Between rev 163993 and 164013, mainline bootstrap started failing on Solaris 2 SPARC. The stage2 libgcc fails to configure because the stage2 xgcc gets a SIGBUS for
% ../../xgcc -B../../gcc/ -c -g -O2 conftest.c Bus Error Running xgcc under gdb, I find that the crash happens here: Program received signal SIGSEGV, Segmentation fault. generate_option_input_file (argc=<value optimized out>, argv=<value optimized out>, lang_mask=<value optimized out>, decoded_options=0xffbff394, decoded_options_count=0xffbff390) at /vol/gcc/src/hg/trunk/local/gcc/opts-common.c:750 1: x/i $pc => 0x28584 <decode_cmdline_options_to_array+168>: clrx [ %l0 + 0x18 ] %lo+0x18 isn't 8-byte aligned at that point. Comparing the assembler code between the working and failing versions, I find that the following change has happened: decode_cmdline_options_to_array+0xa4: c0 24 20 14 clr [%l0 + 0x14] - decode_cmdline_options_to_array+0xa8: c0 24 20 18 clr [%l0 + 0x18] - decode_cmdline_options_to_array+0xac: c0 24 20 1c clr [%l0 + 0x1c] - decode_cmdline_options_to_array+0xb0: c4 24 20 24 st %g2, [%l0 + 0x24] + decode_cmdline_options_to_array+0xa8: c0 74 20 18 clrx [%l0 + 0x18] + decode_cmdline_options_to_array+0xac: c4 24 20 24 st %g2, [%l0 + 0x24] i.e. two clr insns (which are ok with 4-byte alignment) have been replaced by a single clrx. I'll start a reghunt to find the culprit patch. -- Summary: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: ro at gcc dot gnu dot org GCC build triplet: sparc-sun-solaris2* GCC host triplet: sparc-sun-solaris2* GCC target triplet: sparc-sun-solaris2* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611