[Bug target/56942] New: MIPS GCC will not build with -mips16 mode because libgcc fails to build

[sje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56942



             Bug #: 56942

           Summary: MIPS GCC will not build with -mips16 mode because

                    libgcc fails to build

    Classification: Unclassified

           Product: gcc

           Version: 4.9.0

            Status: UNCONFIRMED

          Keywords: ice-on-valid-code

          Severity: normal

          Priority: P3

         Component: target

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: s...@gcc.gnu.org

            Target: mips*-*-*





While building a MIPS GCC that includes mips16 libraries I get an assertion

from GCC.  Here is a testcase cutdown from libgcc unwind-dw2.c:





enum dwarf_call_frame_info {

  DW_CFA_set_loc = 0x01 ,

  DW_CFA_advance_loc1 = 0x02 ,

  DW_CFA_advance_loc2 = 0x03 ,

  DW_CFA_GNU_args_size = 0x2e ,

  DW_CFA_GNU_negative_offset_extended = 0x2f

};

typedef struct { void *pc; } _Unwind_FrameState;

void execute_cfa_program (const unsigned char *insn_ptr,

                          const unsigned char *insn_end,

                          _Unwind_FrameState *fs)

{

    while (insn_ptr < insn_end)     {

        unsigned char insn = *insn_ptr++;

        void *reg;

        void *utmp;

    switch (insn)  {

          case DW_CFA_set_loc:    { }

          case DW_CFA_advance_loc1:    fs->pc += foo (insn_ptr) * 4;

          case DW_CFA_advance_loc2:    fs->pc += foo (insn_ptr) * 4;

          case DW_CFA_GNU_args_size:    insn_ptr = bar (insn_ptr, &utmp);

          case DW_CFA_GNU_negative_offset_extended:    insn_ptr = bar

(insn_ptr,

 &reg);

        }

   }

}





And here is the assertion I get:



gcc/cc1 -quiet -g -mips16 -O2 -minterlink-mips16 -fPIC -g

-I/local/home/sellcey/nightly/src x.c



x.c:25:1: internal compiler error: in output_555, at config/mips/mips.md:6024



0xb8fc19 output_555

    /local/home/sellcey/nightly/src/gcc/gcc/config/mips/mips.md:6024

0x6b60e2 final_scan_insn(rtx_def*, _IO_FILE*, int, int, int*)

    /local/home/sellcey/nightly/src/gcc/gcc/final.c:2853

0x6b6c8f final(rtx_def*, _IO_FILE*, int)

    /local/home/sellcey/nightly/src/gcc/gcc/final.c:1957

0x6b6eb9 rest_of_handle_final

    /local/home/sellcey/nightly/src/gcc/gcc/final.c:4332

Please submit a full bug report,

with preprocessed source if appropriate.