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C Preprocessor Macro expansion in GDB

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C Preprocessor Macro expansion in GDB

Subject: C Preprocessor Macro expansion in GDB
From: James Widman <email@hidden>
Date: Thu, 19 Jan 2006 18:26:51 -0500

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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