gcc -rdynamic

-rdynamic passes the flag export-dynamic to the ELF linker (if the target supports it) which instructs the linker to add all rather than only the used ones symbols to the dynamic symbol table.

Obtaining a backtrace from a program

The following program should be compiled with -rdynamic:

//
//  https://github.com/soarpenguin/code-sample-c/blob/master/backtrace.c
//
#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>

void backtr() {
    void *callstack[128];

    int    nofsymbols = backtrace(callstack, 128);
    char **symbols    = backtrace_symbols(callstack, nofsymbols);

    for (int i = 0; i < nofsymbols; ++i) {
        printf("%s\n", symbols[i]);
    }

    free(symbols);
}


       void func_D() { backtr(); }
       void func_C() { func_D(); }
static void func_B() { func_C(); } //The name of func_B is not exposed because it is static.
       void func_A() { func_B(); }

       int  main()   { func_A(); }

Github repository about-gcc, path: /options/r/dynamic/prog.c

The program prints something like

./prog(backtr+0x1f) [0x563568ad6188]
./prog(func_D+0xe) [0x563568ad61f4]
./prog(func_C+0xe) [0x563568ad6205]
./prog(+0x1216) [0x563568ad6216]
./prog(func_A+0xe) [0x563568ad6227]
./prog(main+0xe) [0x563568ad6238]
/lib/x86_64-linux-gnu/libc.so.6(+0x2724a) [0x7f690547024a]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7f6905470305]
./prog(_start+0x21) [0x563568ad60a1]

gcc -rdynamic

Obtaining a backtrace from a program

See also