Re: [PATCH 01/17] conf/bitbake.conf package.bbclass: fix dbg package not contain sources while -fdebug-prefix-map used

[Hongxu Jia <hongxu.jia@windriver.com>]

On 04/19/2016 08:31 PM, Mark Hatle wrote:
> On 4/19/16 2:33 AM, Hongxu Jia wrote:
>> Hi all,
>>
>> With some investigation, there is an example to explain how to do remote debug.
>>
>> Also file [YOCTO #9481] for document.
>>
>> Hi Andreas,
>>
>> Would you please have a look the example, to see if it could fit your case.
>>
>> Example:
>>
>> 1. Build a image with gdbserver and gzip installed. The gzip
>>     is the debug binary. Append the following to local.conf
>> ...
>> IMAGE_INSTALL_append = " gdbserver gzip"
>> ...
>>
>> $ bitbake core-image-sato
>>
>> 2. Build gdb-cross for remote debug on host
>>
>> $ bitbake gdb-cross-i586
>>
>> 3. start qemu
>>
>> $ runqemu qemux86 core-image-sato
>>
>> 4. On host side, create symlink /usr/src/debug to
>>     ${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS} which the
>>     location of sources is /usr/src/debug.
>>
>> $ ln -snf /TOPDIR/tmp/work/i586-poky-linux /usr/src/debug
> This is incorrect.  On the host you use the combination of:
>
> (gdb) set sysroot <your debug capable fs path>
> (gdb) set substitute-path /usr/src/debug <your debug capable fs path>/usr/src/debug
>

Yes! Yours is more reasonable. It is verified on my case:

4. On host side, Set a substitution rule for finding source files.
    Replace /usr/src/debug with ${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS}

(gdb) set substitute-path /usr/src/debug /TOPDIR/tmp/work/i586-poky-linux

//Hongxu

>> 5. On target side, ipaddr is 128.224.163.187,
>>     run gdbserver to debug "gzip -h"
>>
>> root@qemux86-64:~# gdbserver localhost:1024 gzip -h
>> Process gzip created; pid = 530
>> Listening on port 1024
>>
>> 6. On host side, enter gzip's devshell
>> $ bitbake -cdevshell gzip
>>
>> 7. On host side, run gdb-cross to remote debug gzip
>>
>> gzip-1.6# i586-poky-linux-gdb ../build/gzip
>>
>> 8. Use path ${STAGING_DIR_HOST} as the system root for
>>     the program being debugged. Any absolute shared
>>     library paths will be prefixed with path;
>>
>> (gdb) set sysroot /TOPDIR/tmp/sysroots/qemux86
>>
>>
>> 9. Start remote target, set break point at help()
>>
>> (gdb) target remote 128.224.163.187:1024
>> (gdb) break gzip.c:325
>> (gdb) info break
>> Num     Type           Disp Enb Address            What
>> 1       breakpoint     keep y   0x0000000000401ec1 in main at
>> /usr/src/debug/gzip/1.6-r0/gzip-1.6/gzip.c:325
>> (gdb) c
>> Continuing.
>>
>> Breakpoint 1, main (argc=2, argv=0x7fffffffeca8) at
>> /usr/src/debug/gzip/1.6-r0/gzip-1.6/gzip.c:465
>> 465                 help(); do_exit(OK); break;
>> (gdb) list
>> 460             case 'd':
>> 461                 decompress = 1; break;
>> 462             case 'f':
>> 463                 force++; break;
>> 464             case 'h': case 'H':
>> 465                 help(); do_exit(OK); break;
>> 466             case 'k':
>> 467                 keep = 1; break;
>> 468             case 'l':
>> 469                 list = decompress = to_stdout = 1; break;
>> (gdb) c
>> Continuing.
>> [Inferior 1 (process 1246) exited normally]
>>
>>
>> 10. On target side, get output of "gzip -h"
>> [snip]
>> Remote debugging from host 128.224.153.74
>> Usage: gzip [OPTION]... [FILE]...
>> Compress or uncompress FILEs (by default, compress FILES in-place).
>>
>> Mandatory arguments to long options are mandatory for short options too.
>>
>>    -c, --stdout      write on standard output, keep original files unchanged
>>    -d, --decompress  decompress
>>    -f, --force       force overwrite of output file and compress links
>>    -h, --help        give this help
>>    -k, --keep        keep (don't delete) input files
>>    -l, --list        list compressed file contents
>>    -L, --license     display software license
>>    -n, --no-name     do not save or restore the original name and time stamp
>>    -N, --name        save or restore the original name and time stamp
>>    -q, --quiet       suppress all warnings
>>    -r, --recursive   operate recursively on directories
>>    -S, --suffix=SUF  use suffix SUF on compressed files
>>    -t, --test        test compressed file integrity
>>    -v, --verbose     verbose mode
>>    -V, --version     display version number
>>    -1, --fast        compress faster
>>    -9, --best        compress better
>>
>> With no FILE, or when FILE is -, read standard input.
>>
>> Report bugs to <bug-gzip@gnu.org>.
>>
>> Child exited with status 0
>> GDBserver exiting
>> [snip]
>>
>> //Hongxu
>>