------- 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