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DEBUG file needs updating


From: Nick Roberts
Subject: DEBUG file needs updating
Date: Mon, 13 Dec 2004 01:24:35 +1300

The DEBUG file says:

DEBUG>   XVECTOR (this_command_keys)->contents[this_command_key_count++] = key;

DEBUG> XVECTOR is a macro, and therefore GDB does not know about it.
DEBUG> GDB cannot evaluate "p XVECTOR (this_command_keys)".

This is no longer true as of GDB 5.3 and GCC 3.1 (both probably about two
years old). The NEWS entry for GDB says:

GDB> * GDB now supports C/C++ preprocessor macros.

GDB> GDB now expands preprocessor macro invocations in C/C++ expressions,
GDB> and provides various commands for showing macro definitions and how
GDB> they expand.

This is invaluable to someone who is just starting to look at the C code
and makes many of the functions defined in .gdbinit irrelevant (assuming
the appropriate GDB and GCC are available). It just requires that the code
is compiled with "-g3".

One smaller point, the example sets a breakpoint at line 1296 of xmenu.c
which clearly has changed now. If it sets a breakpoint on a procedure name
rather than a line number it might be correct for longer.

Nick




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