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gh-144533: Use pybuilddir.txt to find _sysconfigdata for WASI #144535

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gh-144533: Use pybuilddir.txt to find _sysconfigdata for WASI #144535

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1 change: 1 addition & 0 deletions 1 Misc/NEWS.d/next/Build/2026-02-06-13-49-09.gh-issue-144533.1k4jaE.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Use ``pybuilddir.txt`` to find ``_sysconfigdata`` for the WASI build script.
27 changes: 17 additions & 10 deletions 27 Platforms/WASI/__main__.py
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Expand Up @@ -317,16 +317,23 @@ def configure_wasi_python(context, working_dir):

wasi_build_dir = working_dir.relative_to(CHECKOUT)

python_build_dir = BUILD_DIR / "build"
lib_dirs = list(python_build_dir.glob("lib.*"))
assert len(lib_dirs) == 1, (
f"Expected a single lib.* directory in {python_build_dir}"
)
lib_dir = os.fsdecode(lib_dirs[0])
python_version = lib_dir.rpartition("-")[-1]
sysconfig_data_dir = (
f"{wasi_build_dir}/build/lib.wasi-wasm32-{python_version}"
)
pybuilddir = working_dir / "pybuilddir.txt"
if pybuilddir.is_file():
with pybuilddir.open("r", encoding="utf-8") as f:
sysconfig_data_dir = f"{wasi_build_dir}/{f.read().strip()}"
else:
# Fallback if the build hasn't generated the file yet.
python_build_dir = BUILD_DIR / "build"
lib_dirs = list(python_build_dir.glob("lib.*"))
assert len(lib_dirs) == 1, (
f"Expected a single lib.* directory in {python_build_dir}"
)
lib_dir = os.fsdecode(lib_dirs[0])
python_version = lib_dir.rpartition("-")[-1]

sysconfig_data_dir = (
f"{wasi_build_dir}/build/lib.wasi-wasm32-{python_version}"
)

# Use PYTHONPATH to include sysconfig data which must be anchored to the
# WASI guest's `/` directory.
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