Re: [yocto] enabling symbols for debug in clinfo

Re: [yocto] enabling symbols for debug in clinfo

[Quentin Schulz]

Hi Steve,

On 5/9/22 12:54, Monsees, Steven C (US) via lists.yoctoproject.org wrote:
> 
> Hello:
> 
> I'd like to build clinfo w/ "-g" option to do some debugging with GDB...
> 
> I am looking at: meta-openembedded/meta-oe/recipes-support/opencl/clinfo_2.2.18.04.06.bb
> 
> I created a "bbapend" file to modify the build recipes "Makefile.am" file prior to build, to introduce '-g' for CFLAGS & CPPFLAGS, i.e. at top of Makefile.am added:
> 
>                  AM_CFLAGS - -g
>                  AM_CPPFLAGS = -g
> 
> I checked the build tree and see my modified "Makefile.am" updated as expected, the update occurs at the end of the install process, using do_install_append... so the build should have used my modified file... but I do not have symbols for the clinfo package when I go to use GDB.
> 

The install task runs after the software has been built. It is therefore 
expected your changes aren't actually taken into account.

c.f. https://docs.yoctoproject.org/ref-manual/tasks.html#do-install, I 
guess it is not THAT obvious that it happens after compilation. Maybe a 
patch to the documentation would help clear things out.

You shouldn't need to modify the makefile and just add "-g" to 
TARGET_CFLAGS/ TARGET_CXXFLAGS or CFLAGS/CXXFLAGS in your recipe.

Also, I have never used it but we do have support for debuginfod which 
should make it easier to debug remotely without installing the binary 
with debug symbols, c.f. 
https://docs.yoctoproject.org/dev-manual/common-tasks.html#debugging-with-the-gnu-project-debugger-gdb-remotely

Cheers,
Quentin

Re: [yocto] enabling symbols for debug in clinfo

[Ross Burton]

Unless clinfo is doing something wrong, it will be built with -g anyway.  You’ll just need to install clinfo-dbg to get the symbols, as they’ll be split out into a separate package during packaging.

Ross

> On 9 May 2022, at 11:54, Monsees, Steven C (US) via lists.yoctoproject.org <steven.monsees=baesystems.com@lists.yoctoproject.org> wrote:
>
>
> Hello:
>
> I’d like to build clinfo w/ “-g” option to do some debugging with GDB…
>
> I am looking at: meta-openembedded/meta-oe/recipes-support/opencl/clinfo_2.2.18.04.06.bb
>
> I created a “bbapend” file to modify the build recipes “Makefile.am” file prior to build, to introduce ‘-g’ for CFLAGS & CPPFLAGS, i.e. at top of Makefile.am added:
>
>                 AM_CFLAGS - -g
>                 AM_CPPFLAGS = -g
>
> I checked the build tree and see my modified “Makefile.am” updated as expected, the update occurs at the end of the install process, using do_install_append… so the build should have used my modified file… but I do not have symbols for the clinfo package when I go to use GDB.
>
> Is there a simple way to enable debug symbols for this package ?
>
> Did I modify the wrong configuration file?, Should I be modifying configure ?
>
> I am new to auto-build configurations…
> Could someone tell me the easiest way to add “-g” to the clinfo standard build ?
>
> Thanks,
> Steve
>
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RE: [yocto] enabling symbols for debug in clinfo

[Monsees, Steven C (US)]

I will need to test but, that appears to have done the trick...


root@sbcb-default gdb clinfo
GNU gdb (GDB) 8.3.1
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-poky-linux".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from clinfo...
Reading symbols from /usr/bin/.debug/clinfo...
(gdb)

Thanks
Steve

-----Original Message-----
From: yocto@lists.yoctoproject.org <yocto@lists.yoctoproject.org> On Behalf Of Ross Burton
Sent: Monday, May 9, 2022 7:56 AM
To: Monsees, Steven C (US) <steven.monsees@baesystems.com>
Cc: yocto@lists.yoctoproject.org
Subject: Re: [yocto] enabling symbols for debug in clinfo

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Unless clinfo is doing something wrong, it will be built with -g anyway.  You’ll just need to install clinfo-dbg to get the symbols, as they’ll be split out into a separate package during packaging.

Ross

> On 9 May 2022, at 11:54, Monsees, Steven C (US) via lists.yoctoproject.org <steven.monsees=baesystems.com@lists.yoctoproject.org> wrote:
>
>
> Hello:
>
> I’d like to build clinfo w/ “-g” option to do some debugging with GDB…
>
> I am looking at: 
> meta-openembedded/meta-oe/recipes-support/opencl/clinfo_2.2.18.04.06.b
> b
>
> I created a “bbapend” file to modify the build recipes “Makefile.am” file prior to build, to introduce ‘-g’ for CFLAGS & CPPFLAGS, i.e. at top of Makefile.am added:
>
>                 AM_CFLAGS - -g
>                 AM_CPPFLAGS = -g
>
> I checked the build tree and see my modified “Makefile.am” updated as expected, the update occurs at the end of the install process, using do_install_append… so the build should have used my modified file… but I do not have symbols for the clinfo package when I go to use GDB.
>
> Is there a simple way to enable debug symbols for this package ?
>
> Did I modify the wrong configuration file?, Should I be modifying configure ?
>
> I am new to auto-build configurations… Could someone tell me the 
> easiest way to add “-g” to the clinfo standard build ?
>
> Thanks,
> Steve
>
> 

IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.