llvm dev - Apr 2021 - [cfe-dev] Debuginfo for alias variable /func is not emited.

Sure, looks like an omission/bug/missing debug info to me. I don't see
any tests in clang for debug info IR emission that include "alias", so
Iguess it's not implemented at all. I vaguely thought it was, but
probably misremembering.

On Tue, Apr 20, 2021 at 6:48 AM Umesh Kalappa via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
>
> Hi All ,
>
> We have a stitution with clang ,where the debuginfo for alias variable
> /func is not emitted i.e
>
> $cat test.c
> int oldname = 1;
> extern int newname __attribute__((alias("oldname")));
> $clang -g -O0 test.c
> $gdb a.out
> (gdb) pt oldname
> type = int
> (gdb) pt newname
> type = <data variable, no debug info>
>
> and we can fix the same ,by adding the DIGlobalVariable for alias too .
>
> Before we go-ahead and make the changes ,we would like experts to
> confirm these gaps and their comments on the same .
>
> Thank you
> ~Umesh
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev

> Sure, looks like an omission/bug/missing debug info to me. I don't see
> any tests in clang for debug info IR emission that include
"alias", so
> Iguess it's not implemented at all. I vaguely thought it was, but
> probably misremembering.
I can't get newname even with a use, or -fstandalone-debug.

Umesh, if you're willing to generate a patch, that would be wonderful.
Or if you can't, please file a bug.
Thanks,
--paulr
> 
> On Tue, Apr 20, 2021 at 6:48 AM Umesh Kalappa via cfe-dev
> <cfe-dev at lists.llvm.org> wrote:
> >
> > Hi All ,
> >
> > We have a stitution with clang ,where the debuginfo for alias variable
> > /func is not emitted i.e
> >
> > $cat test.c
> > int oldname = 1;
> > extern int newname __attribute__((alias("oldname")));
> > $clang -g -O0 test.c
> > $gdb a.out
> > (gdb) pt oldname
> > type = int
> > (gdb) pt newname
> > type = <data variable, no debug info>
> >
> > and we can fix the same ,by adding the DIGlobalVariable for alias too
.
> >
> > Before we go-ahead and make the changes ,we would like experts to
> > confirm these gaps and their comments on the same .
> >
> > Thank you
> > ~Umesh
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at lists.llvm.org
> > https://urldefense.com/v3/__https://lists.llvm.org/cgi-
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