https://github.com/python/cpython/commit/2b0c684e0759dc3fec0e9dd0fc8383e6c75b7b5c
commit: 2b0c684e0759dc3fec0e9dd0fc8383e6c75b7b5c
branch: main
author: Zanie Blue <[email protected]>
committer: brandtbucher <[email protected]>
date: 2025-06-12T16:11:08-07:00
summary:
GH-134273: Allow setting JIT compiler flags at build time with CFLAGS_JIT
(GH134276)
files:
A Misc/NEWS.d/next/Build/2025-05-19-18-09-20.gh-issue-134273.ZAliyy.rst
M Tools/jit/_targets.py
M Tools/jit/build.py
M configure
M configure.ac
diff --git
a/Misc/NEWS.d/next/Build/2025-05-19-18-09-20.gh-issue-134273.ZAliyy.rst
b/Misc/NEWS.d/next/Build/2025-05-19-18-09-20.gh-issue-134273.ZAliyy.rst
new file mode 100644
index 00000000000000..3eb13cefbe6dfc
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-05-19-18-09-20.gh-issue-134273.ZAliyy.rst
@@ -0,0 +1 @@
+Add support for configuring compiler flags for the JIT with ``CFLAGS_JIT``
diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py
index d0a1c081ffecc2..b383e39da19456 100644
--- a/Tools/jit/_targets.py
+++ b/Tools/jit/_targets.py
@@ -10,6 +10,7 @@
import sys
import tempfile
import typing
+import shlex
import _llvm
import _schema
@@ -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()
@@ -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())
@@ -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)
diff --git a/Tools/jit/build.py b/Tools/jit/build.py
index 1afd0c76bad1d2..a0733005929bf2 100644
--- a/Tools/jit/build.py
+++ b/Tools/jit/build.py
@@ -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,
diff --git a/configure b/configure
index 029bf527da4e3d..fef9f2d7da935c 100755
--- a/configure
+++ b/configure
@@ -10863,7 +10863,7 @@ then :
else case e in #(
e) as_fn_append CFLAGS_NODIST " $jit_flags"
- REGEN_JIT_COMMAND="\$(PYTHON_FOR_REGEN)
\$(srcdir)/Tools/jit/build.py ${ARCH_TRIPLES:-$host} --output-dir .
--pyconfig-dir ."
+ REGEN_JIT_COMMAND="\$(PYTHON_FOR_REGEN)
\$(srcdir)/Tools/jit/build.py ${ARCH_TRIPLES:-$host} --output-dir .
--pyconfig-dir . --cflags=\"$CFLAGS_JIT\""
JIT_STENCILS_H="jit_stencils.h"
if test "x$Py_DEBUG" = xtrue
then :
diff --git a/configure.ac b/configure.ac
index 371b2e8ed73525..cc37a636c522ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -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],
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