[Bug 241500] lang/beignet: installed with lang/pocl results in: LLVM ERROR: inconsistency in registered CommandLine options

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241500

            Bug ID: 241500
           Summary: lang/beignet: installed with lang/pocl results in:
                    LLVM ERROR: inconsistency in registered CommandLine
                    options
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: ohartmann at walstatt.org
                CC: x11 at FreeBSD.org
                CC: x11 at FreeBSD.org

This issue is long standing and with the recent ports tree and POCL 1.4 and
LLVM 8.0/LLVM 9.0 it can be reduced to the parallel installation of
lang/beignet (beignet-1.3.2_8 as for now). With lang/pocl installed, any OpenCL
using application fails with the error:

:  CommandLine Error: Option 'limited-coverage-experimental' registered more
than once! LLVM ERROR: inconsistency in registered CommandLine options

The problem can be simply reproduced by installing port devel/clinfo and/or
benchmarks/clpeak, issuing "clinfo" for instance on the command line, when
lang/pocl and lang/beignet are installed parallel.

This issue has been reported since POCL 0.14 (i.e. Bug 219562).

In all cases I've tested, devel/ocl-icd is also installed and used.

This issue has been reported upstream in 2017, see

https://github.com/pocl/pocl/issues/474

and has been also dicussed here with the LLVM backend:

https://bugs.llvm.org/show_bug.cgi?id=30587

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