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Hi I've been experimenting some with removing debug information from binaries and placing it in a separate file, and then having gdb automatically load these if availible. (The goal here is to package debug information in separate packages that can be on-demand downloaded and installed.) I have written a libelf based application that takes an elf file, splits out debug information to a separate file, strips the original file and adds a ".debuglink" section to the stripped file. This section contains the basename of the filename of the debug file and a crc32 checksum of it. I've also written an "unstrip" application that puts together the original ELF file from the stripped one and the debug file (and some extra information I put in a section of the debug file). This produces a bitwise identical file to the original. My next step is to make gdb automatically follow ".debuglink" sections so that i don't have to use the unstrip application. Attached to this mail is a patch that implements a "badhack" which seems to almost work. In order for it to work I had to add all the original section headers to the debug file (but SHT_NOBITS, so they take no space). It seems to work for the main binary, but setting breakpoints in libraries doesn't work. I think it gets the base address wrong or something. What are your opinions about this solution? Has anything like this been done or tought of before? I'm pretty scared of the gdb codebase (looked at it for the first time today), so my solution is probably both buggy and generally wrong, tips of other ways to do this are appreciated. -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Alexander Larsson Red Hat, Inc alexl@redhat.com alla@lysator.liu.se He's a benighted Jewish romance novelist plagued by the memory of his family's brutal murder. She's a time-travelling Bolivian traffic cop with only herself to blame. They fight crime!
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gdb-5.2.1-separate-debug.patch
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