From 412ae8ab10734b72384c969181919cc4eb154406 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Wed, 29 Sep 2021 07:13:41 -0700
Subject: [3.10] bpo-44394: Ensure libexpat is linked against libm (GH-28617)
 (GH-28621)
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* bpo-44394: Ensure libexpat is linked against libm (GH-28617)
(cherry picked from commit 6c1154b9de29e1c9cd3d05f5289543e5cff73895)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
---
 setup.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index 3d250e7..a6fcc12 100644
--- a/setup.py
+++ b/setup.py
@@ -1765,7 +1765,9 @@ class PyBuildExt(build_ext):
                 ('XML_POOR_ENTROPY', '1'),
             ]
             extra_compile_args = []
-            expat_lib = []
+            # bpo-44394: libexpat uses isnan() of math.h and needs linkage
+            # against the libm
+            expat_lib = ['m']
             expat_sources = ['expat/xmlparse.c',
                              'expat/xmlrole.c',
                              'expat/xmltok.c']
-- 
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