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 15:43:35 -0800
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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