From 9bac55a0ac7365b241df8a3dacbdacf59698c862 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sat, 28 Apr 2018 17:26:33 +0200
Subject: tracker/aruco: ensure using right ABI

---
 tracker-aruco/CMakeLists.txt       | 20 ++++++++++++++++++--
 tracker-aruco/compile-test/abi.cpp | 11 +++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)
 create mode 100644 tracker-aruco/compile-test/abi.cpp

diff --git a/tracker-aruco/CMakeLists.txt b/tracker-aruco/CMakeLists.txt
index b9f62a07..84dc7fba 100644
--- a/tracker-aruco/CMakeLists.txt
+++ b/tracker-aruco/CMakeLists.txt
@@ -2,9 +2,25 @@ find_package(OpenCV QUIET)
 if(OpenCV_FOUND)
     set(SDK_ARUCO_LIBPATH "" CACHE FILEPATH "Aruco paper marker tracker static library path")
     if(SDK_ARUCO_LIBPATH)
+        set(modules "${SDK_ARUCO_LIBPATH}" opencv_core opencv_calib3d opencv_imgproc opencv_videoio)
+
+        file(TIMESTAMP "${SDK_ARUCO_LIBPATH}" tm "%s" UTC)
+        set(cache-str "${tm}|${SDK_ARUCO_LIBPATH}")
+
+        if(NOT aruco_has-working-abi STREQUAL "${cache-str}")
+            try_compile(result "${CMAKE_CURRENT_BINARY_DIR}"
+                               SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/compile-test/abi.cpp"
+                               OUTPUT_VARIABLE krap
+                               LINK_LIBRARIES ${modules})
+            if(NOT result)
+                message(FATAL_ERROR "${krap}\n" "Must use Aruco fork from <https://github.com/opentrack/aruco>")
+            endif()
+
+            set(aruco_has-working-abi "${cache-str}" CACHE INTERNAL "" FORCE)
+        endif()
+
         otr_module(tracker-aruco)
-        set(modules opencv_core opencv_calib3d opencv_imgproc opencv_videoio)
-        target_link_libraries(opentrack-tracker-aruco opentrack-cv ${SDK_ARUCO_LIBPATH} ${modules})
+        target_link_libraries(opentrack-tracker-aruco opentrack-cv ${modules})
         target_include_directories(opentrack-tracker-aruco SYSTEM PUBLIC ${OpenCV_INCLUDE_DIRS})
     endif()
 endif()
diff --git a/tracker-aruco/compile-test/abi.cpp b/tracker-aruco/compile-test/abi.cpp
new file mode 100644
index 00000000..633188de
--- /dev/null
+++ b/tracker-aruco/compile-test/abi.cpp
@@ -0,0 +1,11 @@
+#include "../../compat/linkage-macros.hpp"
+
+#define ARUCO_ABI aruco_opentrack_fork_abi_1
+
+extern "C" void ARUCO_ABI(void);
+
+int main(void)
+{
+    ARUCO_ABI();
+    return 0;
+}
-- 
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