how to specify the path to source code of shared labrary ?

[daif-abde]

Hi,

is there a way to specify the path to the source code of a library (.so) file ?

I would like to put breakpoints in my library, and see how it runs, the source code is in a different directory than the executable with which I run gdb.

If it's possible would you please show an example.

Thank you!

[GitMensch]

... have you checked how this works in GDB? Using my favorite search machine the third entry is https://sourceware.org/gdb/onlinedocs/gdb/Source-Path.html which explains "it doesn't matter as long as you have the cwd within gdb set identical to the cwd during compile time or compile with full paths" and also mentions the directory and subtitute-path settings.

For this extension it would be the settings cwd, pathSubstitutions and autorun [in the later you may specify gdb commands directly, in this case directory].

... and of course the shared library has the have been compiled and linked with debug info (-g), otherwise disassemble is the only option.

[daif-abde]

Thank you !!
Yes I have compiled using -g.
This is my current configuration :

~/test/test.c mylib.so test
~/dev/mylib/mylib.c ...

and I run gdb with test.o that calls mylib.so
so in lauch.json I have the following config:

target: "./test"
cwd: "${workspaceRoot}"

with just gdb I can make a break point in mylib.c with : b funtion_name
but how to specify in my lauch.json the code source path (i.e ~/dev/lib/mylib.c) ? is there any option to do this ?

thank you!

[GitMensch]

You give the "main source code path" via cwd (as you did not specify where this is I don't know - but you can also specify "cwd":"~/dev/mylib" ).

For specifying multiple directories:

				"autorun": [
						"directory ~/dev/mylib",
						"directory ~/test"
				],

[daif-abde]

Thank you !! it works :)

[GitMensch]

@WebFreak001 @brownts: Do you think an array setting additionalSourceDirectories would be useful? If not should we add a hint on autorun->directory to the README or see it as "common GDB setting"?
Depending on your answer we should either close the ticket directly or after the appropriate changes.

[brownts]

Is this a case where full source paths are not being used during the compilation of the shared library? I would think this should work as-is without needing additional paths specified unless full paths are not being used. Additionally, it might be necessary to allow pending breakpoints so that the breakpoint is set in the shared library once it is loaded. I'm not sure I fully understand the cause of this issue.