From 3d0e7a956afb6f913466e96bd462eff0c92ad4c6 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sat, 1 May 2021 17:46:03 +0200
Subject: patch 8.2.2821: MS-Windows: unnessarily loading libraries when
 registering OLE

Problem:    MS-Windows: unnessarily loading libraries when registering OLE.
Solution:   Skip loading libraries when invoked with "-register".
---
 src/globals.h  |  1 +
 src/main.c     | 14 ++++++++++++++
 src/os_win32.c |  4 ++++
 src/version.c  |  2 ++
 4 files changed, 21 insertions(+)

diff --git a/src/globals.h b/src/globals.h
index 5e6b6461d9..b6541a4f4f 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1311,6 +1311,7 @@ EXTERN int  wild_menu_showing INIT(= 0);
 #ifdef MSWIN
 EXTERN char_u	toupper_tab[256];	// table for toupper()
 EXTERN char_u	tolower_tab[256];	// table for tolower()
+EXTERN int	found_register_arg INIT(= FALSE);
 #endif
 
 #ifdef FEAT_LINEBREAK
diff --git a/src/main.c b/src/main.c
index 30014d4be2..686fb14324 100644
--- a/src/main.c
+++ b/src/main.c
@@ -161,6 +161,20 @@ main
 	    break;
 	}
 #endif
+#ifdef MSWIN
+    // Need to find "-register" before loading any libraries.
+    for (i = 1; i < argc; ++i)
+	if (STRICMP(argv[i] + 1, "register") == 0
+				   && (argv[i][0] == '-' || argv[i][0] == '/'))
+	{
+	    found_register_arg = TRUE;
+	    break;
+	}
+#endif
+
+    /*
+     * Various initialisations shared with tests.
+     */
     common_init(&params);
 
 #ifdef VIMDLL
diff --git a/src/os_win32.c b/src/os_win32.c
index d40d0332c2..3bfeee66ec 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -529,6 +529,10 @@ vimLoadLib(char *name)
 {
     HINSTANCE	dll = NULL;
 
+    // No need to load any library when registering OLE.
+    if (found_register_arg)
+	return dll;
+
     // NOTE: Do not use mch_dirname() and mch_chdir() here, they may call
     // vimLoadLib() recursively, which causes a stack overflow.
     if (exe_path == NULL)
diff --git a/src/version.c b/src/version.c
index ed632f7ba9..8140e20fa7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2821,
 /**/
     2820,
 /**/
-- 
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