gh-90005-ffi: Fix building _ctypes without pkg-config (GH-94451)

tiran · web-flow · commit d6acdc1b60de · 2022-07-01T09:23:41.000+02:00
The fallback path did not set LIBFFI_LIBS variable to link with ``-lffi``.
diff --git a/Misc/NEWS.d/next/Build/2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst b/Misc/NEWS.d/next/Build/2022-06-30-17-00-54.gh-issue-90005.iiq5qD.rst
@@ -0,0 +1 @@
+Fix building ``_ctypes`` extension without ``pkg-config``.
diff --git a/configure b/configure
diff --git a/configure.ac b/configure.ac
@@ -3605,7 +3605,10 @@ AS_VAR_IF([with_system_ffi], [yes], [
   PKG_CHECK_MODULES([LIBFFI], [libffi], [have_libffi=yes], [
     AC_CHECK_HEADER([ffi.h], [
       WITH_SAVE_ENV([
-        AC_CHECK_LIB([ffi], [ffi_call], [have_libffi=yes], [have_libffi=no])
+        AC_CHECK_LIB([ffi], [ffi_call], [
+          have_libffi=yes
+          LIBFFI_LIBS="-lffi"
+        ], [have_libffi=no])
       ])
     ])
   ])

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fix building ``_ctypes`` extension without ``pkg-config``.