--- a/src/misc2.c
+++ b/src/misc2.c
@@ -4678,80 +4678,3 @@ build_argv_from_list(list_T *l, char ***
 }
 # endif
 #endif
-
-#if defined(FEAT_SESSION) || defined(PROTO)
-/*
- * Generate a script that can be used to restore the current editing session.
- * Save the value of v:this_session before running :mksession in order to make
- * automagic session save fully transparent.  Return TRUE on success.
- */
-    int
-write_session_file(char_u *filename)
-{
-    char_u	    *escaped_filename;
-    char	    *mksession_cmdline;
-    unsigned int    save_ssop_flags;
-    int		    failed;
-
-    /*
-     * Build an ex command line to create a script that restores the current
-     * session if executed.  Escape the filename to avoid nasty surprises.
-     */
-    escaped_filename = vim_strsave_escaped(filename, escape_chars);
-    if (escaped_filename == NULL)
-	return FALSE;
-    mksession_cmdline = alloc(10 + (int)STRLEN(escaped_filename) + 1);
-    if (mksession_cmdline == NULL)
-    {
-	vim_free(escaped_filename);
-	return FALSE;
-    }
-    strcpy(mksession_cmdline, "mksession ");
-    STRCAT(mksession_cmdline, escaped_filename);
-    vim_free(escaped_filename);
-
-    /*
-     * Use a reasonable hardcoded set of 'sessionoptions' flags to avoid
-     * unpredictable effects when the session is saved automatically.  Also,
-     * we definitely need SSOP_GLOBALS to be able to restore v:this_session.
-     * Don't use SSOP_BUFFERS to prevent the buffer list from becoming
-     * enormously large if the GNOME session feature is used regularly.
-     */
-    save_ssop_flags = ssop_flags;
-    ssop_flags = (SSOP_BLANK|SSOP_CURDIR|SSOP_FOLDS|SSOP_GLOBALS
-		  |SSOP_HELP|SSOP_OPTIONS|SSOP_WINSIZE|SSOP_TABPAGES);
-
-    do_cmdline_cmd((char_u *)"let Save_VV_this_session = v:this_session");
-    failed = (do_cmdline_cmd((char_u *)mksession_cmdline) == FAIL);
-    do_cmdline_cmd((char_u *)"let v:this_session = Save_VV_this_session");
-    do_unlet((char_u *)"Save_VV_this_session", TRUE);
-
-    ssop_flags = save_ssop_flags;
-    vim_free(mksession_cmdline);
-
-    /*
-     * Reopen the file and append a command to restore v:this_session,
-     * as if this save never happened.	This is to avoid conflicts with
-     * the user's own sessions.  FIXME: It's probably less hackish to add
-     * a "stealth" flag to 'sessionoptions' -- gotta ask Bram.
-     */
-    if (!failed)
-    {
-	FILE *fd;
-
-	fd = open_exfile(filename, TRUE, APPENDBIN);
-
-	failed = (fd == NULL
-	       || put_line(fd, "let v:this_session = Save_VV_this_session") == FAIL
-	       || put_line(fd, "unlet Save_VV_this_session") == FAIL);
-
-	if (fd != NULL && fclose(fd) != 0)
-	    failed = TRUE;
-
-	if (failed)
-	    mch_remove(filename);
-    }
-
-    return !failed;
-}
-#endif