[MacPorts] #53625: qscintilla: requires C++11, not using the right compiler

[MacPorts]

#53625: qscintilla: requires C++11, not using the right compiler
-------------------------+-----------------------
  Reporter:  mojca       |      Owner:  michaelld
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  qscintilla  |
-------------------------+-----------------------

Comment (by mojca):

 Compare the following:
 {{{
 > clang++-mp-4.0 -stdlib=libc++ test.cpp -o test
 # OK
 }}}
 {{{
 > clang++-mp-4.0 -stdlib=libstdc++ test.cpp -o test
 test.cpp:1:10: fatal error: 'regex' file not found
 #include <regex>
          ^~~~~~~
 1 error generated.
 }}}
 {{{
 > clang++-mp-4.0 -stdlib=macports-libstdc++ test.cpp -o test
 In file included from test.cpp:1:
 In file included from /opt/local/include/gcc6/c++/regex:35:
 /opt/local/include/gcc6/c++/bits/c++0x_warning.h:32:2: error: This file
 requires compiler and library support for the ISO C++ 2011 standard. This
 support must be
       enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support \
  ^
 1 error generated.
 }}}
 Maybe Marcus just needs to improve his patch for `macports-libstdc++`.

 > What would be ideal is if the default CXXFLAGS were "-std=c++98" or
 whatever. Then if C++11 is desired, we swap that to "-std=c++11
 -Wc++11-extension". Likewise for C++14 or C++17, assuming the updated -W
 is valid for those. Basically: Try to force the compiler to a certain
 standard & warn if not abiding by it.
 I'm not particularly happy about this idea. Clang already works painlessly
 in most cases, C++98 soucres compile just fine under C++11 compiler, it's
 just the recent change with `-stdlib=macports-libstdc++` that could be
 improved and use C++11 by default. Note that this `macports-libstdc++` is
 pretty experimental.

 If we force the C++98 flag, we are just calling for a huge number of
 broken port.

 PS: playing on 10.7.

--
Ticket URL: <https://trac.macports.org/ticket/53625#comment:15>
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