On 2/10/16 9:41 PM, Gary Thomas wrote: > On 2016-02-10 21:08, Khem Raj wrote: >> >>> On Feb 10, 2016, at 8:35 AM, Mark Hatle <mark.ha...@windriver.com> wrote: >>> >>> On 2/10/16 1:31 AM, Gary Thomas wrote: >>>> I'm trying to debug some code (mplayer) which uses some shared >>>> libraries from ffmpeg. When I use GDB (via gdbserver), I don't >>>> get all the debug information I need - note that many of the shared >>>> libraries do not have any symbolic debugging info: >>> >>> Is your system using the the split debug binaries, and if so, do you have >>> them >>> all installed on the system that GDB is running on? >>> >>> (When GDB starts, you should see it load the symbols, or error it can't >>> find them.) >>> >>> Assuming you DO have the symbol files available, and some things are lacking >>> debuginfo, it's possible those recipes are not properly building with full >>> symbols (they should be, the whole system should be.) >>> >>> Easiest way to check is do a readelf/objdump on the .debug version of the >>> library and check that there are dwarf symbols present... if not, it's >>> probably >>> a recipe error. >>> >>> --Mark >>> >>>> (gdb) info sharedlibrary >>>> From To Syms Read Shared Object Library >>>> 0xb6fcf800 0xb6feaf08 Yes /tmp/p0382.img/lib/ld-linux-armhf.so.3 >>>> 0xb6fa6fa8 0xb6fb2b40 Yes (*) /tmp/p0382.img/lib/libtinfo.so.5 >>>> 0xb6f6d210 0xb6f8c200 Yes /tmp/p0382.img/usr/lib/libpng16.so.16 >>>> 0xb6f488e8 0xb6f54a60 Yes /tmp/p0382.img/lib/libz.so.1 >>>> 0xb6f069f0 0xb6f34264 Yes /tmp/p0382.img/usr/lib/libjpeg.so.8 >>>> 0xb6edbaf0 0xb6eee29c Yes /tmp/p0382.img/usr/lib/libdvdread.so.4 >>>> 0xb6eb6108 0xb6ec7ae8 Yes /tmp/p0382.img/usr/lib/libass.so.4 >>>> 0xb6e808b8 0xb6e95384 Yes /tmp/p0382.img/usr/lib/libvorbis.so.0 >>>> 0xb6e6b4b4 0xb6e6d7e4 Yes /tmp/p0382.img/usr/lib/libogg.so.0 >>>> 0xb6e48978 0xb6e55eb4 Yes /tmp/p0382.img/usr/lib/libspeex.so.1 >>>> 0xb6dfe818 0xb6e1b8b4 Yes (*) /tmp/p0382.img/usr/lib/libfaad.so.2 >>>> 0xb6d92df0 0xb6dd4e78 Yes (*) /tmp/p0382.img/usr/lib/libavutil.so.54 >>>> 0xb5de0640 0xb64a2e18 Yes (*) /tmp/p0382.img/usr/lib/libavcodec.so.56 >>>> 0xb5c17528 0xb5d65840 Yes (*) >>>> /tmp/p0382.img/usr/lib/libavformat.so.56 >>>> 0xb5b81688 0xb5be8db8 Yes (*) /tmp/p0382.img/usr/lib/libswscale.so.3 >>>> 0xb5b5f578 0xb5b6c718 Yes (*) >>>> /tmp/p0382.img/usr/lib/libswresample.so.1 >>>> 0xb5b44998 0xb5b4b490 Yes (*) >>>> /tmp/p0382.img/usr/lib/libpostproc.so.53 >>>> 0xb5b1f0e0 0xb5b2e194 Yes /tmp/p0382.img/lib/libpthread.so.0 >>>> 0xb5aa4c00 0xb5ad46d0 Yes /tmp/p0382.img/lib/libm.so.6 >>>> 0xb5a859ec 0xb5a8fc34 Yes /tmp/p0382.img/usr/lib/libXext.so.6 >>>> 0xb597b728 0xb59f92bc Yes /tmp/p0382.img/usr/lib/libX11.so.6 >>>> 0xb5946fc8 0xb59573d0 Yes >>>> /tmp/p0382.img/usr/lib/libtheoradec.so.1 >>>> 0xb5887910 0xb591bbb8 Yes (*) /tmp/p0382.img/usr/lib/libasound.so.2 >>>> 0xb58579f8 0xb58586ac Yes /tmp/p0382.img/usr/lib/libXss.so.1 >>>> 0xb5844ca0 0xb5846bac Yes /tmp/p0382.img/usr/lib/libXv.so.1 >>>> 0xb57e7700 0xb58265e0 Yes /tmp/p0382.img/usr/lib/libSDL-1.2.so.0 >>>> 0xb56bae00 0xb57abb28 Yes /tmp/p0382.img/lib/libc.so.6 >>>> 0xb569292c 0xb5693724 Yes /tmp/p0382.img/lib/libdl.so.2 >>>> 0xb5650a70 0xb566e6a4 Yes >>>> /tmp/p0382.img/usr/lib/libfontconfig.so.1 >>>> 0xb561e324 0xb563951c Yes /tmp/p0382.img/usr/lib/libexpat.so.1 >>>> 0xb559d36c 0xb55f5cb4 Yes /tmp/p0382.img/usr/lib/libfreetype.so.6 >>>> 0xb55622b0 0xb5567e84 Yes /tmp/p0382.img/usr/lib/libenca.so.0 >>>> 0xb541fbc0 0xb54b5a08 Yes (*) /tmp/p0382.img/usr/lib/libx264.so.144 >>>> 0xb53d4df0 0xb53fa0b0 Yes >>>> /tmp/p0382.img/usr/lib/libtheoraenc.so.1 >>>> 0xb53a72b0 0xb53bd258 Yes (*) /tmp/p0382.img/usr/lib/liblzma.so.5 >>>> 0xb5386050 0xb5392cc0 Yes (*) /tmp/p0382.img/usr/lib/libbz2.so.0 >>>> 0xb5367810 0xb5373b30 Yes /tmp/p0382.img/usr/lib/libxcb.so.1 >>>> 0xb534da00 0xb534e5a8 Yes /tmp/p0382.img/usr/lib/libXau.so.6 >>>> 0xb5339f80 0xb533b69c Yes /tmp/p0382.img/usr/lib/libXdmcp.so.6 >>>> 0xb5323720 0xb5326ea0 Yes /tmp/p0382.img/lib/librt.so.1 >>>> 0xb530b6e0 0xb5311234 Yes /tmp/p0382.img/usr/lib/libXrandr.so.2 >>>> 0xb52f3530 0xb52f9060 Yes /tmp/p0382.img/usr/lib/libXrender.so.1 >>>> 0xb52d3160 0xb52e18a4 Yes /tmp/p0382.img/lib/libgcc_s.so.1 >>>> (*): Shared library is missing debugging information. >>>> >>>> Is this a function of how those libraries were built (by the recipe) >>>> or something else? How can I get the symbolic debugging info enabled? >>>> >>>> Thanks for any pointers >> >> >> Usually it works well if you add >> >> EXTRA_IMAGE_FEATURES_append = “ dbg-pkgs” >> >> image size grows but you get good debug view on target. >> >> another option, I usually use is setup feeds >> and then >> >> opkg install <package>-dbg >> >> which pulls in a section of debug info needed to debug a given package. >> > > I've done all this already. The problem is that for the libraries which > have no symbols there are no corresponding -dbg packages :-( I looked > at the ffmpeg recipe (where the libswresample library I'm most interested > in comes from) and there is serious magic involved in the packaging. I'm > pretty sure that's where the discrepancy lies... Any help understanding > how to fix that would be appreciated.
If the package is being built from source, I'd expect -dbg to be generated.. if it's not, we definitely should investigate. The intention has always been to generate -dbg for the core pieces.. External layers can disable it if they're packaging binaries or commercial, but that is different. --Mark > -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
