From: Hood Chatham <roberthoodchatham@gmail.com>
Date: Sun, 31 Aug 2025 22:50:29 +0000 (+0200)
Subject: gh-138130: Fix return value of libc_ver() on Emscripten (#138132)
X-Git-Tag: v3.15.0a1~557
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=11a5fc82381308f0b6060b8c06af89fd197516e1;p=thirdparty%2FPython%2Fcpython.git

gh-138130: Fix return value of libc_ver() on Emscripten (#138132)

Emscripten's libc is a hybrid of musl and llvm libc; but it reports that it is
"glibc". This modifies the return value of `platform.libc_ver()` to return
something that is Emscripten-specific.
---

diff --git a/Lib/platform.py b/Lib/platform.py
index da15bb4717bb..762f5d06099c 100644
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -173,6 +173,11 @@ def libc_ver(executable=None, lib='', version='', chunksize=16384):
 
     """
     if not executable:
+        if sys.platform == "emscripten":
+            # Emscripten's os.confstr reports that it is glibc, so special case
+            # it.
+            ver = ".".join(str(x) for x in sys._emscripten_info.emscripten_version)
+            return ("emscripten", ver)
         try:
             ver = os.confstr('CS_GNU_LIBC_VERSION')
             # parse 'glibc 2.28' as ('glibc', '2.28')
diff --git a/Lib/test/test_platform.py b/Lib/test/test_platform.py
index 2e26134bae83..73d4f3cbdb68 100644
--- a/Lib/test/test_platform.py
+++ b/Lib/test/test_platform.py
@@ -532,8 +532,10 @@ class PlatformTest(unittest.TestCase):
             self.assertEqual(override.model, "Whiz")
             self.assertTrue(override.is_simulator)
 
-    @unittest.skipIf(support.is_emscripten, "Does not apply to Emscripten")
     def test_libc_ver(self):
+        if support.is_emscripten:
+            assert platform.libc_ver() == ("emscripten", "4.0.12")
+            return
         # check that libc_ver(executable) doesn't raise an exception
         if os.path.isdir(sys.executable) and \
            os.path.exists(sys.executable+'.exe'):