[opencv] 13/53: cmake: add defines to enable useful macroses

[Nobuhiro Iwamatsu]

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

commit e3047956229d3ed90885801463ef19affeeaa630
Author: Alexander Alekhin <alexander.alekhin at intel.com>
Date:   Thu Jan 12 19:14:51 2017 +0300

    cmake: add defines to enable useful macroses
---
 cmake/OpenCVModule.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmake/OpenCVModule.cmake b/cmake/OpenCVModule.cmake
index 925731b..c5a81b2 100644
--- a/cmake/OpenCVModule.cmake
+++ b/cmake/OpenCVModule.cmake
@@ -170,6 +170,10 @@ macro(ocv_add_module _name)
       return() # extra protection from redefinition
     endif()
     project(${the_module})
+    add_definitions(
+        -D_USE_MATH_DEFINES  # M_PI constant in MSVS
+        -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS  # to use C libraries from C++ code (ffmpeg)
+    )
   endif(OPENCV_INITIAL_PASS)
 endmacro()
 

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