From 6f2b52bc97318d3177937c3d1b7fb1eb722007a1 Mon Sep 17 00:00:00 2001
From: Viktor Dukhovni <viktor@twosigma.com>
Date: Mon, 7 Oct 2019 20:17:59 -0400
Subject: [PATCH] Expose new Heimdal 8 KRB5_PLUGIN_COMMON_SPI_VERSION macro

---
 lib/krb5/krb5.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/krb5/krb5.h b/lib/krb5/krb5.h
index ea32052f0..7c941673d 100644
--- a/lib/krb5/krb5.h
+++ b/lib/krb5/krb5.h
@@ -881,6 +881,21 @@ enum krb5_plugin_type {
     PLUGIN_TYPE_FUNC /* no longer supported */
 };
 
+/*
+ * Since <krb5/common_plugin.h> is new with Heimdal 8, users looking to write
+ * portable plugins across Heimdal 7 and 8 need a conditional compilation
+ * predicate from a header file that does exist in both major releases.  This
+ * is as good a place as any to define a plugin source-compatibility version
+ * number.
+ *
+ * When this macro is defined and is equal to 1, the Heimdal 8 plugin source
+ * API, and <krb5/common_plugin.h> header are available and should be used.
+ *
+ * In Heimdal 7, this macro is not defined, and <krb5/common_plugin.h> may not
+ * be available.
+ */
+#define KRB5_PLUGIN_COMMON_SPI_VERSION 1
+
 #define KRB5_PLUGIN_INVOKE_ALL  1
 
 typedef uintptr_t