gcc question

[Alexandre Oliva]

On Feb  2, 2000, Sang-Kil Lee <sklee@synopsys.COM> wrote:

> I ran it and it finished successfully but didn't invoke a debugger(ex.
> gdb).

It's not supposed to.  `-g' just tells the compiler to add debugging
information to the program.

> Of course, I know that I can invoke the binary code using gdb(ex.
> unix_prompt> gdb <binary_code>).

That's what you'll have to do.

> But what I want is that the debugger is invoked as soon as I run the
> binary code.
> Is it possible to attach the debugger to the binary code?

Well, it *is* possible to do, but you don't really want to do that.
You'd have to fork() the process right in the beginning of main(),
execlp("gdb", argv[0], pid_of_other_process, NULL) in one of the
processes and kill(getpid(), SIGSTOP) in the other, so that it waits
for gdb to attach to it.  pid_of_other_process is the result of
converting the pid of the other process to a string.

-- 
Alexandre Oliva http://www.ic.unicamp.br/~oliva IC-Unicamp, Bra[sz]il
oliva@{lsd.ic.unicamp.br,guarana.{org,com}} aoliva@{acm,computer}.org
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