commit 23985c6a64222df46cd7e21b9b21c0e37aa95e10
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Aug 28 10:32:34 2019 -0700
committer Benjamin Peterson <benjamin@python.org> Wed Aug 28 10:32:34 2019 -0700
tree 46ccf4da0bf12d17754d0ef9d557127ae12472eb
parent 2cb82d2a88710b0af10b9d9721a9710ecc037e72

closes bpo-37965: Fix compiler warning of distutils CCompiler.test_function. (GH-15561)

https://bugs.python.org/issue37965

https://bugs.python.org/issue37965

Automerge-Triggered-By: @benjaminp
(cherry picked from commit 55aabee07501e1468082b3237620e4ecd75c5da6)

Co-authored-by: Anonymous Maarten <madebr@users.noreply.github.com>

Lib/distutils/ccompiler.py

diff --git a/Lib/distutils/ccompiler.py b/Lib/distutils/ccompiler.py
index 1a411ed..4cfc6c7 100644
--- a/Lib/distutils/ccompiler.py
+++ b/Lib/distutils/ccompiler.py
@@ -781,8 +781,9 @@
             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

diff --git a/Misc/NEWS.d/next/Library/2019-08-28-14-04-18.bpo-37965.7xGE-C.rst b/Misc/NEWS.d/next/Library/2019-08-28-14-04-18.bpo-37965.7xGE-C.rst
new file mode 100644
index 0000000..116a9e4
--- /dev/null
+++ b/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.