Re: hppa2.0w-hp-hpux11.11 bootstrap comparison failure gcc 11.3.0 and 10.4.0

[Jeff Law <jeffreyalaw@gmail.com>]

On 7/19/2022 9:25 AM, Dennis Grevenstein via Gcc-help wrote:
> Hi,
>
> I have tried to build either gcc 10.4.0 or 11.3.0 on hppa2.0w-hp-hpux11.11.
> Both produce the same error and fail at the comparison step:
>
> Comparing stages 2 and 3
> warning: hppa2.0w-hp-hpux11.11/libgcc/lib2funcs_s.o differs
> warning: hppa2.0w-hp-hpux11.11/libgcc/lib2funcs.o differs
> Bootstrap comparison failure!
> gcc/analyzer/diagnostic-manager.o differs
> gcc/analyzer/feasible-graph.o differs
> gcc/analyzer/program-point.o differs
> gcc/analyzer/engine.o differs
> gcc/analyzer/sm-signal.o differs
> gcc/analyzer/trimmed-graph.o differs
> gcc/calls.o differs
> gcc/cgraph.o differs
> gcc/ipa-comdats.o differs
> gcc/ipa-visibility.o differs
> gcc/ipa-inline-transform.o differs
> gcc/ipa-predicate.o differs
> gcc/ipa-ref.o differs
> make[2]: *** [Makefile:23872: compare] Error 1
> make[2]: Leaving directory '/usr/local/compile/gcc-11.3.0bin‘
>
>
> I am using gcc 9.5.0 to bootstrap:
[ ... ]
So the way we end up having to debug this stuff is to compare the 
resulting code in the files that differ and where/why they differ. Given 
that the PA/HP-UX isn't a common target anymore, it's entirely possible 
something has gone wonky.  I know John David Anglin does build it 
semi-regularly, maybe he has some insight.  My tester only builds 32bit 
PA Linux, so it's not particularly helpful.

It might be something in the debug sections, in which case bootstrapping 
without -g should get you over the hump.  It might also be a problem 
where -g is impacting the resulting code generation (that's not supposed 
to happen, but does), and again bootstrapping without -g should get you 
over the hump.

It may also be the case that there's a codegen issue in gcc-9.5.0 that 
affects building gcc-10 and gcc-11.  I think it's pretty unlikely to be 
a binutils problem.


So the first step is to look at those files and see where they differ.  
Do they differ in the contents of the text section or is it something else?

jeff