https://git.ruby-lang.org/ruby.git/commit/?id=5917fe2303

From 5917fe2303bc85882b52e60145eb031ee18583c7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 26 May 2020 19:17:47 +0900
Subject: _GNU_SOURCE is needed for mkostemp on Cygwin


diff --git a/ext/fiddle/extlibs b/ext/fiddle/extlibs
index 030621f..85490ea 100644
--- a/ext/fiddle/extlibs
+++ b/ext/fiddle/extlibs
@@ -6,6 +6,7 @@ https://ftp.osuosl.org/pub/blfs/conglomeration/libffi/$(pkg).tar.gz \ https://github.com/ruby/ruby/blob/trunk/ext/fiddle/extlibs#L6
   sha512:980ca30a8d76f963fca722432b1fe5af77d7a4e4d2eac5144fbc5374d4c596609a293440573f4294207e1bdd9fda80ad1e1cafb2ffb543df5a275bc3bd546483 \
   #
 	win32/$(pkg)-mswin.patch -p0
+	win32/$(pkg)-cygwin.patch -p0
 
 $(pkg)/config.guess -> /tool/config.guess
 $(pkg)/config.sub -> /tool/config.sub
diff --git a/ext/fiddle/win32/libffi-3.2.1-cygwin.patch b/ext/fiddle/win32/libffi-3.2.1-cygwin.patch
new file mode 100644
index 0000000..743be27
--- /dev/null
+++ b/ext/fiddle/win32/libffi-3.2.1-cygwin.patch
@@ -0,0 +1,11 @@ https://github.com/ruby/ruby/blob/trunk/ext/fiddle/win32/libffi-3.2.1-cygwin.patch#L1
+--- libffi-3.2.1/src/closures.c	2014-11-08 21:47:24.000000000 +0900
++++ libffi-3.2.1/src/closures.c	2020-05-26 19:09:26.334088215 +0900
+@@ -26,7 +26,7 @@
+    DEALINGS IN THE SOFTWARE.
+    ----------------------------------------------------------------------- */
+ 
+-#if defined __linux__ && !defined _GNU_SOURCE
++#if (defined __linux__ || defined __CYGWIN__) && !defined _GNU_SOURCE
+ #define _GNU_SOURCE 1
+ #endif
+ 
-- 
cgit v0.10.2


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