MacPorts on Lion (common issues, fixes, and workarounds)

[Ryan Schmidt]

On Jul 20, 2011, at 11:26, Jeremy Huddleston wrote:

> If both clang and llvm-gcc-4.2 fail to build, you can try falling back on gcc-4.2.  If gcc-4.2 works, you can fall back on it, but we recommend you try to fix the problem.  A common reason for both llvm-gcc and clang failing where gcc-4.2 works is buggy inline asm.  If you are unfamiliar with x86 asm, please file a bug with upstream developers and put a reference to it in the Portfile.
> 
> if {${configure.compiler} == "clang" ||
>    ${configure.compiler} == "llvm-gcc-4.2"} {
>    configure.compiler gcc-4.2
>    if {![file executable ${configure.cc}]} {
>        depends_build-append port:apple-gcc42
>        configure.compiler apple-gcc-4.2
>    }
> }

Remind me, what is the purpose for the "if {![file executable ${configure.cc}]}" block? On what systems would /usr/bin/gcc-4.2 not exist? I'm only coming up with Tiger, but nobody would request llvm-gcc-4.2 or clang on Tiger either.