Yes, declaring a dependency does make MacPorts ensure that that dependency is 
active; MacPorts wouldn't work very well if it didn't do that.

On Jan 25, 2013, at 08:41, Jeremy Lavergne wrote:

> Does this ensure that macports-clang-3.1 is active? I have this itching 
> feeling it doesn't.
> 
> On Jan 25, 2013, at 9:36 AM, [email protected] wrote:
> 
>> +#Forces use of clang compiler (does not build with gcc)
>> +if {${configure.compiler} != "clang" && ${os.platform} == "darwin"} {
>> +    depends_build-append    port:clang-3.1
>> +    configure.compiler      macports-clang-3.1
>> +}

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