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arm64e-apple-* target are producing "arm64e.old" objects, per Xcode's ld #80200
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@llvm/issue-subscribers-backend-aarch64 Author: Mike Hommey (glandium)
```
% echo "int main() { return 0; }" > foo.c
% ./clang -o foo.o -c foo.c --target=arm64e-apple-darwin
% ./clang -o foo foo.o --target=arm64e-apple-darwin -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
-macosx_version_min has been renamed to -macos_version_min
ld: warning: ignoring file 'foo.o': found architecture 'arm64e.old', required architecture 'arm64e'
ld: Undefined symbols:
_main, referenced from:
<initial-undefines>
clang: error: linker command failed with exit code 1 (use -v to see invocation)
% otool -h foo.o
|
Indeed, that 0x80 is |
FWIW, this works using the fork over at https://github.com/apple/llvm-project: % ~/src/apple-llvm-project/build/bin/clang -o foo.o -c foo.c --target=arm64e-apple-darwin -S -o - | rg ptrauth
.ptrauth_abi_version 0
% ~/src/apple-llvm-project/build/bin/clang -o foo.o -c foo.c --target=arm64e-apple-darwin
% ~/src/apple-llvm-project/build/bin/clang -o foo foo.o --target=arm64e-apple-darwin -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk Diffing this against the upstream llvm tree finds a bunch of ptrauth code. The rust issue mentioned above links to the initial RFC for this from 2019, and the swiftlang#14 "preview". If someone had to create arm64e binaries for some reason, it's probably possible (but fiddly) to locally patch the ptrauth bits from the fork over there onto public upstream llvm. |
Is there any plan to merge those changes into the main branch of LLVM? As it stands now, the arm64e codegen is effectively broken with recent versions of Xcode |
It looks to me like swiftlang#8946 includes the latest available changes for arm64e. |
I suppose the 0x80 caps is what indicates what Xcode clang produces is what ld calls "arm64e" vs. 0x00 indicating "arm64e.old".
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