cmake: add defines to enable useful macroses

8 years ago · e304795622
parent 19e4c7727b
commit e304795622
1 changed files with 4 additions and 0 deletions
--- 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()