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

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

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
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> cfe-dev at lists.llvm.org
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