[MacPorts] #55149: mediainfo @0.7.99 fails to build on SnowLeopard, Mac OS X 10.6.8, because of "Undefined symbols for architecture x86_64"

[MacPorts]

#55149: mediainfo @0.7.99 fails to build on SnowLeopard, Mac OS X 10.6.8, because
of "Undefined symbols for architecture x86_64"
------------------------+-------------------------
  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:  snowleopard
      Port:  mediainfo  |
------------------------+-------------------------

Comment (by kencu):

 Yet another build that does not specify the `-stdlib=libc++` on the build
 line, so your system adds the wrong one by default. It's probably the
 cause of this error.

 builds fine for me, with my slightly modified clang-3.9:
 {{{
 $ port -v installed mediainfo
 The following ports are currently installed:
   mediainfo @0.7.98_0 (active) platform='darwin 10' archs='x86_64'
 date='2017-10-22T16:43:30-0700'
 }}}

 Try this fix:

 {{{
 configure.cxxflags-append  -stdlib=libc++
 configure.ldflags-append   -stdlib=libc++
 }}}
 If that doesn't fix it, you could try the fix I used in `botan`:
 {{{
 # add the selected -stdlib to clang builds
 # see https://trac.macports.org/ticket/53123
 if {[string match *clang* ${configure.cxx}]} {
     configure.cxx ${configure.cxx} -stdlib=${configure.cxx_stdlib}
 }
 }}}

 If you get tired of doing this, the slightly modified clang-3.9 I use is
 available here
 <https://github.com/kencu/SnowLeopardPorts/tree/master/lang/llvm-3.9> and
 the working part is this tiny patch, that makes clang-3.9 deliver
 `-stdlib=libc++` if there is none specified on the build line, instead of
 `-stdlib=libstdc++` as it is doing for you now.

--
Ticket URL: <https://trac.macports.org/ticket/55149#comment:1>
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