Fix compiler diagnositc pragmas and FGDLL definition scope

Author: pradeep

include/ComputeCopy.h

@@ -181,6 +181,9 @@ void copyToGLBuffer(GfxHandle* pGLDestination, ComputeResourceHandle  pSource, c
 #if defined(__GNUC__)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-but-set-variable"
 #endif
 
 #define FORGE_OCL_CHECK(cl_status, message) \

src/backend/common/cmap.hpp

@@ -18,9 +18,12 @@ namespace common
 #if defined(OS_WIN)
 #pragma warning( push )
 #pragma warning( disable : 4305)
-#else
+#elif defined(__GNUC__)
 #pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wformat-truncation"
+#pragma GCC diagnostic ignored "-Wconversion"
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wconversion"
 #endif
 
 /**
@@ -2945,8 +2948,10 @@ static const float cmap_viridis[] =
 
 #if defined(OS_WIN)
 #pragma warning( pop ) // re-enable truncation warning
-#else
+#elif defined(__GNUC__)
 #pragma GCC diagnostic pop
+#elif defined(__clang__)
+#pragma clang diagnostic pop
 #endif
 
 }

src/backend/opengl/CMakeLists.txt

@@ -13,8 +13,7 @@ set_target_properties(${BackendTarget} PROPERTIES SOVERSION ${Forge_VERSION_MAJO
 
 if (WIN32)
     target_compile_definitions(${BackendTarget}
-        PUBLIC FGDLL
-        PRIVATE OS_WIN WIN32_MEAN_AND_LEAN)
+        PRIVATE FGDLL OS_WIN WIN32_MEAN_AND_LEAN)
 
     # C4068: Warnings about unknown pragmas
     # C4275: Warnings about using non-exported classes as base class of an