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Nikita Popov
0670491950
LLVM does not support host feature detection (only host cpu detection) on apple platforms. As such, the returned feature string will be empty. Adding this empty string to the target-features attribute results in a verifier error on LLVM 22. Fix this by not adding the empty string to the target features. The reason why this was not caught by the target-cpu-native test is that it requires a function that adds *some* target features, otherwise the attribute is omitted entirely. We achieve this with a somewhat peculiar construction that enables `neon` if it's already enabled. (This is to avoid enabling it on softfloat targets.)
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.