closes bpo-37965: Fix compiler warning of distutils CCompiler.test_function. (GH-15560)

https://bugs.python.org/issue37965

https://bugs.python.org/issue37965

Automerge-Triggered-By: @benjaminp
(cherry picked from commit 55aabee)

Co-authored-by: Anonymous Maarten <[email protected]>

Author: miss-islington

Lib/distutils/ccompiler.py

@@ -748,8 +748,9 @@ def has_function(self, funcname, includes=None, include_dirs=None,
             for incl in includes:
                 f.write("""#include "%s"\n""" % incl)
             f.write("""\
-main (int argc, char **argv) {
+int main (int argc, char **argv) {
     %s();
+    return 0;
 }
 """ % funcname)
         finally:

Misc/NEWS.d/next/Library/2019-08-28-14-04-18.bpo-37965.7xGE-C.rst

@@ -0,0 +1 @@
+Fix C compiler warning caused by distutils.ccompiler.CCompiler.has_function.