[Bug fortran/48788] New: [4.6/4.7 Regression] ICE: SIGSEGV in resolve_global_procedure (resolve.c:2190) on invalid (?) fortran code

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48788

           Summary: [4.6/4.7 Regression] ICE: SIGSEGV in
                    resolve_global_procedure (resolve.c:2190) on invalid
                    (?) fortran code
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: zso...@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 24113
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24113
reduced testcase

Compiler output:
$ gfortran testcase.f90
testcase.f90:3.31:

  character(4), external :: foo
                               1
Error: Return type mismatch of function 'foo' at (1) (CHARACTER(1)/REAL(4))
==3307== Invalid read of size 8
==3307==    at 0x55C8D2: resolve_global_procedure (resolve.c:2190)
==3307==    by 0x560A8D: gfc_resolve_expr (resolve.c:3005)
==3307==    by 0x5684C9: resolve_code (resolve.c:9028)
==3307==    by 0x56A84E: resolve_codes (resolve.c:13614)
==3307==    by 0x55C32B: gfc_resolve (resolve.c:13641)
==3307==    by 0x5522BA: gfc_parse_file (parse.c:4200)
==3307==    by 0x58B175: gfc_be_parse_file (f95-lang.c:250)
==3307==    by 0x95E2BB: toplev_main (toplev.c:579)
==3307==    by 0x644AB6C: (below main) (in /lib64/libc-2.11.3.so)
==3307==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==3307== 
f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r172960 - crash
4.6 r172337 - crash
4.5 r172337 - code is accepted