------- Comment #3 from ebotcazou at gcc dot gnu dot org 2010-09-21 21:45
-------
> Java is severely broken on sparc64-linux with gcc 4.5/4.6, which is a major
> regression from 4.4:
>
> http://gcc.gnu.org/ml/gcc-testresults/2010-05/msg00853.html (4.6 broken)
> http://gcc.gnu.org/ml/gcc-testresults/2010-05/msg00681.html (4.5 broken)
> http://gcc.gnu.org/ml/gcc-testresults/2010-05/msg00472.html (4.4 works)
>
> The detailed test suite logs show that _every_ -findirect-dispatch test case
> SEGFAULTs shortly after startup.
>
> I've bisected trunk and identified r155622 as the cause:
>
> Author: jakub
> Date: Mon Jan 4 16:02:41 2010
> New Revision: 155622
>
> URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155622
> Log:
> PR driver/42442
> * gcc.c (SWITCH_IGNORE_PERMANENTLY): Define.
> (do_self_spec): For switches with SWITCH_IGNORE set set also
> SWITCH_IGNORE_PERMANENTLY.
> (check_live_switch): Check SWITCH_IGNORE_PERMANENTLY instead
> of SWITCH_IGNORE.
>
> [...]
>
> The main difference is that in the working compiler, the java classes are
> assembled with -K PIC but the generated main() is not, while in the broken
> compiler both the java classes and the generated main() are assembled with -K
> PIC.
Thanks for the detailed analysis.
> I note that gcc/java/jvspec.c has %<findirect-dispatch, and that PR42442 is
> about correcting the handling of %<match=native. Clearly something here
> doesn't mix well.
My interpretation is that the %<findirect-dispatch for cc1 used to cancel the
effect of -findirect-dispatch for subsequent programs invoked by the driver, in
particular 'as' in this case. Jakub's change disables this cancellation so
-findirect-dispatch is passed to 'as' and thus the kludge I put in ASM_SPEC for
Linux triggers, which breaks because cc1 hasn't compiled the file in PIC mode.
--
ebotcazou at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2010-09-20 21:40:00 |2010-09-21 21:45:21
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44095
