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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/100820] New: [12 regression] bootstrap hangs during
 stage2 on power 10
Date: Fri, 28 May 2021 18:44:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100820

            Bug ID: 100820
           Summary: [12 regression] bootstrap hangs during stage2 on power
                    10
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:a8764071f2eb6b4cdc9ecb788dfaa2b095b52598, r12-1020

Author: Aaron Sawdey <acsawdey@linux.ibm.com>
Date:   Tue Mar 2 18:06:37 2021 -0600
    Fusion patterns for add-logical/logical-add

This is causing a hang during stage2 of bootstrapping for trunk on power 10=
.  I
tried r12-1019 and it was fine.

Here is one example that happens when configure is running:

. . .
checking for powerpc64le-unknown-linux-gnu-gfortran...
/home/seurer/gcc/git/build/gcc-trunk-bootstrap/./gcc/gfortran
-B/home/seurer/gcc/git/build/gcc-trunk-bootstrap/./gcc/
-B/home/seurer/gcc/git/install/gcc-trunk-bootstrap/powerpc64le-unknown-linu=
x-gnu/bin/
-B/home/seurer/gcc/git/install/gcc-trunk-bootstrap/powerpc64le-unknown-linu=
x-gnu/lib/
-isystem
/home/seurer/gcc/git/install/gcc-trunk-bootstrap/powerpc64le-unknown-linux-=
gnu/include
-isystem
/home/seurer/gcc/git/install/gcc-trunk-bootstrap/powerpc64le-unknown-linux-=
gnu/sys-include
  -fno-checking
checking whether we are using the GNU Fortran compiler...=20
(and here it hangs)


3912958 pts/0    R+     2:12
/home/seurer/gcc/git/build/gcc-trunk-bootstrap/./gcc/f951 conftest.F
-ffixed-form -cpp=3D/tmp/cc5vO5dZ.f90 -quiet -iprefix
/home/seurer/gcc/git/build/gcc-trunk-bootstrap/gcc/../lib/gcc/powerpc64le-u=
nknown-linux-gnu/12.0.0/
-isystem /home/seurer/gcc/git/build/gcc-trunk-bootstrap/./gcc/include -isys=
tem
/home/seurer/gcc/git/build/gcc-trunk-bootstrap/./gcc/include-fixed -isystem
/home/seurer/gcc/git/install/gcc-trunk-bootstrap/powerpc64le-unknown-linux-=
gnu/include
-isystem
/home/seurer/gcc/git/install/gcc-trunk-bootstrap/powerpc64le-unknown-linux-=
gnu/sys-include
conftest.F -quiet -dumpbase conftest.F -dumpbase-ext .F -mcpu=3Dpower10
-fno-checking -fintrinsic-modules-path finclude
-fpre-include=3D/usr/include/finclude/math-vector-fortran.h -o /tmp/cc6Kgdb=
r.s

This should finish almost instantly but never does.

seurer@ltcden2-lp1:~/gcc/git/build/gcc-trunk-bootstrap$ cat
./powerpc64le-unknown-linux-gnu/libgomp/conftest.F
      program main
#ifndef __GNUC__
       choke me
#endif

      end=