Gdb Won't Load Source File

GDB won't load source file

Read carefully the documentation of GDB notably about source path. You want to use the dir command

Also, switch to a newer gdb (perhaps by compiling gdb from its source code). Current version is 7.7 (so 6.8 is really old)

gdb doesn't show the source file

I don't understand why instead of the source file name it shows <command-line>.

As Jonathan Wakely correctly stated, this is because the input to gcc came from pipe. Something like:

sed -e 's/foo/bar/' foo.c | gcc -g -o bar.o -xc -

is there a way to tell gdb where to find which function?

You already know which function this is: omx_isend. Presumably you want to tell gdb that this function came from some file, e.g. foo.c.

I don't believe there is a way to do that in GDB. Your best bet is to adjust your Makefile. Instead of the sed above, do this:

sed -e 's/foo/bar/' foo.c > foo-subst.c && gcc -g -o bar.o foo-subst.c

Then GDB will just work (TM).

GDB stepping into shared library shows no such file even though debug symbols are loaded

You need to also tell gdb where the source files are. Which means you also need the source files, not just the debugging symbols.

It's important that the sources you download are the actual ones used to compile the library, because debugging information only contains filename and line number. If you give gdb a file where the line numbers don't correspond (a different version, for example), the source lines printed by gdb will be very confusing. It has no way to know they are wrong. You should be able to use the src deb with the same version number as the library debs.

Once you have the source files, tell gdb where to look for them with

directory /path/to/source/files

You can specify several paths. Read help directory inside gdb.

Since you'll need to do this often, put that line into a gdbinit file. You'll probably want to use .gdbinit in your current directory, but .gdbinit in your home directory might also be a possibility. Gdb uses both.

If you're working with a library whose source is spread over a subdirectory tree, you might find it useful to set a substitution path:

set substitute-path /your/file/path /original/file/path

Again, more help is available with help set substitute-path.

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