ld64.lld doesn't seem to support arm64e

[glandium]

$ echo "int main() { return 0; }" > foo.c
$ clang --target=arm64e-apple-darwin -o foo foo.c -isysroot /path/to/MacOSX14.2.sdk -fuse-ld=lld
$ file foo
foo: Mach-O 64-bit arm64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>

When using plain ld64:

$ clang --target=arm64e-apple-darwin -o foo foo.c -isysroot /path/to/MacOSX14.2.sdk
$ file foo
foo: Mach-O 64-bit arm64e 00) executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>

[llvmbot]

@llvm/issue-subscribers-lld-macho

Author: Mike Hommey (glandium)

``` $ echo "int main() { return 0; }" > foo.c $ clang --target=arm64e-apple-darwin -o foo foo.c -isysroot /path/to/MacOSX14.2.sdk -fuse-ld=lld $ file foo foo: Mach-O 64-bit arm64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE> ``` When using plain ld64: ``` $ clang --target=arm64e-apple-darwin -o foo foo.c -isysroot /path/to/MacOSX14.2.sdk $ file foo foo: Mach-O 64-bit arm64e 00) executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE> ```

[glandium]

For the record, isArchABICompatible, compatWithTargetArch and createTargetInfo all ignore the cpuSubtype from the target.