commit 1b58cdd160c2e0ada0f638679a2aa27e4665fc48
author Bram Moolenaar <Bram@vim.org> Mon Aug 22 23:04:33 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Mon Aug 22 23:04:33 2016 +0200
tree 5a88e5a7aec9e04bc428c6a9e468cb2fc7ae2edb
parent 17f1347b867cbcc0ce380bf9a2466b4c31896f04

patch 7.4.2243
Problem:    Warning for assigning negative value to unsigned. (Danek Duvall)
Solution:   Make cterm_normal_fg_gui_color and _bg_ guicolor_T, cast to long_u
            only when an unsigned is needed.

src/gui.c

diff --git a/src/gui.c b/src/gui.c
index 6f1d8f5..31ddd03 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -4741,7 +4741,7 @@
     int
 gui_get_lightness(guicolor_T pixel)
 {
-    long_u	rgb = gui_mch_get_rgb(pixel);
+    long_u	rgb = (long_u)gui_mch_get_rgb(pixel);
 
     return  (int)(  (((rgb >> 16) & 0xff) * 299)
 		   + (((rgb >> 8) & 0xff) * 587)