From: Victor Stinner <vstinner@redhat.com>
Date: Mon, 3 Dec 2018 15:49:24 +0000 (+0100)
Subject: bpo-26544: Make platform.libc_ver() less slow (GH-10868)
X-Git-Tag: v2.7.16rc1~59
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8687bd86e6f138ef0699a1e9f3f9555765949b51;p=thirdparty%2FPython%2Fcpython.git

bpo-26544: Make platform.libc_ver() less slow (GH-10868)

Coarse benchmark on Fedora 29: 1.6 sec => 0.1 sec.

Co-Authored-By: Antoine Pitrou <solipsis@pitrou.net>

(cherry-picked from commit ba7c226095703f63c78b00e56f1db8d99ac3a54a)
---

diff --git a/Lib/platform.py b/Lib/platform.py
index 62a5476a8f4d..e04d87f258a7 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -194,7 +194,10 @@ def libc_ver(executable=sys.executable,lib='',version='', chunksize=2048):
         binary = f.read(chunksize)
         pos = 0
         while pos < len(binary):
-            m = _libc_search.search(binary,pos)
+            if 'libc' in binary or 'GLIBC' in binary:
+                m = _libc_search.search(binary, pos)
+            else:
+                m = None
             if not m or m.end() == len(binary):
                 chunk = f.read(chunksize)
                 if chunk: