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#1 2015-05-10 08:58:29
- drt123
- Member
- Registered: 2015-01-06
- Posts: 5
gdb and libc debug symbols
hi, im trying to make gdb use debugging symbols for libc, but to no avail. I am running a standard 64-bit arch install, fully updated.
gdb is 7.9, gcc is 4.9.2, glibc is 2.21
file shows
/usr/lib/libc-2.21.so: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /usr/lib/ld-linux-x86-64.so.2, BuildID[sha1]=879c9c4ffc5aabfd0a9c9d1b1c73d5f1df969aac, for GNU/Linux 2.6.32, not stripped readelf --syms reads a million lines of symbols, however readelf --debug-dump=info on libc gives no output (nor any errors).
gdb says
Reading symbols from /usr/lib/libc.so.6...(no debugging symbols found)...done.on verbose after run, and
574d0 0x00007ffff7b83ee4 Yes (*) /usr/lib/libc.so.6
(*): Shared library is missing debugging information.on info shared.
i have built glibc from the abs with the debug option added, that built 2 packages, glibc and glibc-debug. i have installed the debug one with pacman, the files went into /usr/lib/debug/usr/lib.
i have set debug-file-directory to /usr/lib/debug/usr/lib, that didnt help either. i have manually tried to load the symbols from the debug file with symbol-file, no dice.
help would be much appreciated, doing this on debian systems is a piece of cake (just install the debug package for the library et voila), i must be doing something wrong. thank you
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#2 2015-05-10 10:30:16
- Trilby
- Inspector Parrot
- Registered: 2011-11-29
- Posts: 29,550
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Re: gdb and libc debug symbols
Did you rebuild glibc with debugging symbols (i.e. the "-g" flag for gcc)? Not stripping normal symbols is different that including debuggin symbols.
Last edited by Trilby (2015-05-10 10:30:41)
"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" - Richard Stallman
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#3 2015-05-10 11:25:40
- drt123
- Member
- Registered: 2015-01-06
- Posts: 5
Re: gdb and libc debug symbols
options=('debug' 'staticlibs')these are the options i have set in the PKGBUILD, i might try giving CFLAGS directly, but compiling libc on this old dualcore takes quite a bit of time unfortunately
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#4 2015-05-10 13:02:43
- Allan
- Pacman
- From: Brisbane, AU
- Registered: 2007-06-09
- Posts: 11,400
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Re: gdb and libc debug symbols
Read the glibc PKGBUILD - particularly at the end of the package() function.
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