[opencv] 50/53: cmake: fix compiler flags

[Nobuhiro Iwamatsu]

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iwamatsu pushed a commit to annotated tag 2.4.13.3
in repository opencv.

commit 0312df48126270e7131220b71730bd42bea91cbd
Author: Alexander Alekhin <alexander.alekhin at intel.com>
Date:   Mon Jul 24 11:36:21 2017 +0300

    cmake: fix compiler flags
---
 cmake/OpenCVCompilerOptions.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cmake/OpenCVCompilerOptions.cmake b/cmake/OpenCVCompilerOptions.cmake
index 5d41e75..9b2a4e4 100644
--- a/cmake/OpenCVCompilerOptions.cmake
+++ b/cmake/OpenCVCompilerOptions.cmake
@@ -246,7 +246,10 @@ if(CMAKE_COMPILER_IS_GNUCXX)
   endif()
 
   set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} -DNDEBUG")
-  set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0 -DDEBUG -D_DEBUG")
+  if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG} " MATCHES "-O")
+    set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0")
+  endif()
+  set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -DDEBUG -D_DEBUG")
 endif()
 
 if(MSVC)

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