Re: C Preprocessor Macro expansion in GDB
Re: C Preprocessor Macro expansion in GDB
- Subject: Re: C Preprocessor Macro expansion in GDB
- From: Jim Ingham <email@hidden>
- Date: Thu, 19 Jan 2006 17:05:04 -0800
Doh! Chris pointed out you had gotten to -gdwarf-2 and -g3...
DWARF itself works somewhat on Mac OS X but mostly because we haven't
done anything explicitly to make it NOT work. But we don't support
it/test it/etc. yet. For the same reason we don't have a mach-o
DWARF dumper.
All this is in our plans, but is not there for Xcode 2.2.
Jim
On Jan 19, 2006, at 3:43 PM, Jim Ingham wrote:
The stabs debugging format doesn't support recording macro
information. So with the current tools, you can't get the compiler
to emit macro information.
Jim
On Jan 19, 2006, at 3:26 PM, James Widman wrote:
Hi all,
I'm interested in using preprocessor macros in expressions in GDB
sessions, but I can't seem to get it to work. I followed the
example given here:
http://developer.apple.com/documentation/DeveloperTools/gdb/gdb/
gdb_10.html
As specified in the documentation, I compiled like so (using GCC
4.0.1, bundled with Xcode 2.2.1):
gcc -gdwarf-2 -g3 sample.c -o sample
But when I got to the point in the example where it instructs you
to issue the GDB command:
info macro ADD
... I received only this message:
GDB has no preprocessor macro information for that code.
Now, I haven't yet found the Mach-O equivalent of:
readelf --debug-dump=macro sample
... but when I load the binary file 'sample' into a text editor, I
can see a region where all of the macro definitions are stored.
So it kind of looks like GCC did its part to generate debug
symbols for macros, but GDB decided not to load them in.
Is macro expansion supported in Apple's version of GDB? If so,
how can I coax it into performing its documented behavior?
Thanks in advance,
James
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