[LLVMdev] question on the status of debugging symbols

[Bagel]

Would someone be so kind as to tell me what the status of debugging symbols
(DWARF) generated by clang/llvm is?

I am on a linux x86-64 system (Fedora 13). Is gdb supposed to understand the
generated DWARF?

When I generate an executable with "clang -g" followed by "llc -O0" and feed it
to gdb, I get "no debugging symbols found".

What is the status of lldb on linux?

thanks,
bagel

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[Renato Golin]

On 23 November 2010 18:03, Bagel <bag...@gmail.com> wrote:
> Would someone be so kind as to tell me what the status of debugging symbols
> (DWARF) generated by clang/llvm is?

Hi Bagel,

It should be fairly complete...

> When I generate an executable with "clang -g" followed by "llc -O0" and feed it
> to gdb, I get "no debugging symbols found".
>
> What is the status of lldb on linux?

Just ran the same thing and got all symbols, can you show your
specific command line options?

I did:

$ clang -S -g -emit-llvm test.c -o test.ll
$ llc -O0 test.ll -o test.s
$ gcc test.s -o test
$ gdb ./test

Also works:

$ clang -S -g test.c -o test.s
$ gcc test.s -o test
$ gdb ./test

etc.

cheers,
--renato

[Xinfinity]

Maybe you have to install LLVM in Debug+Assertions mode, not in Release mode.
Alexandra

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[Tobias Grosser]

On 11/24/2010 06:15 AM, Renato Golin wrote:
> On 23 November 2010 18:03, Bagel<bag...@gmail.com> wrote:
>> Would someone be so kind as to tell me what the status of debugging symbols
>> (DWARF) generated by clang/llvm is?
>
> Hi Bagel,
>
> It should be fairly complete...

I believe their is a huge regression with gdb 7.2. Ubuntu 10.10 just
switched to it and it seems I cannot use ">call function" in gdb to call
many C++ functions compiled with clang. Most of the time I get:

"Cannot evaluate function -- may be inlined"

I did not try clang from today, but a couple of weeks ago this still
failed and the corresponding bug report is not yet closed:

http://llvm.org/bugs/show_bug.cgi?id=8045

I believe I figured out what the problem was. I also created a reduced
test case, but did not have the time to obtain the knowledge to fix it.
Maybe someone with DWARF knowledge could have a look?

Tobi