[MacPorts] #21845: clang should be invoked as 'clang -std=gnu89'

[MacPorts]

#21845: clang should be invoked as 'clang -std=gnu89'
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 Reporter:  paul.vernaza@…          |       Owner:  macports-tickets@…                   
     Type:  defect                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  base                    |     Version:  1.8.1                                
 Keywords:  clang compiler          |        Port:                                       
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 It appears that when one sets 'configure.compiler=clang', the compiler is
 invoked as 'clang', whereas it should probably be invoked as 'clang
 -std=gnu89' in order to maximize compatibility with GCC.  Otherwise, clang
 compiles in C99 mode, which is subtly different than the C89 mode to which
 GCC defaults.

 I have observed this to cause compilation failures with certain packages
 when using 'configure.compiler=clang'.  Off the top of my head, teTeX is
 one, though I don't currently have logs available.  They can be provided
 if necessary.

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Ticket URL: <http://trac.macports.org/ticket/21845>
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