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gh-134273: Allow setting JIT compiler flags withCFLAGS_JIT#134276

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Merged
brandtbucher merged 12 commits intopython:mainfromzanieb:zb/cflags-jit
Jun 12, 2025
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
Add support for configuring compiler flags for the JIT with ``CFLAGS_JIT``
5 changes: 5 additions & 0 deletionsTools/jit/_targets.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -10,6 +10,7 @@
import sys
import tempfile
import typing
import shlex

import _llvm
import _schema
Expand DownExpand Up@@ -46,6 +47,7 @@ class _Target(typing.Generic[_S, _R]):
stable: bool = False
debug: bool = False
verbose: bool = False
cflags: str = ""
known_symbols: dict[str, int] = dataclasses.field(default_factory=dict)
pyconfig_dir: pathlib.Path = pathlib.Path.cwd().resolve()

Expand All@@ -62,6 +64,7 @@ def _compute_digest(self) -> str:
hasher = hashlib.sha256()
hasher.update(self.triple.encode())
hasher.update(self.debug.to_bytes())
hasher.update(self.cflags.encode())
# These dependencies are also reflected in _JITSources in regen.targets:
hasher.update(PYTHON_EXECUTOR_CASES_C_H.read_bytes())
hasher.update((self.pyconfig_dir / "pyconfig.h").read_bytes())
Expand DownExpand Up@@ -155,6 +158,8 @@ async def _compile(
f"{o}",
f"{c}",
*self.args,
# Allow user-provided CFLAGS to override any defaults
*shlex.split(self.cflags),
]
await _llvm.run("clang", args, echo=self.verbose)
return await self._parse(o)
Expand Down
4 changes: 4 additions & 0 deletionsTools/jit/build.py
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Expand Up@@ -39,11 +39,15 @@
parser.add_argument(
"-v", "--verbose", action="store_true", help="echo commands as they are run"
)
parser.add_argument(
"--cflags", help="additional flags to pass to the compiler", default=""
)
args = parser.parse_args()
for target in args.target:
target.debug = args.debug
target.force = args.force
target.verbose = args.verbose
target.cflags = args.cflags
target.pyconfig_dir = args.pyconfig_dir
target.build(
comment=comment,
Expand Down
2 changes: 1 addition & 1 deletionconfigure
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2 changes: 1 addition & 1 deletionconfigure.ac
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Expand Up@@ -2776,7 +2776,7 @@ AS_VAR_IF([jit_flags],
[],
[AS_VAR_APPEND([CFLAGS_NODIST], [" $jit_flags"])
AS_VAR_SET([REGEN_JIT_COMMAND],
["\$(PYTHON_FOR_REGEN) \$(srcdir)/Tools/jit/build.py ${ARCH_TRIPLES:-$host} --output-dir . --pyconfig-dir ."])
["\$(PYTHON_FOR_REGEN) \$(srcdir)/Tools/jit/build.py ${ARCH_TRIPLES:-$host} --output-dir . --pyconfig-dir . --cflags=\"$CFLAGS_JIT\""])
AS_VAR_SET([JIT_STENCILS_H], ["jit_stencils.h"])
AS_VAR_IF([Py_DEBUG],
[true],
Expand Down
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