[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

--- Comment #2 from Jan Beich <jbeich at FreeBSD.org> ---
Created attachment 155839
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155839&action=edit
v0

Maybe use undocumented argument separator (comma) for simplicity.

  $ make USES="compiler:c++11-lib,openmp" -V IGNORE -V _COMPILER_ARGS -V
compiler_ARGS

  features c++11-lib env openmp features
  c++11-lib openmp

  $ make USES="compiler:features,foo" -V IGNORE -V _COMPILER_ARGS -V
compiler_ARGS
  Invalid argument "foo", valid arguments are: c++11-lib c++11-lang c11
features openmp env nestedfct c++0x gcc-c++11-lib

  features foo

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