Segment fault s-attrtab genattrtab

[bruce m beach]

Hello all

I have been trying for a long time to build gcc-4.9.2 and now
gcc-5.1.0-RC-20150412 but it always dies with:

make[2]: *** [s-attrtab] Segmentation fault (core dumped)

I did succeed once for some unknown reason with gcc-4.9.2,
installed it and built the entire system with it but it
absolutely refuses to build itself. The same for
gcc-5.1.0-RC-20150412 and now gcc-5.1.0. Any help is welcome.
below are some details:

System
------
armv7l-unknown-linux-gnueabihf

Configure
---------
../gcc-5.1.0-RC-20150412/configure --enable-languages=c,c++ --disable-bootstrap

Tail end of make before the error
---------------------------------

make[2]: Entering directory '/tmp/gcc_build/gcc'
build/genattrtab ../../gcc-5.1.0-RC-20150412/gcc/common.md
../../gcc-5.1.0-RC-20150412/gcc/config/arm/arm.md insn-conditions.md \
        -Atmp-attrtab.c -Dtmp-dfatab.c -Ltmp-latencytab.c
Makefile:2147: recipe for target 's-attrtab' failed
make[2]: *** [s-attrtab] Segmentation fault (core dumped)
make[2]: Leaving directory '/tmp/gcc_build/gcc'
Makefile:4120: recipe for target 'all-gcc' failed
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory '/tmp/gcc_build'
Makefile:873: recipe for target 'all' failed
make: *** [all] Error 2

Some output from gdb
--------------------

gcc_build>gdb gcc/build/genattrtab gcc/core
Reading symbols from gcc/build/genattrtab...done.

[New LWP 14821]
Core was generated by `build/genattrtab
../../gcc-5.1.0-RC-20150412/gcc/common.md ../../gcc-5.1.0-RC-2'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0004524c in attr_hash_table ()

(gdb) where

#0  0x0004524c in attr_hash_table ()
#1  0x0001b460 in rtx_equal_p (x=<optimized out>, y=<optimized out>)
    at ../../gcc-5.1.0-RC-20150412/gcc/rtl.c:628
#2  0xfffffffe in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

(gdb) thread apply all bt

Thread 1 (LWP 14821):
#0  0x0004524c in attr_hash_table ()
#1  0x0001b460 in rtx_equal_p (x=<optimized out>, y=<optimized out>)
    at ../../gcc-5.1.0-RC-20150412/gcc/rtl.c:628
#2  0xfffffffe in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)