-arrays' is not supported with a ISO C before C99, ignored" ""  { target *-*-* } 0 } */

And worked.

thanks.

Qing
> On Aug 3, 2022, at 2:52 PM, Qing Zhao via Gcc-patches <gcc-patches@gcc.gnu.org> wrote:
> 
> Hi,
> 
> My private cc1 issued the following warning:
> 
> [opc@qinzhao-ol8u3-x86 gcc]$ sh t
> cc1: warning: ‘-fstrict-flex-arrays’ is not supported with a ISO C before C99, ignored
> 
> 
> I’d like to add a testing case for this warning into gcc.dg directory, however, I cannot find a proper
> testing directive to catch this warning (which is not associated with any source line, so “dg-warning” didn’t work)
> 
> I checked online internal doc: https://gcc.gnu.org/onlinedocs/gcc-12.1.0/gccint/Test-Directives.html
> Cannot find one.
> 
> Does anyone know how to do this?
> 
> Thanks a lot for your help.
> 
> Qing