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gh-146475: Block Apple LLVM 21 from passing JIT tool version check #146478

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gh-146475: Block Apple LLVM 21 from passing JIT tool version check #146478

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gh-146475: Block Apple LLVM 21 from passing JIT tool version check
ashutosh314 Mar 26, 2026
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gh-146475: Add NEWS entry
ashutosh314 Mar 26, 2026
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2026-03-26-23-40-21.gh-issue-146475.F9KMLP.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Block Apple LLVM 21 from passing the JIT tool version check, as the JIT is
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savannahostrowski marked this conversation as resolved.
incompatible with it.
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@savannahostrowski savannahostrowski Apr 15, 2026

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Suggested change
Block Apple LLVM 21 from passing the JIT tool version check, as the JIT is
incompatible with it.
Block Apple Clang from being used to build the JIT as it ships without
required LLVM tools.

While the CFI directives are an issue, let's make this fix more about the underlying toolchain incompatibility (i.e. users have to install llvm-readobj still)

2 changes: 1 addition & 1 deletion Tools/jit/_llvm.py
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Expand Up @@ -59,7 +59,7 @@ async def _check_tool_version(
name: str, llvm_version: str, *, echo: bool = False
) -> bool:
output = await _run(name, ["--version"], echo=echo)
_llvm_version_pattern = re.compile(rf"version\s+{llvm_version}\.\d+\.\d+\S*\s+")
_llvm_version_pattern = re.compile(rf"(?<!Apple )LLVM version\s+{llvm_version}\.\d+\.\d+\S*\s+")
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@diegorusso diegorusso Mar 27, 2026

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On my mac I had to add LLVM and clang to match the string. Can you please check?

Suggested change
_llvm_version_pattern = re.compile(rf"(?<!Apple )LLVM version\s+{llvm_version}\.\d+\.\d+\S*\s+")
_llvm_version_pattern = re.compile(rf"(?<!Apple )(LLVM|clang) version\s+{llvm_version}\.\d+\.\d+\S*\s+")

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@diegorusso diegorusso Mar 27, 2026

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$ /Library/Developer/CommandLineTools/usr/bin/llvm-objdump --version
Apple LLVM version 21.0.0
  Optimized build.
...

$ /Library/Developer/CommandLineTools/usr/bin/clang --version
Apple clang version 21.0.0 (clang-2100.0.123.102)
Target: arm64-apple-darwin25.4.0
...

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@savannahostrowski savannahostrowski Apr 3, 2026

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Yep, I'm on MacOS as well and checked that we do need clang in the regex.

return bool(output and _llvm_version_pattern.search(output))


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