fixed defines handling

diff --git a/toolsets/gcc.rb b/toolsets/gcc.rb
index 9f7c25eaa530a178384a4e2eb8ab2d292e0014d5..6fcc4edc033ee0cf018ad0b23b47a6399b0cf6c0 100755 (executable)
--- a/toolsets/gcc.rb
+++ b/toolsets/gcc.rb
@@ -36,6 +36,8 @@ module Toolsets
 
         "OBJDUMP" => "objdump",
         "OBJSUFFIX" => ".o",
+
+        "defines" => []
       }
       default_vars.each_pair do |var, val|
         env[var] = val