[Bug c/66747] New: The commit r225260 broke the builds of the mips-{mti,img}-linux-gnu tool chains.

["doug.gilmore at imgtec dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66747

            Bug ID: 66747
           Summary: The commit r225260 broke the builds of the
                    mips-{mti,img}-linux-gnu tool chains.
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doug.gilmore at imgtec dot com
  Target Milestone: ---

The commit r225260 broke the builds of the mips-{mti,img}-linux-gnu tool
chains.

To reproduce the problem, configure the binutils build from the directory
/scratch/d/obj-mips-img-linux-gnu/binutils-gdb:


/scratch/d/src/binutils-gdb/configure
--prefix=/scratch/d/install-mips-img-linux-gnu --target=mips-img-linux-gnu
--with-sysroot=/scratch/d/install-mips-img-linux-gnu/sysroot
then run make and make install

Then configure the gcc build from the directory
/scratch/d/obj-mips-img-linux-gnu/initial_gcc:
/scratch/d/src/gcc/configure --prefix=/scratch/d/install-mips-img-linux-gnu
--disable-libssp --disable-libgomp --disable-libmudflap --disable-decimal-float
--with-mips-plt --target=mips-img-linux-gnu --enable-languages=c
--without-headers --disable-shared --disable-threads --disable-libquadmath
--disable-libatomic
running make fails with:

/scratch/d/obj-mips-img-linux-gnu/initial_gcc/./gcc/xgcc
-B/scratch/d/obj-mips-img-linux-gnu/initial_gcc/./gcc/
-B/scratch/d/install-mips-img-linux-gnu/mips-img-linux-gnu/bin/
-B/scratch/d/install-mips-img-linux-gnu/mips-img-linux-gnu/lib/ -isystem
/scratch/d/install-mips-img-linux-gnu/mips-img-linux-gnu/include -isystem
/scratch/d/install-mips-img-linux-gnu/mips-img-linux-gnu/sys-include    -g -O2
-minterlink-mips16 -mips64r6 -O2 -g -O2 -minterlink-mips16 -DIN_GCC 
-DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include  -I. -I. -I../../../.././gcc -I/scratch/d/src/gcc/libgcc
-I/scratch/d/src/gcc/libgcc/. -I/scratch/d/src/gcc/libgcc/../gcc
-I/scratch/d/src/gcc/libgcc/../include   -g0  -finhibit-size-directive
-fno-inline -fno-exceptions -fno-zero-initialized-in-bss -fno-toplevel-reorder
-fno-tree-vectorize -fbuilding-libgcc -fno-stack-protector  -Dinhibit_libc -I.
-I. -I../../../.././gcc -I/scratch/d/src/gcc/libgcc
-I/scratch/d/src/gcc/libgcc/. -I/scratch/d/src/gcc/libgcc/../gcc
-I/scratch/d/src/gcc/libgcc/../include  -o crtbeginT.o -MT crtbeginT.o -MD -MP
-MF crtbeginT.dep  -c /scratch/d/src/gcc/libgcc/crtstuff.c -DCRT_BEGIN
-DCRTSTUFFT_O
/scratch/d/src/gcc/libgcc/crtstuff.c: In function 'frame_dummy':
/scratch/d/src/gcc/libgcc/crtstuff.c:490:1: error: unrecognizable insn:
 }
 ^
(insn 82 67 8 (sequence [
            (jump_insn 7 67 66 (set (pc)
                    (if_then_else (eq (reg/f:SI 2 $2 [197])
                            (const_int 0 [0]))
                        (label_ref:SI 15)
                        (pc))) /scratch/d/src/gcc/libgcc/crtstuff.c:470 466
{*branch_equalitysi}
                 (expr_list:REG_DEAD (reg/f:SI 2 $2 [197])
                    (int_list:REG_BR_PROB 3017 (nil)))
             -> 15)
            (insn/f 66 7 8 (set (mem/c:DI (plus:SI (reg/f:SI 29 $sp)
                            (const_int 8 [0x8])) [5  S8 A64])
                    (reg:DI 31 $31)) 302 {*movdi_64bit}
                 (expr_list:REG_FRAME_RELATED_EXPR (set/f (mem/c:DI (plus:SI
(reg/f:SI 29 $sp)
                                (const_int 8 [0x8])) [5  S8 A64])
                        (reg:DI 31 $31))
                    (nil)))
        ]) /scratch/d/src/gcc/libgcc/crtstuff.c:470 -1
     (nil))

We are working around the issue by reverting r225260.