[Bug bootstrap/58509] New: [4.9 regression] ICE in calc_dfs_tree, at dominance.c:397 breaks Ada bootstrap on sparc64-linux

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58509

            Bug ID: 58509
           Summary: [4.9 regression] ICE in calc_dfs_tree, at
                    dominance.c:397 breaks Ada bootstrap on sparc64-linux
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mikpe at it dot uu.se
              Host: sparc64-linux
            Target: sparc-linux
             Build: sparc-linux

Attempting to bootstrap gcc-4.9-20130922 on sparc64-linux fails with:

/mnt/scratch/objdir49/./gcc/xgcc -B/mnt/scratch/objdir49/./gcc/
-B/mnt/scratch/install49/sparc-unknown-linux/bin/
-B/mnt/scratch/install49/sparc-unknown-linux/lib/ -isystem
/mnt/scratch/install49/sparc-unknown-linux/include -isystem
/mnt/scratch/install49/sparc-unknown-linux/sys-include    -c -g -O2  -fPIC  -W
-Wall -gnatpg -nostdinc   g-awk.adb -o g-awk.o
+===========================GNAT BUG DETECTED==============================+
| 4.9.0 20130922 (experimental) (sparc-unknown-linux) GCC error:           |
| in calc_dfs_tree, at dominance.c:397                                     |
| Error detected around g-awk.adb:264:9                                    |
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.            |
| Use a subject line meaningful to you and us to track the bug.            |
| Include the entire contents of this bug box in the report.               |
| Include the exact gcc or gnatmake command that you entered.              |
| Also include sources listed below in gnatchop format                     |
| (concatenated together with no headers between files).                   |
+==========================================================================+

Please include these source files with error report
Note that list may not be accurate in some cases,
so please double check that the problem can still
be reproduced with the set of files listed.
Consider also -gnatd.n switch (see debug.adb).

system.ads
g-awk.adb
g-awk.ads
gnat.ads
ada.ads
a-finali.ads
s-finroo.ads
g-regpat.ads
s-regpat.ads
a-except.ads
s-parame.ads
s-stalib.ads
a-unccon.ads
s-traent.ads
a-textio.ads
a-ioexce.ads
a-stream.ads
s-ficobl.ads
interfac.ads
i-cstrea.ads
s-crtl.ads
s-wchcon.ads
a-string.ads
a-strunb.ads
a-strmap.ads
a-charac.ads
a-chlat1.ads
a-strfix.ads
a-uncdea.ads
g-dirope.ads
g-dyntab.ads
g-os_lib.ads
s-os_lib.ads
s-string.ads
s-exctab.ads
a-tags.ads
s-stoele.ads
s-stoele.adb
s-soflin.ads
s-stache.ads
s-finmas.ads
s-stopoo.ads
s-pooglo.ads
s-unstyp.ads
s-stratt.ads
s-secsta.ads
s-stposu.ads
s-ststop.ads
s-imgint.ads
s-valint.ads
s-valrea.ads
g-dyntab.adb
g-hesorg.ads
s-memory.ads
g-hesorg.adb


raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:432
make[7]: *** [g-awk.o] Error 1
make[7]: Leaving directory `/mnt/scratch/objdir49/gcc/ada/rts'
make[6]: *** [gnatlib] Error 2
make[6]: Leaving directory `/mnt/scratch/objdir49/gcc/ada'
make[5]: *** [gnatlib-shared-default] Error 2
make[5]: Leaving directory `/mnt/scratch/objdir49/gcc/ada'
make[4]: *** [gnatlib-shared-dual] Error 2
make[4]: Leaving directory `/mnt/scratch/objdir49/gcc/ada'
make[3]: *** [gnatlib-shared] Error 2
make[3]: Leaving directory `/mnt/scratch/objdir49/gcc/ada'
make[2]: *** [gnatlib-shared] Error 2
make[2]: Leaving directory `/mnt/scratch/objdir49/sparc-unknown-linux/libada'
make[1]: *** [all-target-libada] Error 2
make[1]: Leaving directory `/mnt/scratch/objdir49'
make: *** [bootstrap] Error 2

The previous weekly snapshot, gcc-4.9-20130915, bootstrapped fine on this
machine.  I haven't seen this failure on x86_64 or powerpc64 (armv5tel is still
building).

Configuration options:
--prefix=/mnt/scratch/install48
--with-gmp=/home/mikpe/pkgs/linux-sparc64/gmp-5.1.2
--with-mpfr=/home/mikpe/pkgs/linux-sparc64/mpfr-3.1.2
--with-mpc=/home/mikpe/pkgs/linux-sparc64/mpc-1.0.1 --enable-multilib
--disable-plugin --disable-lto --disable-nls --enable-threads=posix
--enable-checking=release --disable-libmudflap
--enable-languages=c,c++,fortran,ada --build=sparc-unknown-linux
--target=sparc-unknown-linux --with-cpu=ultrasparc --enable-targets=all