From 35bee663ebf28ee71d968d988811b3546f533e6d Mon Sep 17 00:00:00 2001
From: Hamdi Sahloul <hamdisahloul@hotmail.com>
Date: Thu, 20 Sep 2018 20:55:45 +0900
Subject: [PATCH] JS: Improves Emscripten detection

---
 modules/js/CMakeLists.txt | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/modules/js/CMakeLists.txt b/modules/js/CMakeLists.txt
index 6d713d4bd9..3d7caeb1c3 100644
--- a/modules/js/CMakeLists.txt
+++ b/modules/js/CMakeLists.txt
@@ -9,10 +9,29 @@ set(MODULE_NAME js)
 
 set(OPENCV_JS "opencv.js")
 
+find_path(EMSCRIPTEN_INCLUDE_DIR
+          emscripten/bind.h
+          PATHS
+            ENV EMSCRIPTEN_ROOT
+          PATH_SUFFIXES system/include include
+          DOC "Location of Emscripten SDK")
+
+if(NOT EMSCRIPTEN_INCLUDE_DIR OR NOT PYTHON_DEFAULT_AVAILABLE)
+  set(DISABLE_MSG "Module ${MODULE_NAME} disabled because the following dependencies are not found:")
+  if(NOT EMSCRIPTEN_INCLUDE_DIR)
+    message(STATUS "\${EMSCRIPTEN_INCLUDE_DIR}/emscripten/bind.h` was not detected")
+    set(DISABLE_MSG "${DISABLE_MSG} Emscripten")
+  endif()
+  if(NOT PYTHON_DEFAULT_AVAILABLE)
+    set(DISABLE_MSG "${DISABLE_MSG} Python")
+  endif()
+  message(STATUS ${DISABLE_MSG})
+  ocv_module_disable(${MODULE_NAME})
+endif()
+
 ocv_add_module(${MODULE_NAME} BINDINGS)
 
-# TODO: add emscripten path
-ocv_module_include_directories()
+ocv_module_include_directories(${EMSCRIPTEN_INCLUDE_DIR})
 
 # get list of modules to wrap
 # message(STATUS "Wrapped in ${MODULE_NAME}:")