Allow finding kicad_3dsg when running from build dir

This might also come in handy later when we use more dynamic libs

common/kiway.cpp

@@ -32,6 +32,7 @@
 #include <config.h>
 #include <core/arraydim.h>
 #include <id.h>
+#include <kiplatform/app.h>
 #include <settings/settings_manager.h>
 #include <logging.h>
 
@@ -199,6 +200,19 @@ KIFACE*  KIWAY::KiFACE( FACE_T aFaceId, bool doLoad )
     {
         wxString dname = dso_search_path( aFaceId );
 
+        // Insert DLL search path for kicad_3dsg from build dir
+        if( wxGetEnv( wxT( "KICAD_RUN_FROM_BUILD_DIR" ), nullptr ) )
+        {
+            wxFileName myPath = wxStandardPaths::Get().GetExecutablePath();
+
+            if( !myPath.GetPath().EndsWith( wxT( "pcbnew" ) ) )
+            {
+                myPath.RemoveLastDir();
+                myPath.AppendDir( wxT( "pcbnew" ) );
+                KIPLATFORM::APP::AddDynamicLibrarySearchPath( myPath.GetPath() );
+            }
+        }
+
         wxDynamicLibrary dso;
 
         void*   addr = NULL;

libs/kiplatform/gtk/app.cpp

@@ -102,3 +102,8 @@ void KIPLATFORM::APP::SetShutdownBlockReason( wxWindow* aWindow, const wxString&
 void KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary()
 {
 }
+
+
+void KIPLATFORM::APP::AddDynamicLibrarySearchPath( const wxString& aPath )
+{
+}

libs/kiplatform/include/kiplatform/app.h

@@ -82,6 +82,15 @@ namespace KIPLATFORM
          * Call as needed in an application to ensure timers are dispatched
          */
         void ForceTimerMessagesToBeCreatedIfNecessary();
+
+        /**
+         * Inserts a search path for loading dynamic libraries.  The exact place this new path ends
+         * up in the dynamic library search order is platform-dependent, but generally this can be
+         * used to make sure dynamic libraries are found in non-standard runtime situations.
+         *
+         * @param aPath is the full path to insert
+         */
+        void AddDynamicLibrarySearchPath( const wxString& aPath );
     }
 }
 

libs/kiplatform/msw/app.cpp

@@ -111,3 +111,9 @@ void KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary()
     MSG msg;
     PeekMessage( &msg, nullptr, WM_TIMER, WM_TIMER, PM_NOREMOVE );
 }
+
+
+void KIPLATFORM::APP::AddDynamicLibrarySearchPath( const wxString& aPath )
+{
+    SetDllDirectoryA( aPath.c_str() );
+}

libs/kiplatform/osx/app.mm

@@ -63,3 +63,8 @@ void KIPLATFORM::APP::SetShutdownBlockReason( wxWindow* aWindow, const wxString&
 void KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary()
 {
 }
+
+
+void KIPLATFORM::APP::AddDynamicLibrarySearchPath( const wxString& aPath )
+{
+}