Added support for multiplatform shared lib symbol export/import.

CMakeLists.txt

@@ -50,6 +50,7 @@ endif()
 
 target_sources(${PROJECT_NAME} PRIVATE ${source_list})
 target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_20)
+add_compile_definitions(OPENTRACKIO_BUILD)
 
 # Handle debug vs release builds and their separate libs
 

include/opentrackio-cpp/OpenTrackIOProperties.h

@@ -23,6 +23,16 @@
 #define OPEN_TRACK_IO_PROTOCOL_MINOR_VERSION 0
 #define OPEN_TRACK_IO_PROTOCOL_PATCH         1
 
+#ifdef _MSC_VER
+    #ifdef OPENTRACKIO_BUILD
+        #define EXPORT __declspec(dllexport)
+    #else
+        #define EXPORT __declspec(dllimport)
+    #endif
+#else // Support for GCC and Clang.
+    #define EXPORT __attribute__((visibility("default")))
+#endif
+
 namespace opentrackio::opentrackioproperties
 {
     /** Duration of the clip.
@@ -305,8 +315,8 @@ namespace opentrackio::opentrackioproperties
     struct SourceNumber
     {
         /**
-	    * Number that identifies the index of the stream from a source from which data is being transported.
-	    * This is most important in the case where a source is producing multiple streams of samples. */
+        * Number that identifies the index of the stream from a source from which data is being transported.
+        * This is most important in the case where a source is producing multiple streams of samples. */
         uint32_t value;
 
         static std::optional<SourceNumber> parse(nlohmann::json& json, std::vector<std::string>& errors);

include/opentrackio-cpp/OpenTrackIOSample.h

@@ -19,7 +19,7 @@
 
 namespace opentrackio
 {
-    struct OpenTrackIOSample
+    struct EXPORT OpenTrackIOSample
     {
         std::optional<opentrackioproperties::Camera> camera = std::nullopt;
         std::optional<opentrackioproperties::Duration> duration = std::nullopt;