On 2011-7-6 03:05 , Ryan Schmidt wrote:
> On Jul 4, 2011, at 22:56, [email protected] wrote:
> 
>> Revision: 80130
>>          http://trac.macports.org/changeset/80130
>> Author:   [email protected]
>> Date:     2011-07-04 20:56:34 -0700 (Mon, 04 Jul 2011)
>> Log Message:
>> -----------
>> merge r80088 from trunk:
>> choose default configure.compiler based on Xcode version (#30009)
> 
> 
>> +    global xcodeversion macosx_deployment_target
>> +    if {$xcodeversion == "none" || $xcodeversion == ""} {
>> +        return gcc
>> +    } elseif {[rpm-vercomp $xcodeversion 4.0] >= 0} {
>> +        return llvm-gcc-4.2
>> +    } elseif {[rpm-vercomp $xcodeversion 3.2] >= 0 && 
>> $macosx_deployment_target != "10.4"} {
>> +        return gcc-4.2
>> +    } else {
>> +        return gcc-4.0
> 
> The "heads-up" here is going to be that if a port is going to use libtool, 
> then libtool must be built using the same compiler being used to build the 
> current port. (Otherwise you get the dreaded "unable to infer tagged 
> configuration" error; search the issue tracker for many previous occurrences 
> back when we switched the compiler from "gcc" to a specific gcc.) So, for 
> example, users who have already had Xcode 4 on Snow Leopard will have a 
> libtool built using gcc-4.2. Once they upgrade to MacPorts 2.0.0 they'll be 
> using llvm-gcc-4.2, and anything they try to build using libtool will fail, 
> until they rebuild libtool with llvm-gcc-4.2.
> 
> To avoid such problems we could increase the revision of libtool after 
> MacPorts 2.0.0 is released, to force a rebuild. But to ensure that users 
> upgrade to MacPorts 2.0.0 first, the port would need to basically require 
> MacPorts 2.0.0, and I'm not sure how to detect the MacPorts version from 
> within a Portfile.

So wait, does that mean that libtool can't be used by ports that have to
change configure.compiler for whatever reason?

- Josh
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