In GDB, how can I set 'exec-wrapper env' to multiple environmental variables?

Question

In GDB you can set the environmental variables for a process using set exec-wrapper env 'MYENVVAR=...'. This works great, but I'm not sure how to set multiple ones - is there some sort of delimiter you have to use? I'd like to set both LD_PRELOAD and LD_LIBRARY_PATH for a process. How would I do this?

Answer 1

You can use

set exec-wrapper env VAR1=val1 VAR2=val2

to set multiple environment variables. The values should be appropriately quoted for your shell, so putting single quotes around them would be a good idea.

In slightly more detail:

The set exec-wrapper command sets a string variable to contain the rest of the command line.

When it comes time to run your executable, gdb does something like the following pseudo-code:

shell_cmd = "exec ";
if (exec_wrapper)
     shell_cmd += exec_wrapper + " ";
shell_cmd += quote_shell_metacharacters(exec_file);
execl(getenv("SHELL"), "sh", "-c", shell_cmd, (char *)0);

So, exec-wrapper can be any command line that makes sense when preceded by "exec " in your shell.