From 807ec00b857651a75e633c6f330a30c77590bdde Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@intel.com>
Date: Tue, 20 Feb 2018 13:13:31 +0300
Subject: [PATCH] cmake: fix Ninja warning

about BYPRODUCTS bin/opencv-340.jar
---
 modules/java/jar/CMakeLists.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/java/jar/CMakeLists.txt b/modules/java/jar/CMakeLists.txt
index 4771900848..d34a8e26bf 100644
--- a/modules/java/jar/CMakeLists.txt
+++ b/modules/java/jar/CMakeLists.txt
@@ -21,7 +21,9 @@ set(depends ${the_module}_jar_source_copy "${OPENCV_DEPHELPER}/${the_module}_jar
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/build.xml.in" "${OPENCV_JAVA_DIR}/build.xml" @ONLY)
 list(APPEND depends "${OPENCV_JAVA_DIR}/build.xml")
 
+ocv_cmake_byproducts(__byproducts BYPRODUCTS "${OPENCV_JAR_FILE}")
 add_custom_command(OUTPUT "${OPENCV_DEPHELPER}/${the_module}_jar"
+    ${__byproducts}  # required for add_custom_target() by ninja
     COMMAND ${ANT_EXECUTABLE} -noinput -k jar
     COMMAND ${CMAKE_COMMAND} -E touch "${OPENCV_DEPHELPER}/${the_module}_jar"
     WORKING_DIRECTORY "${OPENCV_JAVA_DIR}"