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gdb: breakpoints with dynamic library #74

qqldd opened this issue Apr 18, 2019 · 3 comments


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commented Apr 18, 2019

With dynamic library saying, I have: -> -> main [which use the]

If I dap-add-breakpoint on on gdb main, the gdb will prompt:

No source file named
Make breakpoint pending on future shared library load? (y or [n]) 

But dap will ignore with no breakpoint set. So I cannot step into program. Is there any template argument I can configure with?

Usually when I do gdb, I will enter start command to start the program so that the .so file is loaded. I can break on
Or we can answer yes to: "Make breakpoint pending on future shared library load? (y or [n]) "


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commented Apr 19, 2019

@qqldd I do not have gdb/lldb expertize, so in order to work on this issue I will need detailed steps to reproduce(e. g. how to build shared lib, etc). As far as I can see from Native Debug readme there are some limitations related to setting breakpoints when using gdb(e. g. you should stop the thread and then set the breakpoint) which is a pretty severe limitation and might be related to the problem. The full list of configuration settings could be found here - and I don't see a setting related to your problem.

PS: We might try to integrate with the gdb dap adapter implemented by MS which I suspect which be more functional(


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commented Apr 20, 2019

Hmm after I write below down, I cannot reproduce this issue using following example even with same output as I describe above. The breakpoints actually useful. I will still keep following for now:

I will modify the command from here to provide instructions on how to create dynamic library:

  1. Write foo.c and main.c with following content:
#include <stdio.h>
void foo(void) {
  puts("Hello, I'm a shared library");


#include <stdio.h>
extern void foo(void);
int main(void) {
  puts("This is a shared library test...");
  return 0;

Put foo.c and main.c in same folder and execute following comment in shell:

gcc -c -g -Wall -Werror -fpic foo.c
gcc -g -shared -o foo.o
gcc -L./ -g -Wall -Wl,-rpath $PWD -o test main.c -lfoo

It will output test executable and is a dynamic library. test will load this library when running.

After that, if I do:
gdb ./test
inside gdb, I type:
(gdb) b foo.c:3 No source file named foo.c. Make breakpoint pending on future shared library load? (y or [n])

But this is not the case after program is running since is loaded:

(gdb) start
Temporary breakpoint 1 at 0x77e: file main.c, line 4.
Starting program: /home/myrice/Work/test 

Temporary breakpoint 1, main () at main.c:4
4         puts("This is a shared library test...");
(gdb) b foo.c:3
Breakpoint 2 at 0x7ffff7bd760e: file foo.c, line 3.

In Eamcs, if I setup a breakpoint at foo.c:3, it will outputs

Unable to determine compiler version.
Skipping loading of libstdc++ pretty-printers for now.
No source file named /home/myrice/Work/foo.c.
Running executable

Breakpoint 1, foo () at foo.c:3
3	  puts("Hello, I'm a shared library");

Yes, it stops. Lol...

I need to see why the complicate one not is not stopping.


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commented Apr 20, 2019

@qqldd did you try to stop the thread after your library is loaded and then place the breakpoint?

Anyway, I think that cpptools gdb adapter will solve your issues.

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