[MacPorts] #58208: gcc8 @8.3.0: binary, does not pull in correct version of isl

[MacPorts]

#58208: gcc8 @8.3.0: binary, does not pull in correct version of isl
---------------------+--------------------
  Reporter:  Tatsh   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.4
Resolution:          |   Keywords:
      Port:  gcc8    |
---------------------+--------------------
Description changed by Tatsh:

Old description:

> The distributed binary pulls in isl, but this provides
> {{{libisl.15.dylib}}} and gcc8 is expecting to see {{{libisl.18.dylib}}}.
>
> OpenBLAS+gcc8 fails to build:
>
> /opt/local/bin/gfortran-mp-8 -O3 -m128bit-long-double -Wall -frecursive
> -m64 -fPIC -mavx2 -c -o spotrf
> 2.o spotrf2.f
> dyld: Library not loaded: /opt/local/lib/libisl.19.dylib
>   Referenced from: /opt/local/libexec/gcc/x86_64-apple-
> darwin18/8.3.0/f951
>   Reason: image not found
> gfortran-mp-8: internal compiler error: Abort trap: 6 signal terminated
> program f951

New description:

 The distributed binary pulls in isl, but this provides
 {{{libisl.15.dylib}}} and gcc8 is expecting to see {{{libisl.18.dylib}}}.

 OpenBLAS+gcc8 fails to build:

 {{{
 /opt/local/bin/gfortran-mp-8 -O3 -m128bit-long-double -Wall -frecursive
 -m64 -fPIC -mavx2 -c -o spotrf
 2.o spotrf2.f
 dyld: Library not loaded: /opt/local/lib/libisl.19.dylib
   Referenced from: /opt/local/libexec/gcc/x86_64-apple-darwin18/8.3.0/f951
   Reason: image not found
 gfortran-mp-8: internal compiler error: Abort trap: 6 signal terminated
 program f951
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58208#comment:1>
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