Fix standard library lists for Lua 5.3

Fixes crash on require under Lua 5.3 without LUA_COMPAT_5_2.
Fixes utf8 library not loaded under Lua 5.3.

2 files changed, 6 insertions, 0 deletions

diff --git a/src/lanes.lua b/src/lanes.lua
index 210f325..5df406a 100644
--- a/src/lanes.lua
+++ b/src/lanes.lua
@@ -216,6 +216,7 @@ local valid_libs =
         ["math"] = true,
         ["debug"] = true,
         ["bit32"] = true, -- Lua 5.2 only, ignored silently under 5.1
+        ["utf8"] = true, -- Lua 5.3 only, ignored silently under 5.1 and 5.2
         --
         ["base"] = true,
         ["coroutine"] = true, -- part of "base" in Lua 5.1
diff --git a/src/tools.c b/src/tools.c
index 5350e75..3a19605 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -194,8 +194,13 @@ static const luaL_Reg libs[] =
         { LUA_OSLIBNAME, luaopen_os},
         { LUA_IOLIBNAME, luaopen_io},
 #endif // PLATFORM_XBOX
+#if LUA_VERSION_NUM >= 503
+        { LUA_UTF8LIBNAME, luaopen_utf8},
+#endif
 #if LUA_VERSION_NUM >= 502
+#ifdef luaopen_bit32
         { LUA_BITLIBNAME, luaopen_bit32},
+#endif
         { LUA_COLIBNAME, luaopen_coroutine}, // Lua 5.2: coroutine is no longer a part of base!
 #else // LUA_VERSION_NUM
         { LUA_COLIBNAME, NULL},              // Lua 5.1: part of base package