From b20695380f8cc65d8b58cd524f296382ba8ef2e7 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Tue, 17 Aug 2021 21:22:35 +0200
Subject: video: workaround cmake/ninja bug

---
 video/camera.hpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'video')

diff --git a/video/camera.hpp b/video/camera.hpp
index a0fe0adb..d4d17c8f 100644
--- a/video/camera.hpp
+++ b/video/camera.hpp
@@ -75,9 +75,17 @@ void register_camera(std::unique_ptr<impl::camera_> metadata);
     static const char init_ ## ctr =                                    \
         (::video::impl::register_camera(std::make_unique<type>()), 0);
 
-#define OTR_REGISTER_CAMERA2(type, ctr) \
-    OTR_REGISTER_CAMERA3(type, ctr)
+#ifdef _MSC_VER
+    // shared library targets without any symbols break cmake build
+#   define OTR_REGISTER_CAMERA_IMPL() \
+    extern "C" __declspec(dllexport) [[maybe_unused]] void _opentrack_module(void) {}
+#else
+#   define OTR_REGISTER_CAMERA_IMPL()
+#endif
 
+#define OTR_REGISTER_CAMERA2(type, ctr) \
+    OTR_REGISTER_CAMERA3(type, ctr)     \
+    OTR_REGISTER_CAMERA_IMPL()
 #define OTR_REGISTER_CAMERA(type) \
     OTR_REGISTER_CAMERA2(type, __COUNTER__)
 
-- 
cgit v1.2.3