[Bug tree-optimization/58532] [4.9 Regression] bootstrap failure with BOOT_CFLAGS="-g -O3"

["dcb314 at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58532

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Richard Biener from comment #2)
> How exactly did it fail for you?

I tried

../src/trunk/configure --prefix=/home/dcb/gcc/results --enable-checking=yes
--enable-languages=c,c++,fortran --disable-werror

and that failed thusly

Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/fortran/parse.o differs
make[2]: *** [compare] Error 1
make[2]: Leaving directory `/home/dcb/gcc/working.ok'
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory `/home/dcb/gcc/working.ok'
make: *** [bootstrap] Error 2

and I tried 

../src/trunk/configure --prefix=/home/dcb/gcc/results --enable-checking=yes
--enable-languages=c,c++,fortran

and that failed like this

In file included from ../../src/trunk/gcc/function.h:27:0,
                 from ../../src/trunk/gcc/df-scan.c:32:
../../src/trunk/gcc/df-scan.c: In function âvoid
df_ref_record.constprop(df_collection_rec*, rtx, basic_block, df_insn_info*,
df_ref_type, int)â:
../../src/trunk/gcc/hard-reg-set.h:156:44: error: array subscript is above
array bounds [-Werror=array-bounds]
   (!!((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \
                                            ^

Both bootstraps on AMD Phenom Redhat Linux