bpo-21536: On Cygwin, C extensions must be linked with libpython (GH-13549)
It is also possible to link against a library or executable with a
statically linked libpython, but not both with the same DLL. In fact
building a statically linked python is currently broken on Cygwin
for other (related) reasons.
The same problem applies to other POSIX-like layers over Windows
(MinGW, MSYS) but Python's build system does not seem to attempt
to support those platforms at the moment.
diff --git a/configure b/configure
index 9f2007f..c76eb7a 100755
--- a/configure
+++ b/configure
@@ -15129,9 +15129,9 @@
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $LDVERSION" >&5
$as_echo "$LDVERSION" >&6; }
-# On Android the shared libraries must be linked with libpython.
+# On Android and Cygwin the shared libraries must be linked with libpython.
-if test -z "$ANDROID_API_LEVEL"; then
+if test -z "$ANDROID_API_LEVEL" -o "$MACHDEP" != "cygwin"; then
LIBPYTHON=''
else
LIBPYTHON="-lpython${VERSION}${ABIFLAGS}"