[Bug 224971] devel/qt5-qmake: fails to build when CXX contains absolute path

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224971

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: rakuco
Date: Sun Jan  7 15:03:08 UTC 2018
New revision: 458339
URL: https://svnweb.freebsd.org/changeset/ports/458339

Log:
  Correctly pass -platform to qtbase's configure script when CXX is an absolute
path.

  With the update to Qt 5.9.3, the configure script and qmake expect an mkspec
  name, not an absolute path, which is why r458293 switched to using
  ${QMAKESPEC:T}.

  However, the :T modifier breaks things when CXX is set to an absolute path
  instead of just "c++", QMAKE_COMPILER is a shell string that will be
evaluated
  only after make invokes `configure' with CONFIGURE_ARGS. In other words, we
end
  up turning something like

      $$(ccver="$$(/usr/bin/c++ --version)"; case "$$ccver" in *clang*) echo
clang ;; *) echo g++ ;; esac)

  into

      /c++ --version)"; case "$$ccver" in *clang*) echo clang ;; *) echo g++ ;;
esac)

  which is obviously invalid.

  We now just avoid being too smart and set a separate variable called
  QMAKESPECNAME, which contains only the mkspec name and that we use both when
  setting CONFIGURE_ARGS as well as to create QMAKESPEC.

  PR:           224971

Changes:
  head/Mk/bsd.qt.mk

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