Allow Clang-19+ for JIT (currently hard requires clang-19) #145800
Description
Feature or enhancement
Proposal:
Current --enable-experimental-jit hard requires Clang-19 for Python 3.14.3:
026-03-11T10:25:48.1119897Z #14 62.49
2026-03-11T10:25:48.1121059Z #14 62.49 ==========================================================
2026-03-11T10:25:48.1121976Z #14 62.49 JIT support for x86_64-pc-linux-gnu is still experimental!
2026-03-11T10:25:48.1123021Z #14 62.49 Please report any issues you encounter.
2026-03-11T10:25:48.1123777Z #14 62.49 ==========================================================
2026-03-11T10:25:48.1124585Z #14 62.49
2026-03-11T10:25:48.3356185Z #14 62.51 clang-21 -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall -march=native -O3 -flto -pipe -march=native -O3 -flto -pipe -fno-semantic-interposition -flto=full -g -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden -D_Py_TIER2=1 -D_Py_JIT -fprofile-instr-generate -I./Include/internal -I./Include/internal/mimalloc -I. -I./Include -DPy_BUILD_CORE -o Python/optimizer.o Python/optimizer.c
2026-03-11T10:25:48.3361374Z #14 62.51 + Exception Group Traceback (most recent call last):
2026-03-11T10:25:48.3362072Z #14 62.51 | File "/python-build/./Tools/jit/build.py", line 52, in <module>
2026-03-11T10:25:48.3362583Z #14 62.51 | target.build(
2026-03-11T10:25:48.3363110Z #14 62.51 | ~~~~~~~~~~~~^
2026-03-11T10:25:48.3363441Z #14 62.51 | comment=comment,
2026-03-11T10:25:48.3363783Z #14 62.51 | ^^^^^^^^^^^^^^^^
2026-03-11T10:25:48.3364114Z #14 62.51 | force=args.force,
2026-03-11T10:25:48.3364442Z #14 62.51 | ^^^^^^^^^^^^^^^^^
2026-03-11T10:25:48.3364943Z #14 62.51 | jit_stencils=args.output_dir / f"jit_stencils-{target.triple}.h",
2026-03-11T10:25:48.3365568Z #14 62.51 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-03-11T10:25:48.3365982Z #14 62.51 | )
2026-03-11T10:25:48.3366230Z #14 62.51 | ^
2026-03-11T10:25:48.3366623Z #14 62.51 | File "/python-build/Tools/jit/_targets.py", line 224, in build
2026-03-11T10:25:48.3367263Z #14 62.51 | stencil_groups = ASYNCIO_RUNNER.run(self._build_stencils())
2026-03-11T10:25:48.3367773Z #14 62.51 | File "/usr/local/lib/python3.14/asyncio/runners.py", line 127, in run
2026-03-11T10:25:48.3368173Z #14 62.51 | return self._loop.run_until_complete(task)
2026-03-11T10:25:48.3368482Z #14 62.51 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
2026-03-11T10:25:48.3369264Z #14 62.51 | File "/usr/local/lib/python3.14/asyncio/base_events.py", line 719, in run_until_complete
2026-03-11T10:25:48.3369718Z #14 62.51 | return future.result()
2026-03-11T10:25:48.3369963Z #14 62.51 | ~~~~~~~~~~~~~^^
2026-03-11T10:25:48.3370321Z #14 62.51 | File "/python-build/Tools/jit/_targets.py", line 180, in _build_stencils
2026-03-11T10:25:48.3370740Z #14 62.51 | async with asyncio.TaskGroup() as group:
2026-03-11T10:25:48.3371041Z #14 62.51 | ~~~~~~~~~~~~~~~~~^^
2026-03-11T10:25:48.3371426Z #14 62.51 | File "/usr/local/lib/python3.14/asyncio/taskgroups.py", line 72, in __aexit__
2026-03-11T10:25:48.3371858Z #14 62.51 | return await self._aexit(et, exc)
2026-03-11T10:25:48.3372140Z #14 62.51 | ^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-03-11T10:25:48.3372527Z #14 62.51 | File "/usr/local/lib/python3.14/asyncio/taskgroups.py", line 174, in _aexit
2026-03-11T10:25:48.3373055Z #14 62.51 | raise BaseExceptionGroup(
2026-03-11T10:25:48.3373323Z #14 62.51 | ...<2 lines>...
2026-03-11T10:25:48.3373537Z #14 62.51 | ) from None
2026-03-11T10:25:48.3373872Z #14 62.51 | ExceptionGroup: unhandled errors in a TaskGroup (286 sub-exceptions)
2026-03-11T10:25:48.3374255Z #14 62.51 +-+---------------- 1 ----------------
2026-03-11T10:25:48.3374539Z #14 62.51 | Traceback (most recent call last):
2026-03-11T10:25:48.3374903Z #14 62.51 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3375460Z #14 62.51 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3375858Z #14 62.51 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3376283Z #14 62.51 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3376639Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3376931Z #14 62.52 +---------------- 2 ----------------
2026-03-11T10:25:48.3377210Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3377566Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3377982Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3378363Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3378769Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3379125Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3379397Z #14 62.52 +---------------- 3 ----------------
2026-03-11T10:25:48.3379673Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3380028Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3380426Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3380804Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3381197Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3381538Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3381812Z #14 62.52 +---------------- 4 ----------------
2026-03-11T10:25:48.3382078Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3382435Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3382957Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3383324Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3383715Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3384058Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3384327Z #14 62.52 +---------------- 5 ----------------
2026-03-11T10:25:48.3384599Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3385070Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3385465Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3385831Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3386212Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3386562Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3386839Z #14 62.52 +---------------- 6 ----------------
2026-03-11T10:25:48.3387105Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3387455Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3387851Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3388212Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3388604Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3388948Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3389223Z #14 62.52 +---------------- 7 ----------------
2026-03-11T10:25:48.3389493Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3389835Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3390235Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3390722Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3391113Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3391463Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3391738Z #14 62.52 +---------------- 8 ----------------
2026-03-11T10:25:48.3392002Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3392352Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3392852Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3393227Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3393620Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3393960Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3394231Z #14 62.52 +---------------- 9 ----------------
2026-03-11T10:25:48.3394504Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3394852Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3395251Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3395613Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3396006Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3396354Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3396626Z #14 62.52 +---------------- 10 ----------------
2026-03-11T10:25:48.3396908Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3397262Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3397659Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3398031Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3398428Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3398766Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3399043Z #14 62.52 +---------------- 11 ----------------
2026-03-11T10:25:48.3399315Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3399671Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3400189Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3400553Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3400948Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3401292Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3401562Z #14 62.52 +---------------- 12 ----------------
2026-03-11T10:25:48.3401846Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3402209Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3402613Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3403098Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3403491Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3403838Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3404121Z #14 62.52 +---------------- 13 ----------------
2026-03-11T10:25:48.3404389Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3404745Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3405141Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3405506Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3406009Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3406373Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3406773Z #14 62.52 +---------------- 14 ----------------
2026-03-11T10:25:48.3407041Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3407395Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3407791Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3408160Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3408555Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3408897Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3409173Z #14 62.52 +---------------- 15 ----------------
2026-03-11T10:25:48.3409446Z #14 62.52 | Traceback (most recent call last):
2026-03-11T10:25:48.3409800Z #14 62.52 | File "/python-build/Tools/jit/_targets.py", line 167, in _compile
2026-03-11T10:25:48.3410196Z #14 62.52 | await _llvm.run("clang", args, echo=self.verbose)
2026-03-11T10:25:48.3410563Z #14 62.52 | File "/python-build/Tools/jit/_llvm.py", line 107, in run
2026-03-11T10:25:48.3410951Z #14 62.52 | raise RuntimeError(f"Can't find {tool}-{_LLVM_VERSION}!")
2026-03-11T10:25:48.3411296Z #14 62.52 | RuntimeError: Can't find clang-19!
2026-03-11T10:25:48.3411873Z #14 62.52 +---------------- ... ----------------
2026-03-11T10:25:48.3412272Z #14 62.52 | and 271 more exceptions
2026-03-11T10:25:48.3412663Z #14 62.52 +------------------------------------
I have Clang-21 installed.
Has this already been discussed elsewhere?
No response given
Links to previous discussion of this feature:
No response