[Bug fortran/58099] New: over-zealous Error pointer error checking in gfortran 4.8

["daniel.price at monash dot edu" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58099

            Bug ID: 58099
           Summary: over-zealous Error pointer error checking in gfortran
                    4.8
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: daniel.price at monash dot edu

I'm having an issue with gfortran 4.8 that is blocking compilation of my public
visualisation code SPLASH (reported by several users). The issue is to do with
mismatched properties of procedure pointers when the procedure being pointed to
has the pure attribute:

../src/kernels.f90:77.13:

    wfunc => w_wendlandc6
             1
Error: Interface mismatch in procedure pointer assignment at (1): Mismatch in
PURE attribute

While I can provide a workaround for this by removing the pure attribute, I
think this is either a bug or a feature that I don't understand, since it must
be possible to point to pure procedures with a procedure pointer. However, I
cannot find a way to do this that compiles with gfortran 4.8. Note that this is
only an issue in 4.8, did not exist in any previous version.

The relevant module is attached and can be compiled independently of any other
code, so should be easy to reproduce.

Please let me know if it is a bug/can be fixed or not.

Thanks,

Daniel Price

versioning as follows:
-------------
$ gfortran-mp-4.8 -v
Using built-in specs.
COLLECT_GCC=gfortran-mp-4.8
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin12/4.8.1/lto-wrapper
Target: x86_64-apple-darwin12
Configured with: ../gcc-4.8.1/configure --prefix=/opt/local
--build=x86_64-apple-darwin12
--enable-languages=c,c++,objc,obj-c++,lto,fortran,java
--libdir=/opt/local/lib/gcc48 --includedir=/opt/local/include/gcc48
--infodir=/opt/local/share/info --mandir=/opt/local/share/man
--datarootdir=/opt/local/share/gcc-4.8 --with-local-prefix=/opt/local
--with-system-zlib --disable-nls --program-suffix=-mp-4.8
--with-gxx-include-dir=/opt/local/include/gcc48/c++/ --with-gmp=/opt/local
--with-mpfr=/opt/local --with-mpc=/opt/local --with-ppl=/opt/local
--with-cloog=/opt/local --enable-cloog-backend=isl
--disable-cloog-version-check --enable-stage1-checking --disable-multilib
--enable-lto --enable-libstdcxx-time --with-as=/opt/local/bin/as
--with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar
--with-bugurl=https://trac.macports.org/newticket --with-pkgversion='MacPorts
gcc48 4.8.1_1'
Thread model: posix
gcc version 4.8.1 (MacPorts gcc48 4.8.1_1) 
-------------