[cmake-developers] Crash bug in XCode generator (2.8.3, 2.8.4-rc1, master)

[Johan Björk]

Hi everyone,

If you specify a CMAKE_TOOLCHAIN_FILE without setting
CMAKE_OSX_ARCHITECTURES, you get a crash in
cmGlobalXCodeGenerator.cxx:2685.
It was a user-error on my behalf (my toolchain file was only intended
to be used on Makefile generators), but it's nice if we don't crash.

Patch against CMake master  attached.

/Johan
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