[Bug fortran/36825] [F2008] Rank > 7 arrays [will break library ABI] libgfortran I/O+intrinsics:

[Bug fortran/36825] [F2008] Rank > 7 arrays [will break library ABI] libgfortran I/O+intrinsics:

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36825

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #12 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-09-15 13:09:15 UTC ---
We also need to update dwarf2out.h, which has:

266struct array_descr_info
267{
268  int ndimensions;
269  tree element_type;
270  tree base_decl;
271  tree data_location;
272  tree allocated;
273  tree associated;
274  struct array_descr_dimen
275    {
276      tree lower_bound;
277      tree upper_bound;
278      tree stride;
279    } dimen[10];
280};

Thus, GCC limits the maximal rank to 10.

[Bug fortran/36825] New: Problems with dimensions > 7

[burnus at gcc dot gnu dot org]

gfortran 4.4 allows 15 instead of 7 dimensions, however, it has some problems
with that:

gfortran -std=f95 -Wall -pedantic should print a message for:

integer,parameter                        :: N=10
complex,dimension(-N:N,-N:N,0:1,0:1,-N:N,-N:N,0:1,0:1)   :: P
end

But it does not. This seems to be an off-by-one error as for 9 dimensions an
error is printed:
  Error: Fortran 2008: Array specification at (1) with more than 7 dimensions

  * * *

More seriously, adding a PRINT causes an IDE:

a.f90:1: internal compiler error: in gfc_get_dtype, at
fortran/trans-types.c:1254

integer,parameter                        :: N=10
complex,dimension(-N:N,-N:N,0:1,0:1,-N:N,-N:N,0:1,0:1)   :: P
print *, p
end


-- 
           Summary: Problems with dimensions > 7
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, diagnostic
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36825

[Bug fortran/36825] F2008: Rank > 7 arrays [will break library ABI] libgfortran I/O+intrinsics:

[jvdelisle at gcc dot gnu dot org]

------- Comment #11 from jvdelisle at gcc dot gnu dot org  2009-08-15 02:17 -------
Updating summary to reflect the focus of this PR.


-- 

jvdelisle at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|F2008: libgfortran          |F2008: Rank > 7 arrays
                   |I/O+intrinsics: Rank > 7    |[will break library ABI]
                   |arrays  [will break         |libgfortran I/O+intrinsics:
                   |presumably break library    |
                   |ABI]                        |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36825