RFC: base compiler preferences

[Joshua Root]

On 2014-3-24 06:18 , Jeremy Huddleston Sequoia wrote:
> I'm considering adjusting compiler preferences in base trunk for Xcode >= 3.2 as follows:
>   1) Add macports-clang-3.4 before macports-clang-3.3
>   2) Prefer macports-clang-* over other port-provided compilers
> 
> So in general, we prefer Xcode-provided compilers and then fall back on port-provided compilers in the order of clang, llvm-gcc-4.2, gcc-4.2.
> 
> Ports that don't work with any clang are blacklisting *clang*, so they'll skip the promoted macports-clang-* versions and still fall back on macports-llvm-gcc-4.2.
> 
> Thoughts?
> 
> Index: portconfigure.tcl
> ===================================================================
> --- portconfigure.tcl	(revision 118094)
> +++ portconfigure.tcl	(working copy)
> @@ -431,16 +431,16 @@
>      } elseif {$xcodeversion eq "none" || $xcodeversion eq ""} {
>          return {cc}
>      } elseif {[vercmp $xcodeversion 5.0] >= 0} {
> -        return {clang macports-llvm-gcc-4.2 apple-gcc-4.2 macports-clang-3.3}
> +        return {clang macports-clang-3.4 macports-clang-3.3 macports-llvm-gcc-4.2 apple-gcc-4.2}
>      } elseif {[vercmp $xcodeversion 4.3] >= 0} {
> -        return {clang llvm-gcc-4.2 apple-gcc-4.2 macports-clang-3.3}
> +        return {clang llvm-gcc-4.2 macports-clang-3.4 macports-clang-3.3 apple-gcc-4.2}
>      } elseif {[vercmp $xcodeversion 4.0] >= 0} {
> -        return {llvm-gcc-4.2 clang gcc-4.2 macports-clang-3.3 apple-gcc-4.2}
> +        return {llvm-gcc-4.2 clang gcc-4.2 macports-clang-3.4 macports-clang-3.3 apple-gcc-4.2}
>      } elseif {[vercmp $xcodeversion 3.2] >= 0} {
>          if {[string match *10.4u* ${configure.sdkroot}]} {
>              return {gcc-4.0}
>          } else {
> -            return {gcc-4.2 clang llvm-gcc-4.2 macports-clang-3.3 macports-llvm-gcc-4.2 apple-gcc-4.2 gcc-4.0}
> +            return {gcc-4.2 clang llvm-gcc-4.2 macports-clang-3.4 macports-clang-3.3 macports-llvm-gcc-4.2 apple-gcc-4.2 gcc-4.0}
>          }
>      } elseif {[vercmp $xcodeversion 3.0] >= 0} {
>          return {gcc-4.2 apple-gcc-4.2 gcc-4.0 macports-clang-3.3}

The patch looks reasonable, assuming clang-3.4 builds on 10.6. I notice
there currently isn't an archive available.

- Josh