[Bug fortran/48889] New: f951: internal compiler error: in gfc_is_constant_expr, at fortran/expr.c:906

["wence at gmx dot li" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48889

           Summary: f951: internal compiler error: in
                    gfc_is_constant_expr, at fortran/expr.c:906
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wence@gmx.li


Created attachment 24190
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24190
Two module files plus f90 source

I'm attempting to compile fluidity
(http://amcg.ese.ic.ac.uk/index.php?title=Fluidity) with gfortran 4.6.0 and
have hit the above error.

The problem can be reproduced with the two module files and single test.f90
attached in a tarball.  Source for the module files is large, with many
dependencies.  If necessary I can try and reduce these to a minimal size as
well.

$uname -a
Linux xxx 2.6.18-194.3.1.el5 #1 SMP Fri May 7 01:43:09 EDT 2010 x86_64 x86_64
x86_64 GNU/Linux

Compile output:

$ gfortran -v -save-temps -O0 test.f90 

Driving: gfortran -v -save-temps -O0 test.f90 -l gfortran -l m -shared-libgcc
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/home/lmitche4/Apps/gcc-4.6.0/libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --prefix=/home/lmitche4/Apps/gcc-4.6.0 -C
--disable-gcj --enable-languages=c,c++,fortran,objc,obj-c++
Thread model: posix
gcc version 4.6.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O0' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /home/lmitche4/Apps/gcc-4.6.0/libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/f951
test.f90 -quiet -dumpbase test.f90 -mtune=generic -march=x86-64 -auxbase test
-O0 -version -fintrinsic-modules-path
/home/lmitche4/Apps/gcc-4.6.0/lib/gcc/x86_64-unknown-linux-gnu/4.6.0/finclude
-o test.s
GNU Fortran (GCC) version 4.6.0 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.6.0, GMP version 5.0.1, MPFR version 3.0.1,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU Fortran (GCC) version 4.6.0 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.6.0, GMP version 5.0.1, MPFR version 3.0.1,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
f951: internal compiler error: in gfc_is_constant_expr, at fortran/expr.c:906
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


e->symtree is NULL causing a failure of gcc_assert.  I do not understand why.

Cheers,

Lawrence