[MacPorts] #47648: clang-3.7: Subversion fetch fails if behind HTTP proxy

[MacPorts]

#47648: clang-3.7: Subversion fetch fails if behind HTTP proxy
----------------------+--------------------------------
 Reporter:  raimue@…  |      Owner:  jeremyhu@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:            |       Port:  clang-3.7 llvm-3.7
----------------------+--------------------------------
 As reported on IRC, the post-extract in the clang-3.7 port cannot be
 executed when behind a HTTP proxy:

 {{{
 :notice:extract --->  Extracting clang-3.7
 :debug:extract Executing org.macports.extract (clang-3.7)
 :debug:extract Executing proc-post-org.macports.extract-extract-0
 :info:extract svn: E120108: Unable to connect to a repository at URL
 'http://llvm.org/svn/llvm-project/cfe/trunk'
 :info:extract svn: E120108: Error running context: The server unexpectedly
 closed the connection.
 :info:extract Command failed: cd
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.7/clang-3.7/work/trunk/tools
 && svn co -r 235803 http://llvm.org/svn/llvm-project/cfe/trunk clang
 :info:extract Exit code: 1
 :error:extract org.macports.extract for port clang-3.7 returned: command
 execution failed
 }}}

 The fetch phase worked because base is using arguments for `svn` to tell
 it about the HTTP proxy in the system. This also applies to other subports
 of llvm-3.7 with specific variants.

 See attached patch for a proposed workaround.

-- 
Ticket URL: <https://trac.macports.org/ticket/47648>
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