[MacPorts] #24112: Add clang, checker and lto to llvm

[MacPorts]

#24112: Add clang, checker and lto to llvm
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 Reporter:  macports@…              |       Owner:  macports-tickets@…                   
     Type:  enhancement             |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.8.2                                
 Keywords:  llvm lto clang checker  |        Port:  llvm                                 
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 The attached patches add a macports-clang option to portconfigure.tcl and
 introduce [http://clang.llvm.org/ clang], [http://clang-analyzer.llvm.org/
 checker], and lto as variants to llvm.

 The lto variant is a workaround for missing link time optimization support
 in odcctools. This workaround enables -flto and -O4 in clang and in the
 llvm-gcc42 port on darwin9 and darwin10. See #19679 and #23580 for a
 discussion of this issue.

 I'd continue to maintain this port.

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Ticket URL: <http://trac.macports.org/ticket/24112>
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