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[3.14] gh-135648: Document that shutil.copyfileobj doesn't flush (GH-135737) (#135873)

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Adds a note about flush/close on copyfileobj, and updates
the Emscripten build script to follow documented advice.
(cherry picked from commit 34393cbdd4)

Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>
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Miss Islington (bot) 2025-06-24 03:22:07 +02:00 • committed by GitHub
parent 7227aa4bfa
commit 148f31f2d8
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2 changed files with 9 additions and 1 deletions
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3
Tools/wasm/emscripten/__main__.py
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@ -167,11 +167,12 @@ def make_build_python(context, working_dir):
@subdir(HOST_BUILD_DIR, clean_ok=True)
def make_emscripten_libffi(context, working_dir):
shutil.rmtree(working_dir / "libffi-3.4.6", ignore_errors=True)
with tempfile.NamedTemporaryFile(suffix=".tar.gz") as tmp_file:
with tempfile.NamedTemporaryFile(suffix=".tar.gz", delete_on_close=False) as tmp_file:
with urlopen(
"https://github.com/libffi/libffi/releases/download/v3.4.6/libffi-3.4.6.tar.gz"
) as response:
shutil.copyfileobj(response, tmp_file)
tmp_file.close()
shutil.unpack_archive(tmp_file.name, working_dir)
call(
[EMSCRIPTEN_DIR / "make_libffi.sh"],