Geoffrey Malcolm Oxberry 7c4c6e72ad vtk@:6.1.0 : disable Obj-C gc for XCode >= 5.1 ... Apple removed support for Objective-C garbage collection in binaries in XCode 5.1, but VTK 6.1.0 and earlier set flags for garbage collection, resulting in a compile-time bug when compiling VTK using any recent version of XCode (i.e., Apple Clang). This commit fixes this bug by removing the garbage collection flags via setting the variable `VTK_REQUIRED_OBJCXX_FLAGS` to the empty string. This variable has the same value (i.e., the empty string) in the root-level CMakeLists.txt file for VTK 6.2.0 and later.		2018-01-19 13:44:36 -08:00
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spack	vtk@:6.1.0 : disable Obj-C gc for XCode >= 5.1	2018-01-19 13:44:36 -08:00