Hopefully fix build on appveyor (mingw).

diff --git a/src/plugins/file_system/FileSystem.hpp b/src/plugins/file_system/FileSystem.hpp
index 7711c27..6af95aa 100644 (file)
--- a/src/plugins/file_system/FileSystem.hpp
+++ b/src/plugins/file_system/FileSystem.hpp
@@ -68,7 +68,7 @@ private:
   void* userdata_             = nullptr;
 };
 
-class FileSystemStorageExt {
+XBT_PUBLIC_CLASS FileSystemStorageExt {
 public:
   static simgrid::xbt::Extension<Storage, FileSystemStorageExt> EXTENSION_ID;
   explicit FileSystemStorageExt(Storage* ptr);