[chore] Log SDL loading error (#827)

Make any future problems similar to koreader/koreader#4627 show up in the log.
koreader · Feb 21, 2019 · 4f753f1 · 4f753f1
1 parent 83c1287
commit 4f753f1
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/ffi/util.lua b/ffi/util.lua
@@ -439,16 +439,24 @@ local haveSDL1 = nil
 local haveSDL2 = nil
 
 function util.haveSDL1()
+    local err
     if haveSDL1 == nil then
-        haveSDL1 = pcall(ffi.load, "SDL")
+        haveSDL1, err = pcall(ffi.load, "SDL")
+    end
+    if not haveSDL1 then
+        print("SDL not loaded:", err)
     end
     return haveSDL1
 end
 
 --- Returns true if SDL2
 function util.haveSDL2()
+    local err
     if haveSDL2 == nil then
-        haveSDL2 = pcall(ffi.load, "SDL2")
+        haveSDL2, err = pcall(ffi.load, "SDL2")
+    end
+    if not haveSDL2 then
+        print("SDL2 not loaded:", err)
     end
     return haveSDL2
 end