[Backport release-3_22] [o2] fix static linking on windows (#46064)

* [o2] fix static linking on windows pipacs/o2@1f9604e * Weird char fixup Co-authored-by: Matthias Kuhn <matthias@opengis.ch>
qgis · Nov 16, 2021 · 1a5f304 · 1a5f304
1 parent 8bad5fc
commit 1a5f304
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/external/o2/src/CMakeLists.txt b/external/o2/src/CMakeLists.txt
@@ -192,6 +192,10 @@ endif(BUILD_SHARED_LIBS AND APPLE AND POLICY CMP0042)
 
 add_library( o2 ${o2_SRCS} ${o2_HDRS} )
 
+if(BUILD_SHARED_LIBS)
+    add_definitions( -DO2_SHARED_LIB )
+endif(BUILD_SHARED_LIBS)
+
 if(o2_WITH_QT5)
     target_link_libraries( o2 Qt5::Core Qt5::Network ${LINK_TARGETS})
 else(o2_WITH_QT5)

diff --git a/external/o2/src/o0export.h b/external/o2/src/o0export.h
@@ -1,12 +1,12 @@
 #pragma once
 
 // For exporting symbols from Windows' DLLs
-#ifdef _WIN32
+#if defined (_WIN32) && defined(O2_SHARED_LIB)
     #ifdef O2_DLL_EXPORT
         #define O0_EXPORT __declspec(dllexport)
     #else
         #define O0_EXPORT __declspec(dllimport)
     #endif
 #else
     #define O0_EXPORT
-#endif
+#endif