visibility_control

Author: kazuki0824

include/pkgname/visibility_control.h

@@ -0,0 +1,35 @@
+#ifndef PKGNAME__VISIBILITY_CONTROL_H_
+#define PKGNAME__VISIBILITY_CONTROL_H_
+
+// This logic was borrowed (then namespaced) from the examples on the gcc wiki:
+//     https://gcc.gnu.org/wiki/Visibility
+
+#if defined _WIN32 || defined __CYGWIN__
+  #ifdef __GNUC__
+    #define PKGNAME_EXPORT __attribute__ ((dllexport))
+    #define PKGNAME_IMPORT __attribute__ ((dllimport))
+  #else
+    #define PKGNAME_EXPORT __declspec(dllexport)
+    #define PKGNAME_IMPORT __declspec(dllimport)
+  #endif
+  #ifdef PKGNAME_BUILDING_LIBRARY
+    #define PKGNAME_PUBLIC PKGNAME_EXPORT
+  #else
+    #define PKGNAME_PUBLIC PKGNAME_IMPORT
+  #endif
+  #define PKGNAME_PUBLIC_TYPE PKGNAME_PUBLIC
+  #define PKGNAME_LOCAL
+#else
+  #define PKGNAME_EXPORT __attribute__ ((visibility("default")))
+  #define PKGNAME_IMPORT
+  #if __GNUC__ >= 4
+    #define PKGNAME_PUBLIC __attribute__ ((visibility("default")))
+    #define PKGNAME_LOCAL  __attribute__ ((visibility("hidden")))
+  #else
+    #define PKGNAME_PUBLIC
+    #define PKGNAME_LOCAL
+  #endif
+  #define PKGNAME_PUBLIC_TYPE
+#endif
+
+#endif  // PKGNAME__VISIBILITY_CONTROL_H_