Refactored the HIDDEN macro into its own header

src/msgPrintControl.h

@@ -6,25 +6,11 @@
 #define DefaultMaxRepetitions 4
 
 #include <asynDriver.h>
+#include <macros.h>
 #include <string.h>
 #include <string>
 #include <unordered_map>
 
-/*
-The macro "HIDDEN" hides the symbol of the annotated class / function. This is
-useful to avoid symbol clashes when loading multiple shared libraries in a
-single IOC. To override the hiding, add `-DHIDDEN= ` to your compiler
-flags (in this case, the symbols will be exported with their default
-visibility).
-*/
-#ifndef HIDDEN
-#if defined(_WIN32) || defined(__CYGWIN__)
-#define HIDDEN
-#else
-#define HIDDEN __attribute__((visibility("hidden")))
-#endif
-#endif
-
 /**
  * @brief Class to identify a message print location. See the docstring of
  * `msgPrintControl` on how to use this key.