From 69df0eee77a3ec19d37dff0722f1924de37e7fda Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@intel.com>
Date: Thu, 23 Mar 2017 18:12:48 +0300
Subject: [PATCH] cmake: fix try_compile() with --coverage flags

---
 CMakeLists.txt                    | 4 ++++
 cmake/OpenCVCompilerOptions.cmake | 1 +
 cmake/OpenCVUtils.cmake           | 1 +
 3 files changed, 6 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 68fb108423..7d044583bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -95,6 +95,10 @@ if(POLICY CMP0051)
   cmake_policy(SET CMP0051 NEW)
 endif()
 
+if(POLICY CMP0056)
+  cmake_policy(SET CMP0056 NEW)
+endif()
+
 include(cmake/OpenCVUtils.cmake)
 
 # must go before the project command
diff --git a/cmake/OpenCVCompilerOptions.cmake b/cmake/OpenCVCompilerOptions.cmake
index 0eb68b656e..1656840441 100644
--- a/cmake/OpenCVCompilerOptions.cmake
+++ b/cmake/OpenCVCompilerOptions.cmake
@@ -192,6 +192,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
   if(ENABLE_COVERAGE)
     set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} --coverage")
     set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} --coverage")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --coverage")
   endif()
 
   if(ENABLE_INSTRUMENTATION)
diff --git a/cmake/OpenCVUtils.cmake b/cmake/OpenCVUtils.cmake
index 935bfc2a01..4c065d66f4 100644
--- a/cmake/OpenCVUtils.cmake
+++ b/cmake/OpenCVUtils.cmake
@@ -260,6 +260,7 @@ MACRO(ocv_check_compiler_flag LANG FLAG RESULT)
       TRY_COMPILE(${RESULT}
         "${CMAKE_BINARY_DIR}"
         "${_fname}"
+        CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS=${CMAKE_EXE_LINKER_FLAGS}"   # CMP0056 do this on new CMake
         COMPILE_DEFINITIONS "${FLAG}"
         OUTPUT_VARIABLE OUTPUT)
 
-- 
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