Visual c++ for Linux Development debugging shared library - linux

Question

I would like to debug shared library in Visual C++ Linux Development. Debugging executable file works well, but the breakpoint does not hit for shared library. How can I fix up?
Attached file is visual studio solution including .c and Makefile.
Example is very simple.
open shared library
read pointer of function in shared library
call the function.
Program works well. But Debugging shared library does not works. The breakpoint in main.c hits but the breakpoint in com.c does NOT hit.
/* main.c */
#include <stdio.h>
#include <dlfcn.h>
int main(int argc, char** argv)
{
void* dl_handle;
dl_handle = dlopen("../so/libcom.so.1", RTLD_LAZY);
if (!dl_handle) {
printf(" error : %s \n", dlerror());
return 0;
}
printf(" now call minicommon.h's function.. that is < void print_n(int n) >...\n");
void(*pFunc)(int);
pFunc = dlsym(dl_handle, "print_n");
(*pFunc)(18);
return 0;
}
/* com.c */
#include <stdio.h>
void print_n(int a)
{
printf("SO - print: [%d]\n", a);
}
/* Makefile for main.c */
all: main
main: main.o
gcc -W -Wall -gdwarf-2 -o main ../so/libcom.so.1 main.o -ldl
main.o: main.c
gcc -Wall -c -gdwarf-2 -o main.o main.c
clean:
rm -rf *.o main
/* Makefile for com.c */
all: libcom.so.1
libcom.so.1: com.o
gcc -shared -gdwarf-2 -o libcom.so.1 com.o
com.o: com.c
gcc -Wall -c -gdwarf-2 -o com.o com.c -fPIC
clean:
rm -rf *.o libcom.so.1
Before shared library is opened, can I debug it?
Environment
- Window 10
- CentOS 7 in VirtualBox
- Visual Studio 2015 update 3
- Visual C++ for linux Development 1.0.7

Answer 1

To be able to debug any binary (which includes shared libraries) you need the debugging symbols being available, either compiled into the binary itself, or as a separate file.
In most Linux distributions you can install the debugging symbols as separate package; Ubuntu for instance names these packages <packagename>-dbg. Check if these are available in your development environment, too.