new xcode build system and build failures

[Ken Cunningham]

Xcode 9 introduced a new build system behind the scenes, but it was not the default, so most of us building OSS didn't really notice.

<https://medium.com/xcblog/xcode-new-build-system-for-speedy-swift-builds-c39ea6596e17>


Xcode10 has made it the default, and now a number of errors are showing up building ports that previously would build without trouble (aquaterm, macvim, irrlicht, and probably many ports using xcodebuild once they hit the buildbot).

Actively maintained projects will no doubt soon fix the issues with the new build system. Older projects not so much perhaps, and also updating the xcode projects with current versions of Xcode may well make them incompatible with older systems.

To force Xcode10 to use the old build system (as it did before) add this flag to the xcodebuild args. Some ports need this in both the build and destroot args (aquaterm), others pass it in a different way (macvim). 

UseNewBuildSystem=NO

Naturally if you know how to make the xcode project compatible with the new build system and you want to fix it and pass it on upstream, feel free.

No doubt at some point the old xcode build system will be removed from Xcode, and then we'll have to see how the dust has settled.

As an aside, if you're looking for a way to convert older xcode projects to cmake, the "mulle-xcode-to-cmake" does a pretty good job of the first 90% of this conversion.

Ken
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