Nested control structures in Apple GDB broken?

[Ryan Govostes]

I've been having an issue with the version of GDB that comes with the Apple Developer Tools, and I wanted to see if it is due to Apple's changes to the code, or GDB itself. Here is the start up message when I run GDB:

> GNU gdb 5.3-20030128 (Apple version gdb-330.1) (Fri Jul 16 21:42:28 GMT 2004)
> Copyright 2003 Free Software Foundation, Inc.
> ...

The problem I've been having is that I cannot use nested control structures. For instance, this will work just fine:

> if($r3 == 0)
> printf "$r3 is 0.\n"
> else
> printf "$r3 is not 0.\n"
> end

However, if I try this:

> if($r3 == 0)
> printf "$r3 is 0.\n"
> else
> if($r3 > 0)
> printf "$r3 is greater than 0.\n"
> else
> printf "$r3 is less than 0.\n"
> end
> end

I get the message "Junk after end of expression." I believe this was working in earlier versions, because I have some defined commands in my .gdbinit file which have loops and such, but none of them work anymore. For instance, when I run this command:

> # Searches for the start of the current function
> define fs
> set $i = $pc
> while(*$i != 0x7C0802A6)
> set $i = $i - 4
> end
> print $i
> end

I get another "Junk after end of expression." error, though I'm certain that at the time I wrote it, the command worked fine.

I haven't tested to see if this is fixed in the developer tools which will come with Mac OS 10.4 "Tiger", but I will try to find someone who has a recent copy to see if the problem is fixed.

Regards,
Ryan Govostes