"Moore, Catherine" <catherine_mo...@mentor.com> writes:
> Hi Richard,
>
> I updated this patch using your suggestions. I'm having a problem
> though, that I'm having trouble nailing. Building libstdc++ for
> microMIPS is failing trying to generate dwarf2 CFI info:
>
> _Unwind_Ptr base_of_encoded_value(unsigned char, _Unwind_Context*)
> Analyzing compilation unit
> Performing interprocedural optimizations
> <*free_lang_data> <visibility> <early_local_cleanups> <*free_inline_summary>
> <whole-program> <profile_estimate> <cp> <inline> <pure-const>
> <static-var>Assembling functions:
> _Unwind_Ptr base_of_encoded_value(unsigned char, _Unwind_Context*)
> mm.cc: In function '_Unwind_Ptr base_of_encoded_value(unsigned char,
> _Unwind_Context*)':
> mm.cc:34:1: internal compiler error: in maybe_record_trace_start, at
> dwarf2cfi.c:2209
> 0x8570656 maybe_record_trace_start
> /scratch/cmoore/umips-elf/src/gcc-4.7-2012.09/gcc/dwarf2cfi.c:2209
> 0x857113f create_trace_edges
> /scratch/cmoore/umips-elf/src/gcc-4.7-2012.09/gcc/dwarf2cfi.c:2301
> 0x8572505 scan_trace
> /scratch/cmoore/umips-elf/src/gcc-4.7-2012.09/gcc/dwarf2cfi.c:2514
> 0x85726b3 create_cfi_notes
> /scratch/cmoore/umips-elf/src/gcc-4.7-2012.09/gcc/dwarf2cfi.c:2540
> 0x8572703 execute_dwarf2_frame
> /scratch/cmoore/umips-elf/src/gcc-4.7-2012.09/gcc/dwarf2cfi.c:2897
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://support.codesourcery.com/GNUToolchain/> for instructions.
>
> I've attached a testcase hoping that you might have some ideas. I
> plan to keep debugging in the meanwhile. I was able to reproduce with
> ./cc1plus -mmicromips -Os mm.ii.
Ah, sorry, I expect it should be:
mips_epilogue_set_cfa (stack_pointer_rtx, 0);
instead of:
mips_epilogue_emit_cfa_restores ();
It would probably be better to call mips_epilogue_set_cfa immediately
after emitting the jraddiusp, if that works (in which case making the
assert conditional is OK).
Richard
