[Bug 214965] Mk/Uses/fortran.mk lang/gcc: bump PORTREVISION of ports using gfortran

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214965

            Bug ID: 214965
           Summary: Mk/Uses/fortran.mk lang/gcc: bump PORTREVISION of
                    ports using gfortran
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: thierry at FreeBSD.org
                CC: freebsd-ports-bugs at FreeBSD.org

Created attachment 177558
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177558&action=edit
Example from french/aster configure

After the upgrade of lang/gcc to gcc-4.9.4, and thus the upgrade of gfortran,
all PORTREVISION of ports installing libraries built with gfortran should have
been bumped.

Without that, packages built with the previous version and mixed with the
current version abort with the following message:

/lib/libgcc_s.so.1: version GCC_4.6.0 required by
/usr/local/lib/gcc49/libgfortran.so.3 not found

How to reproduce the error, e.g. with blas lapack:

- compile the attached test.c with
cc -c -O2 -pipe -fstack-protector -fno-strict-aliasing -fPIC  test.c -c -o
test.c.1.o

- link it with
cc -Wl,--allow-multiple-definition -Wl,-rpath=/usr/local/lib/gcc49
-Wl,-rpath=/usr/local/lib/gcc49 -L/usr/local/lib/gcc49 -B/usr/local/bin
-L/usr/local/lib test.c.1.o -o testprog -Wl,-Bstatic -Wl,-Bdynamic
-L/usr/local/lib -lblas -llapack -lgfortran -lm -lkvm -Xlinker -export-dynamic
-lutil -lpthread -lz

- run
./testprog
/lib/libgcc_s.so.1: version GCC_4.6.0 required by
/usr/local/lib/gcc49/libgfortran.so.3 not found

- Bump PORTREVISION of math/lapack
- rebuild math/lapack and math/blas
- redo the previous test
  => no more error!

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