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[3.13] gh-131032: Add support.linked_to_musl() function (#131071) #131179

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Merged
merged 1 commit into from
Mar 13, 2025
Merged

[3.13] gh-131032: Add support.linked_to_musl() function (#131071) #131179

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19 changes: 19 additions & 0 deletions Lib/test/support/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2767,3 +2767,22 @@ def __iter__(self):
if self.iter_raises:
1/0
return self


def linked_to_musl():
"""
Test if the Python executable is linked to the musl C library.
"""
if sys.platform != 'linux':
return False

import subprocess
exe = getattr(sys, '_base_executable', sys.executable)
cmd = ['ldd', exe]
try:
stdout = subprocess.check_output(cmd,
text=True,
stderr=subprocess.STDOUT)
except (OSError, subprocess.CalledProcessError):
return False
return ('musl' in stdout)
5 changes: 3 additions & 2 deletions Lib/test/test_math.py
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Expand Up @@ -2712,8 +2712,9 @@ def test_fma_infinities(self):
# gh-73468: On some platforms, libc fma() doesn't implement IEE 754-2008
# properly: it doesn't use the right sign when the result is zero.
@unittest.skipIf(
sys.platform.startswith(("freebsd", "wasi", "netbsd"))
or (sys.platform == "android" and platform.machine() == "x86_64"),
sys.platform.startswith(("freebsd", "wasi", "netbsd", "emscripten"))
or (sys.platform == "android" and platform.machine() == "x86_64")
or support.linked_to_musl(), # gh-131032
f"this platform doesn't implement IEE 754-2008 properly")
def test_fma_zero_result(self):
nonnegative_finites = [0.0, 1e-300, 2.3, 1e300]
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4 changes: 4 additions & 0 deletions Lib/test/test_support.py
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Expand Up @@ -733,6 +733,10 @@ def test_copy_python_src_ignore(self):
self.assertEqual(support.copy_python_src_ignore(path, os.listdir(path)),
ignored)

def test_linked_to_musl(self):
linked = support.linked_to_musl()
self.assertIsInstance(linked, bool)

# XXX -follows a list of untested API
# make_legacy_pyc
# is_resource_enabled
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