[MacPorts] #53525: valgrind: doesn't build with an old clang

[MacPorts]

#53525: valgrind: doesn't build with an old clang
--------------------+----------------------
 Reporter:  mojca   |      Owner:  raimue
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:  lion    |       Port:  valgrind
--------------------+----------------------
 valgrind fails to build already at configure time if clang from xcode 425
 is used, complaining about too old compiler.

 A naive addition to the Portfile that blacklisted /usr/bin/clang++ and
 llvm-gcc-4.2 made the build succeed:
 {{{
 PortGroup           compiler_blacklist_versions 1.0
 compiler.blacklist  *gcc* {clang < 500}
 }}}
 but I didn't test macports-clang-3.3 or xcode 5. I'm also not sure whether
 the port needs some special handling about gcc (I don't understand what
 the rest of the portfile does).

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Ticket URL: <https://trac.macports.org/ticket/53525>
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