cmake: add defines to enable useful macroses

e3047956 · Alexander Alekhin · 19e4c772 · e3047956
Commit e3047956 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
@@ -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()