[Python-checkins] bpo-44394: Ensure libexpat is linked against libm (GH-28617)

[pablogsal]

https://github.com/python/cpython/commit/6c1154b9de29e1c9cd3d05f5289543e5cff73895
commit: 6c1154b9de29e1c9cd3d05f5289543e5cff73895
branch: main
author: Pablo Galindo Salgado <Pablogsal at gmail.com>
committer: pablogsal <Pablogsal at gmail.com>
date: 2021-09-29T14:18:33+01:00
summary:

bpo-44394: Ensure libexpat is linked against libm (GH-28617)

files:
M setup.py

diff --git a/setup.py b/setup.py
index 9e411cb35e00b..9e71a223c0aab 100644
--- a/setup.py
+++ b/setup.py
@@ -1767,7 +1767,9 @@ def detect_expat_elementtree(self):
                 ('XML_POOR_ENTROPY', '1'),
             ]
             extra_compile_args = []
-            expat_lib = []
+            # bpo-44394: libexpact 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']