cmake: add global defines to enable useful macros

b7630a08 · Alexander Alekhin · f4fdd94c · b7630a08
Commit b7630a08 authored Jan 12, 2017 by Alexander Alekhin
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OpenCVModule.cmake cmake/OpenCVModule.cmake +4 -0

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--- a/cmake/OpenCVModule.cmake
+++ b/cmake/OpenCVModule.cmake
@@ -224,6 +224,10 @@ macro(ocv_add_module _name)
    endif()
    if((NOT OPENCV_MODULE_${the_module}_IS_PART_OF_WORLD AND NOT ${the_module} STREQUAL opencv_world) OR NOT ${BUILD_opencv_world})
      project(${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()
  endif()
 endmacro()