Updated swi-prolog portfile for version 5.10.5

[pmoura (Paulo Moura)]

Updated swi-prolog portfile for version 5.10.5.

[ryandesign (Ryan Carsten Schmidt)]

Why did you add the block:

platform darwin 11 { 
        configure.compiler gcc-4.2 
} 

In MacPorts 2, compilers are chosen based on Xcode version, not OS version. For example, Xcode 3.1/3.2 uses gcc-4.2, Xcode 4.0/4.1 uses llvm-gcc-4.2, and Xcode 4.2 uses clang.

Item 3 of the ​MacPorts on Lion (common issues, fixes, and workarounds) post shows how you should coerce the use of gcc-4.2 instead of these other compilers -- if indeed that is the only way this port will work. If this port can be made to work with clang instead of llvm-gcc-4.2, that is preferable.

[pmoura (Paulo Moura)]

SWI-Prolog will not work with llvm-gcc-4.2 and Xcode 4.2 is not yet publicly available. SWI-Prolog developer have given up (for the moment) in trying to find a fix for llvm-gcc-4.2 (he is not a MacOS X user and is access to Lion machines is limited). I will try to look into using clang instead when Xcode 4.2 gets released.

[ryandesign (Ryan Carsten Schmidt)]

Updated to 5.10.5 in r82802, using the verbiage from ​MacPorts on Lion (common issues, fixes, and workarounds) to force the use of gcc-4.2. If you test clang in the future and find it works, please switch to using that instead.