Eric Miotto 9175dd9cbc
[CMake] Detect properly new linker introduced in Xcode 15 (#77806)
As explained in [1], this linker is functionally equivalent to the
classic one (`ld64`) for build system purposes -- in particular to 
enable the use of order files to link `clang`. For this reason, in 
addition to fixing the detection rename `LLVM_LINKER_IS_LD64` to 
`LLVM_LINKER_IS_APPLE` to make the result of such detection more 
clear -- this should not cause any issue to downstream users, from 
a quick search in SourceGraph [2], only Swift uses the value of
this variable (which I will take care of updating in due time).

[1]: https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes#Linking
[2]: https://sourcegraph.com/search?q=context:global+LLVM_LINKER_IS_LD64+lang:cmake+fork:no+-file:AddLLVM.cmake+-file:clang/tools/driver/CMakeLists.txt&patternType=standard&sm=1&groupBy=repo
rdar://120740222
2024-01-19 16:32:32 -05:00
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