[Bug 199603] Mk/Uses/compiler.mk: cannot specify more than one argument

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199603

            Bug ID: 199603
           Summary: Mk/Uses/compiler.mk: cannot specify more than one
                    argument
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: freebsd-ports-bugs at FreeBSD.org

Currently, USES is designed to be parsed only once. This means any conditional
within the feature will only work for the first argument. A possible fix is to
workaround limitation by using feature-local variable like USES=python did.

Consider the following example which should default to GCC until Clang gains
OpenMP support.

  USES= compiler:c++11-lib compiler:openmp

then try

  $ make -V CC
  $ make -V compiler_ARGS

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