[Bug fortran/56490] New: [4.6/4.7 Regression] -Wall triggering infinite loop

[o.flebbe@science-computing.de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56490

             Bug #: 56490
           Summary: [4.6/4.7 Regression] -Wall triggering infinite loop
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: o.flebbe@science-computing.de


Created attachment 29559
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29559
Testcase: Loops forever with -O2 -Wall

Compiling testcase, gfortran seems to loop forever.

gfortran -c -O -Wall testcase.f 

leaving out -Wall seems to compile o.k.


Have to problem on several independent gcc distros: This one for instance:

COLLECT_GCC=/usr/local/gcc-4.6.3/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc-4.6.3/libexec/gcc/x86_64-unknown-linux-gnu/4.6.3/lto-wrapper
Ziel: x86_64-unknown-linux-gnu
Konfiguriert mit: /soft/os/gcc/gcc-4.6.3/gcc-4.6.3/configure
--srcdir=/soft/os/gcc/gcc-4.6.3/gcc-4.6.3 --prefix=/usr/local/gcc-4.6.3
--with-included-gettext --enable-__cxa_atexit --enable-threads --enable-shared
--enable-languages=c,c++,fortran --enable-libgcj --enable-ssp --disable-libssp
--with-gmp-include=/usr/local/devel/gmp/5.0.1-static/include
--with-gmp-lib=/usr/local/devel/gmp/5.0.1-static/lib64
--with-mpfr-include=/usr/local/devel/mpfr/2.4.2-static/include
--with-mpfr-lib=/usr/local/devel/mpfr/2.4.2-static/lib64
--with-mpc-include=/usr/local/devel/mpc/0.8.1-static/include
--with-mpc-lib=/usr/local/devel/mpc/0.8.1-static/lib64
Thread-Modell: posix
gcc-Version 4.6.3 (GCC)