Re: Build failure with probe patch

[Sergio Durigan Junior <sergiodj at redhat dot com>]

On Wednesday, February 18 2015, Steve Ellcey wrote:

> I would like to avoid updating GCC if possible.  I build on old systems
> because some of our customers use old systems.  I don't know if gdb has
> a 'minimal GCC' that it can be compiled with like GCC and some other
> projects have.

Sure, it's your option.  I know some people here still use old compilers
to build GDB, but I don't remember of any explicit rule about a minimal
GCC version.

>  I tried changing the definition of 'dof' to be '
> bfd_byte *' instead of 'struct dtrace_dof_hdr *' and then casting it on
> the call to dtrace_process_dof instead of the call to
> bfd_malloc_and_get_section.  That got rid of the type punning message
> but I wound up seeing:
>
> /scratch/gcc/nightly/src/binutils-gdb/gdb/dtrace-probe.c: In function
> 'dtrace_get_probes':
> /scratch/gcc/nightly/src/binutils-gdb/gdb/dtrace-probe.c:64: warning:
> 'arg.expr' is used uninitialized in this function
> make[1]: *** [dtrace-probe.o] Error 1

This error message is completely misleading.  I built GCC 4.1.2 and
managed to reproduce it, but I couldn't find the reason.  Anyway, I have
not spent too much time on the problem, but let me know if you need some
help.

> Which I do not understand at all.  I will investigate some more and see
> if there is a clean way to get this to compile with GCC 4.1.2.

That would be much appreciated.  Thank you!

-- 
Sergio
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