Sometimes installing the debug packages for gtk and glib isn‘t quite enough. (For instance, if the artifacts from -O2 are driving you bonkers in gdb, you might want to rebuild with -O0.) Here’s how to build from source and use your local version without installing it.
On Ubuntu, to download and build glib and gtk suitable for debugging:
If you don't have a gpg key yet, generate one with gpg --gen-key.
Create file ~/.devscripts containing DEBSIGN_KEYID=yourkey, e.g. DEBSIGN_KEYID=CC91A262 (See http://www.debian.org/doc/maint-guide/ch-build.en.html)
If you're on a 32 bit system, do:
#!/bin/sh set -x set -e # Workaround for "E: Build-dependencies for glib2.0 could not be satisfied" # See also https://bugs.launchpad.net/ubuntu/+source/apt/+bug/245068 sudo apt-get install libgamin-dev sudo apt-get build-dep glib2.0 gtk+2.0 rm -rf ~/mylibs mkdir ~/mylibs cd ~/mylibs apt-get source glib2.0 gtk+2.0 cd glib2.0* DEB_BUILD_OPTIONS="nostrip noopt debug" debuild cd ../gtk+2.0* DEB_BUILD_OPTIONS="nostrip noopt debug" debuild
This should take about an hour. If it gets stuck waiting for a zombie, you may have to kill its closest parent (the makefile uses subshells, and bash seems to get confused). When I did this, it continued successfully.
At the very end, it will prompt you for the passphrase for your gpg key.
Then, to run an app with those libraries, do e.g.
export LD_LIBRARY_PATH=$HOME/mylibs/gtk+2.0-2.16.1/debian/install/shared/usr/lib:$HOME/mylibs/gtk+2.0-2.20.1/debian/install/shared/usr/lib
gdb ignores that variable, so in the debugger, you would have to do something like
set solib-search-path $HOME/mylibs/gtk+2.0-2.16.1/debian/install/shared/usr/lib:$HOME/mylibs/gtk+2.0-2.20.1/debian/install/shared/usr/lib
See also http://sources.redhat.com/gdb/current/onlinedocs/gdb_17.html
If you're on a 64 bit system, you can do the above on a 32 bit system, and copy the result. Or try one of the following:
apt-get source glib-2.0 gtk+-2.0 export CFLAGS='-m32 -g' export LDFLAGS=-L/usr/lib32 export LD_LIBRARY_PATH=/work/32/lib export PKG_CONFIG_PATH=/work/32/lib/pkgconfig # glib setarch i386 ./configure --prefix=/work/32 --enable-debug=yes # gtk setarch i386 ./configure --prefix=/work/32 --enable-debug=yes --without-libtiff
Note: Evan tried this and didn't get any debug libs at the end.
Or you could try this instead:
#!/bin/sh set -x set -e sudo apt-get build-dep ia32-libs rm -rf ~/mylibs mkdir ~/mylibs cd ~/mylibs apt-get source ia32-libs cd ia32-libs* DEB_BUILD_OPTIONS="nostrip noopt debug" debuild
By default, this just grabs and unpacks prebuilt libraries; see ia32-libs-2.7ubuntu6/fetch-and-build which documents a BUILD variable which would force actual building. This would take way longer, since it builds dozens of libraries. I haven't tried it yet.
debuild may fail with
gpg: [stdin]: clearsign failed: secret key not available debsign: gpg error occurred! Aborting....
if you forget to create ~/.devscripts with the right contents.
The build may fail with a FAIL: abicheck.sh if gold is your system linker. Use ld instead.