OS X: Make param section generation compatible

Tools/px_generate_params.py

@@ -52,8 +52,10 @@ src = """
 // DO NOT EDIT
 // This file is autogenerated from paramaters.xml
 
-static const 
+static const
+#ifndef __PX4_DARWIN
 __attribute__((used, section("__param")))
+#endif
 struct px4_parameters_t px4_parameters_impl = {
 """
 i=0
@@ -79,7 +81,13 @@ src += """
 	%d
 };
 
-extern const struct px4_parameters_t px4_parameters __attribute__((alias("px4_parameters_impl")));
+#ifdef __PX4_DARWIN
+#define ___param__attributes ;
+#else
+#define ___param__attributes __attribute__((alias("px4_parameters_impl")));
+#endif
+
+extern const struct px4_parameters_t px4_parameters ___param__attributes
 """ % i
 
 fp_header.write(header)