Re: Debugging with gdb

[Russell Shaw <rjshaw at netspace dot net dot au>]

Ian Lance Taylor wrote:
> Russell Shaw <rjshaw@netspace.net.au> writes:
>
> > Where do i set gdb in the gcc code so that i can step thru the generation
> > of rtl output in a high-level kind of way?
>
> RTL is generated in a high-level way in all kinds of places.  I don't
> think there is any particularly good breakpoint to set.  For a
> particular insn, you can sometimes break on gen_INSN, in this case
> gen_movhi(), which is a generated function appearing in the generated
> file insn-emit.c.
>
> > Gdb can't find the function output_movhi in gcc/config/avr/avr.c. Do i need
> > to dynamically load something?
>
> No, there is no dynamic loading involved.  I don't know why gdb can't
> find it.
>
> Ian

V.H reminded me gcc is just a driver, which is why i couldn't see any
of the functions with nm (should have done nm /usr/local/libexec/gcc/avr/3.4.3/cc1).

Now just need to find where cc1 is called from within in gcc/gcc.c (not really trivial).