[Openmcl-devel] Incompatibility with Xcode 4?

Gary Palter palter at clozure.com
Tue Mar 15 17:40:35 PDT 2011

On Mar 15, 2011, at 8:33 PM, Gary Byers wrote:

> The good news is that XCode 4.0 can't be used to develop applications
> that use 10.7-specific features.  (They don't release headers/documentation
> for unreleased OS versions.)  I have no idea how post-4.0 versions of XCode
> will be distributed (or what OS versions, if any, Apple will decide to drop
> support for)

While Xcode 4.0 doesn't support 10.7 development, you can still specify a minimum target of 10.5.  You just can't use the 10.5 SDK as it's not there.  You have to use the 10.6 SDK and be careful about not calling 10.6 APIs without checking that they're available first.

I think it should be possible to build CCL using Xcode 4 and have it run on 10.5.  I've not tried this myself and I don't have any machines running 10.5 I can use right now.

> If you don't upgrade to XCode 4.1, how will you be able to develop applications
> for iOS 4.3, and if you don't develop such applications how will Apple make any
> money from allowing you to sell them ?  Some people are just so selfish ...
> If you actually need to continue to develop for/support Leopard, Apple recommends
> that you install both XCode 3.x and 4.x in separate directories.  If you can
> predict how the order in which these packages are installed affects which
> versions of the command-line tools (if any) get installed in places like /usr/bin,
> then you know far too much about about how the installation process works.  (At
> some point in a late beta release of XCode 4, the option to install the command-line
> tools at all was disabled by default; I don't know whether or not this was true
> of the final version.)

Only one version of the command line tools (in /usr/bin, etc.) can be installed.  So, it's entirely up to the developer which version they get.  If you've already installed, say Xcode 4, and then install Xcode 3 and say to install the command line tools, they will replace those from Xcode 4.  And, of course, vice-versa.

I believe both Xcode 3 and 4 installers now default to not installing the command line tools to force the developer to decide what to do.

> On Tue, 15 Mar 2011, Tim Bradshaw wrote:
>> On 14 Mar 2011, at 17:10, Raffael Cavallaro wrote:
>>> wow, that seems premature.
>>> Any suggested workaround?
>> XCode 4 is not free as best I can tell - I have a developer login but not a paid one, and it wants me to join some developer program which costs money, so I can download it.  It would be interesting to know whether there will be any no-cost development environment from Apple for 10.7: I suspect there will not be.
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