[MacPorts] #57751: qt4-mac: lots of errors trying to build with clang-7.0 (presumably related to defaulting to c++17 mode)

[MacPorts]

#57751: qt4-mac: lots of errors trying to build with clang-7.0 (presumably related
to defaulting to c++17 mode)
----------------------+-----------------------
  Reporter:  kencu    |      Owner:  michaelld
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  qt4-mac  |
----------------------+-----------------------

Comment (by kencu):

 Hmmm. This block is supposed to be blacklisting clang-9.0:
 {{{
 compiler.blacklist-append { clang <= 503 } \
     gcc-3.3 *gcc-4.0 macports-gcc* \
     { macports-clang-[6-9].0 }
 }}}
 I wonder why the port is still trying to build with clang-9.0 despite
 this.

 It says:
 {{{
 Warning: All compilers are either blacklisted or unavailable; defaulting
 to first fallback option
 }}}
 but -- clang-5.0 is supposed to be on the compiler list for `10.6.8`...

-- 
Ticket URL: <https://trac.macports.org/ticket/57751#comment:12>
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