diff --git a/src/Makefile b/src/Makefile
index f27e20d..03ee7c2 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -533,6 +533,14 @@
 #PROFILE_CFLAGS = -pg -g
 #PROFILE_LIBS = -pg
 
+# MEMORY LEAK DETECTION
+# Requires installing the ccmalloc library.
+# Configuration is in the .ccmalloc file.
+# Doesn't work very well, since memory linked to from global variables
+# (indirectly) is also marked as leaked memory.
+#PROFILE_CFLAGS = -DEXITFREE
+#PROFILE_LIBS = -lccmalloc
+
 #####################################################
 ###  Specific systems, check if yours is listed!  ### {{{
 #####################################################
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index fa94424..af3e7f9 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -46,7 +46,6 @@
 
 static void do_ucmd __ARGS((exarg_T *eap));
 static void ex_command __ARGS((exarg_T *eap));
-static void ex_comclear __ARGS((exarg_T *eap));
 static void ex_delcommand __ARGS((exarg_T *eap));
 # ifdef FEAT_CMDL_COMPL
 static char_u *get_user_command_name __ARGS((int idx));
@@ -5390,12 +5389,10 @@
 
 /*
  * ":comclear"
- */
-/*ARGSUSED*/
-/*
  * Clear all user commands, global and for current buffer.
  */
-    static void
+/*ARGSUSED*/
+    void
 ex_comclear(eap)
     exarg_T	*eap;
 {
diff --git a/src/fileio.c b/src/fileio.c
index 9ae69cf..dd42fb4 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -7093,6 +7093,17 @@
     }
 }
 
+#if defined(EXITFREE) || defined(PROTO)
+    void
+free_all_autocmds()
+{
+    for (current_augroup = -1; current_augroup < augroups.ga_len;
+							    ++current_augroup)
+	do_autocmd((char_u *)"", TRUE);
+    ga_clear_strings(&augroups);
+}
+#endif
+
 /*
  * Return the event number for event name "start".
  * Return NUM_EVENTS if the event name was not found.
@@ -7632,9 +7643,9 @@
 							 &ap->allow_dirs, TRUE);
 		    if (reg_pat != NULL)
 			ap->reg_prog = vim_regcomp(reg_pat, RE_MAGIC);
+		    vim_free(reg_pat);
 		    if (reg_pat == NULL || ap->reg_prog == NULL)
 		    {
-			vim_free(reg_pat);
 			vim_free(ap->pat);
 			vim_free(ap);
 			return FAIL;
diff --git a/src/message.c b/src/message.c
index 535d65a..a43cb92 100644
--- a/src/message.c
+++ b/src/message.c
@@ -743,13 +743,8 @@
 
     /* Don't let the message history get too big */
     while (msg_hist_len > 20)
-    {
-	p = first_msg_hist;
-	first_msg_hist = p->next;
-	vim_free(p->msg);
-	vim_free(p);
-	--msg_hist_len;
-    }
+	(void)delete_first_msg();
+
     /* allocate an entry and add the message at the end of the history */
     p = (struct msg_hist *)alloc((int)sizeof(struct msg_hist));
     if (p != NULL)
@@ -777,6 +772,25 @@
 }
 
 /*
+ * Delete the first (oldest) message from the history.
+ * Returns FAIL if there are no messages.
+ */
+    int
+delete_first_msg()
+{
+    struct msg_hist *p;
+
+    if (msg_hist_len <= 0)
+	return FAIL;
+    p = first_msg_hist;
+    first_msg_hist = p->next;
+    vim_free(p->msg);
+    vim_free(p);
+    --msg_hist_len;
+    return OK;
+}
+
+/*
  * ":messages" command.
  */
 /*ARGSUSED*/
diff --git a/src/os_unix.c b/src/os_unix.c
index ba74a2d..d27b05a 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -2699,6 +2699,24 @@
 #endif
 }
 
+#if defined(EXITFREE) || defined(PROTO)
+    void
+mch_free_mem()
+{
+# if defined(HAVE_SIGALTSTACK) || defined(HAVE_SIGSTACK)
+    vim_free(signal_stack);
+# endif
+# if (defined(FEAT_X11) && defined(FEAT_XCLIPBOARD)) || defined(PROTO)
+    if (xterm_Shell != (Widget)0)
+	XtDestroyWidget(xterm_Shell);
+    if (xterm_dpy != NULL)
+	XtCloseDisplay(xterm_dpy);
+    if (app_context != (XtAppContext)NULL)
+	XtDestroyApplicationContext(app_context);
+# endif
+}
+#endif
+
 static void exit_scroll __ARGS((void));
 
 /*
@@ -2796,6 +2814,11 @@
     if (usingNetbeans)
 	netbeans_send_disconnect();
 #endif
+
+#ifdef EXITFREE
+    free_all_mem();
+#endif
+
     exit(r);
 }
 
diff --git a/src/proto/ex_docmd.pro b/src/proto/ex_docmd.pro
index 9a0fd2b..3a8200e 100644
--- a/src/proto/ex_docmd.pro
+++ b/src/proto/ex_docmd.pro
@@ -15,6 +15,7 @@
 char_u *find_nextcmd __ARGS((char_u *p));
 char_u *check_nextcmd __ARGS((char_u *p));
 char_u *get_command_name __ARGS((expand_T *xp, int idx));
+void ex_comclear __ARGS((exarg_T *eap));
 void uc_clear __ARGS((garray_T *gap));
 char_u *get_user_commands __ARGS((expand_T *xp, int idx));
 char_u *get_user_cmd_flags __ARGS((expand_T *xp, int idx));
diff --git a/src/proto/ex_getln.pro b/src/proto/ex_getln.pro
index 97d3c2f..688eb3d 100644
--- a/src/proto/ex_getln.pro
+++ b/src/proto/ex_getln.pro
@@ -25,6 +25,7 @@
 int expand_cmdline __ARGS((expand_T *xp, char_u *str, int col, int *matchcount, char_u ***matches));
 int ExpandGeneric __ARGS((expand_T *xp, regmatch_T *regmatch, int *num_file, char_u ***file, char_u *((*func)(expand_T *, int))));
 char_u *globpath __ARGS((char_u *path, char_u *file));
+void init_history __ARGS((void));
 int get_histtype __ARGS((char_u *name));
 void add_to_history __ARGS((int histype, char_u *new_entry, int in_map, int sep));
 int get_history_idx __ARGS((int histype));
diff --git a/src/proto/message.pro b/src/proto/message.pro
index f6b29a2..d76182d 100644
--- a/src/proto/message.pro
+++ b/src/proto/message.pro
@@ -11,6 +11,7 @@
 void emsg_invreg __ARGS((int name));
 char_u *msg_trunc_attr __ARGS((char_u *s, int force, int attr));
 char_u *msg_may_trunc __ARGS((int force, char_u *s));
+int delete_first_msg __ARGS((void));
 void ex_messages __ARGS((exarg_T *eap));
 void msg_end_prompt __ARGS((void));
 void wait_return __ARGS((int redraw));
@@ -34,7 +35,6 @@
 void msg_prt_line __ARGS((char_u *s, int list));
 void msg_puts __ARGS((char_u *s));
 void msg_puts_title __ARGS((char_u *s));
-void msg_puts_long __ARGS((char_u *longstr));
 void msg_puts_long_attr __ARGS((char_u *longstr, int attr));
 void msg_puts_long_len_attr __ARGS((char_u *longstr, int len, int attr));
 void msg_puts_attr __ARGS((char_u *s, int attr));
diff --git a/src/proto/ops.pro b/src/proto/ops.pro
index 5952b95..da9973b 100644
--- a/src/proto/ops.pro
+++ b/src/proto/ops.pro
@@ -29,6 +29,7 @@
 void op_insert __ARGS((oparg_T *oap, long count1));
 int op_change __ARGS((oparg_T *oap));
 void init_yank __ARGS((void));
+void clear_registers __ARGS((void));
 int op_yank __ARGS((oparg_T *oap, int deleting, int mess));
 void do_put __ARGS((int regname, int dir, long count, int flags));
 int preprocs_left __ARGS((void));
diff --git a/src/proto/syntax.pro b/src/proto/syntax.pro
index 3a29674..967d88e 100644
--- a/src/proto/syntax.pro
+++ b/src/proto/syntax.pro
@@ -15,13 +15,14 @@
 void init_highlight __ARGS((int both, int reset));
 int load_colors __ARGS((char_u *name));
 void do_highlight __ARGS((char_u *line, int forceit, int init));
+void free_highlight __ARGS((void));
 void restore_cterm_colors __ARGS((void));
 void set_normal_colors __ARGS((void));
 char_u *hl_get_font_name __ARGS((void));
 void hl_set_font_name __ARGS((char_u *font_name));
 void hl_set_bg_color_name __ARGS((char_u *name));
 void hl_set_fg_color_name __ARGS((char_u *name));
-int hl_combine_attr __ARGS((int char_attr, int spell_attr));
+int hl_combine_attr __ARGS((int char_attr, int prim_attr));
 attrentry_T *syn_gui_attr2entry __ARGS((int attr));
 attrentry_T *syn_term_attr2entry __ARGS((int attr));
 attrentry_T *syn_cterm_attr2entry __ARGS((int attr));
diff --git a/src/spell.c b/src/spell.c
index 4ff413a..c5d8122 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -2098,6 +2098,7 @@
     garray_T	ga;
     char_u	*splp;
     char_u	*region;
+    int		filename;
     int		region_mask;
     slang_T	*lp;
     int		c;
@@ -2125,34 +2126,55 @@
 	/* Get one language name. */
 	copy_option_part(&splp, lang, MAXWLEN, ",");
 
-	/* If there is a region name let "region" point to it and remove it
-	 * from the name. */
 	region = NULL;
 	len = STRLEN(lang);
-	if (len > 3 && lang[len - 3] == '_')
-	{
-	    region = lang + len - 2;
-	    len -= 3;
-	    lang[len] = NUL;
-	}
 
-	/* Check if we loaded this language before. */
-	for (lp = first_lang; lp != NULL; lp = lp->sl_next)
-	    if (STRICMP(lp->sl_name, lang) == 0)
-		break;
+	/* If the name ends in ".spl" use it as the name of the spell file.
+	 * If there is a region name let "region" point to it and remove it
+	 * from the name. */
+	if (len > 4 && fnamecmp(lang + len - 4, ".spl") == 0)
+	{
+	    filename = TRUE;
+
+	    /* Check if we loaded this language before. */
+	    for (lp = first_lang; lp != NULL; lp = lp->sl_next)
+		if (fullpathcmp(lang, lp->sl_fname, FALSE) == FPC_SAME)
+		    break;
+	}
+	else
+	{
+	    filename = FALSE;
+	    if (len > 3 && lang[len - 3] == '_')
+	    {
+		region = lang + len - 2;
+		len -= 3;
+		lang[len] = NUL;
+	    }
+
+	    /* Check if we loaded this language before. */
+	    for (lp = first_lang; lp != NULL; lp = lp->sl_next)
+		if (STRICMP(lang, lp->sl_name) == 0)
+		    break;
+	}
 
 	/* If not found try loading the language now. */
 	if (lp == NULL)
-	    spell_load_lang(lang);
+	{
+	    if (filename)
+		(void)spell_load_file(lang, lang, NULL, FALSE);
+	    else
+		spell_load_lang(lang);
+	}
 
 	/*
 	 * Loop over the languages, there can be several files for "lang".
 	 */
 	for (lp = first_lang; lp != NULL; lp = lp->sl_next)
-	    if (STRICMP(lp->sl_name, lang) == 0)
+	    if (filename ? fullpathcmp(lang, lp->sl_fname, FALSE) == FPC_SAME
+			 : STRICMP(lang, lp->sl_name) == 0)
 	    {
 		region_mask = REGION_ALL;
-		if (region != NULL)
+		if (!filename && region != NULL)
 		{
 		    /* find region in sl_regions */
 		    c = find_region(lp->sl_regions, region);
@@ -2311,6 +2333,29 @@
     return 0;
 }
 
+# if defined(FEAT_MBYTE) || defined(EXITFREE) || defined(PROTO)
+/*
+ * Free all languages.
+ */
+    void
+spell_free_all()
+{
+    slang_T	*lp;
+    buf_T	*buf;
+
+    /* Go through all buffers and handle 'spelllang'. */
+    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
+	ga_clear(&buf->b_langp);
+
+    while (first_lang != NULL)
+    {
+	lp = first_lang;
+	first_lang = lp->sl_next;
+	slang_free(lp);
+    }
+}
+# endif
+
 # if defined(FEAT_MBYTE) || defined(PROTO)
 /*
  * Clear all spelling tables and reload them.
@@ -2320,25 +2365,17 @@
 spell_reload()
 {
     buf_T	*buf;
-    slang_T	*lp;
     win_T	*wp;
 
     /* Initialize the table for SPELL_ISWORDP(). */
     init_spell_chartab();
 
     /* Unload all allocated memory. */
-    while (first_lang != NULL)
-    {
-	lp = first_lang;
-	first_lang = lp->sl_next;
-	slang_free(lp);
-    }
+    spell_free_all();
 
     /* Go through all buffers and handle 'spelllang'. */
     for (buf = firstbuf; buf != NULL; buf = buf->b_next)
     {
-	ga_clear(&buf->b_langp);
-
 	/* Only load the wordlists when 'spelllang' is set and there is a
 	 * window for this buffer in which 'spell' is set. */
 	if (*buf->b_p_spl != NUL)
@@ -5290,6 +5327,8 @@
     vim_memset(su, 0, sizeof(suginfo_T));
     ga_init2(&su->su_ga, (int)sizeof(suggest_T), 10);
     ga_init2(&su->su_sga, (int)sizeof(suggest_T), 10);
+    if (*badptr == NUL)
+	return;
     hash_init(&su->su_banned);
 
     su->su_badptr = badptr;
@@ -7047,6 +7086,8 @@
 	hi = hash_lookup(&su->su_banned, s, hash);
 	if (HASHITEM_EMPTY(hi))
 	    hash_add_item(&su->su_banned, hi, s, hash);
+	else
+	    vim_free(s);
     }
 }
 
@@ -7920,10 +7961,15 @@
 						       & lp->lp_region) != 0))
 			{
 			    word[depth] = NUL;
-			    dump_word(word, round, flags, lnum++);
+
+			    /* Dump the basic word if there is no prefix or
+			     * when it's the first one. */
+			    c = (unsigned)flags >> 16;
+			    if (c == 0 || curi[depth] == 2)
+				dump_word(word, round, flags, lnum++);
 
 			    /* Apply the prefix, if there is one. */
-			    if ((unsigned)flags >> 16 != 0)
+			    if (c != 0)
 				lnum = apply_prefixes(slang, word, round,
 								 flags, lnum);
 			}
diff --git a/src/window.c b/src/window.c
index 0d77a3a..cb9e30a 100644
--- a/src/window.c
+++ b/src/window.c
@@ -26,6 +26,7 @@
 static void win_rotate __ARGS((int, int));
 static void win_totop __ARGS((int size, int flags));
 static void win_equal_rec __ARGS((win_T *next_curwin, int current, frame_T *topfr, int dir, int col, int row, int width, int height));
+static win_T *win_free_mem __ARGS((win_T *win, int *dirp));
 static win_T *winframe_remove __ARGS((win_T *win, int *dirp));
 static frame_T *win_altframe __ARGS((win_T *win));
 static win_T *frame2win __ARGS((frame_T *frp));
@@ -1808,7 +1809,6 @@
     int		other_buffer = FALSE;
 #endif
     int		close_curwin = FALSE;
-    frame_T	*frp;
     int		dir;
     int		help_window = FALSE;
 
@@ -1864,14 +1864,8 @@
     if (!win_valid(win) || firstwin == lastwin)
 	return;
 
-    /* reduce the reference count to the argument list. */
-    alist_unlink(win->w_alist);
-
-    /* remove the window and its frame from the tree of frames. */
-    frp = win->w_frame;
-    wp = winframe_remove(win, &dir);
-    vim_free(frp);
-    win_free(win);
+    /* Free the memory used for the window. */
+    wp = win_free_mem(win, &dir);
 
     /* Make sure curwin isn't invalid.  It can cause severe trouble when
      * printing an error message.  For win_equal() curbuf needs to be valid
@@ -1950,6 +1944,41 @@
 }
 
 /*
+ * Free the memory used for a window.
+ * Returns a pointer to the window that got the freed up space.
+ */
+    static win_T *
+win_free_mem(win, dirp)
+    win_T	*win;
+    int		*dirp;		/* set to 'v' or 'h' for direction if 'ea' */
+{
+    frame_T	*frp;
+    win_T	*wp;
+
+    /* reduce the reference count to the argument list. */
+    alist_unlink(win->w_alist);
+
+    /* remove the window and its frame from the tree of frames. */
+    frp = win->w_frame;
+    wp = winframe_remove(win, dirp);
+    vim_free(frp);
+    win_free(win);
+
+    return wp;
+}
+
+#if defined(EXITFREE) || defined(PROTO)
+    void
+win_free_all()
+{
+    int		dummy;
+
+    while (firstwin != NULL)
+	(void)win_free_mem(firstwin, &dummy);
+}
+#endif
+
+/*
  * Remove a window and its frame from the tree of frames.
  * Returns a pointer to the window that got the freed up space.
  */
@@ -1968,6 +1997,9 @@
      * Remove the window from its frame.
      */
     frp2 = win_altframe(win);
+    if (frp2 == NULL)
+	return NULL;	    /* deleted the last frame */
+
     wp = frame2win(frp2);
 
     /* Remove this frame from the list of frames. */
@@ -2068,7 +2100,7 @@
 
     frp = win->w_frame;
 #ifdef FEAT_VERTSPLIT
-    if (frp->fr_parent->fr_layout == FR_ROW)
+    if (frp->fr_parent != NULL && frp->fr_parent->fr_layout == FR_ROW)
 	b = p_spr;
     else
 #endif