How to use gdb with LD_PRELOAD

Question

I run a program with LD_PRELOADing a specific library. Like this.

LD_PRELOAD=./my.so ./my_program

How do I run this program with gdb<

Answer 1

You can basically do it the same way, just add gdb before the program name:

LD_PRELOAD=./my.so gdb ./my.program

You can check the environment variables using:

(gdb) show environment LD_PRELOAD

In the rare case you actually need to change it inside gdb, e.g. when debugging a dlopen(), you ca do that:

(gdb) set environment LD_PRELOAD ./my.so

Oh, wait, it doesn't work for me with gdb 7.6.2! The library doesn't get loaded, that means none of the answer here are entirely correct, at least with current tools.