QNX gdb server to debug a application - gdb

Question

Nowdays I use qnx gdb server to debug a application, but there are some amazing things happend.
There are lots of files in my project, for examples
src/a.c src/b.c src/c.c
include/a.h include/b.h include/c.h
using Makefile, I generate a libso file named libtest.so and a executable file name helloworld.
I scp the libtest.so and helloworld to target machine, and the path is /home/user/myapp/ and set PATH well, and I can run helloworld in target machine
Attention there is a fun name Display() fun in the libtest.so, and there is a fuction named myfun() in the include/c.h(at line 5), and myfun will call Dislpay() function:
myfun(){Display();}
When I use qnx gdb server , the step is as follows:
1. ntoaarch64-gdb
2. file helloworld
3. target qnx IP:PORT
4. upload helloworld /home/user/helloworld
5. b c.h:5
6. r
It call stop at breakpoint myfun(), but when I run step or stepi command,
it can not step into Display() function, and I run disassemblecommand,
it show 0x100cd5e0 <Display#plt>, There is no disassembly content about Display function, I seemed be omitted!
There are any worng or missing step when I debug this application, who can help my, I have speed five days... Thank a lot
By the way, I think is a gdb server question instead of a qnx gdb server question.

Answer 1

but when I run step or stepi command, it can not step into Display() function
This is somewhat expected with lazy dynamic symbol resolution. Note that if you call myfun again, you should be able to step into Display without problems.
The best solution is to set a break Display.
Alternatively, you could use export LD_BIND_NOW=1 before running helloworld, or link the binary with -Wl,-z,now to disable lazy symbol binding.