[system] Find Python libs for OSX with python-config

Author: gempa-jabe

CMakeLists.txt

@@ -39,7 +39,11 @@ EXEC_PROGRAM(
 )
 
 IF (SC_GLOBAL_PYTHON_WRAPPER)
-	FIND_PACKAGE(PythonLibs REQUIRED)
+	IF (APPLE)
+		FIND_PACKAGE(PythonLibsApple REQUIRED)
+	ELSE (APPLE)
+		FIND_PACKAGE(PythonLibs REQUIRED)
+	ENDIF (APPLE)
 	FIND_PACKAGE(PythonInterp REQUIRED)
 ENDIF (SC_GLOBAL_PYTHON_WRAPPER)
 
@@ -85,7 +89,7 @@ IF (APPLE AND ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 ELSEIF (UNIX AND ${CMAKE_SYSTEM_NAME} MATCHES "Linux")
  	SET (LINUX 1)
 ENDIF (APPLE AND ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
- 
+
 # If gcc is installed add -wall and -pedantic to the commandline
 #
 IF (CMAKE_COMPILER_IS_GNUCC)

Modules/FindPythonLibsApple.cmake

@@ -0,0 +1,13 @@
+# the idea comes from here: https://github.com/commontk/PythonQt/issues/24#issuecomment-127639573
+# this overwrite is needed to avoid collision if python version an mac if homebrew python is used
+find_program(PYTHON_CONFIG_EXECUTABLE python-config)
+if (NOT PYTHON_CONFIG_EXECUTABLE)
+	message(SEND_ERROR "python-config executable not found, but python is required.")
+endif()
+# using "python-config --prefix" so that cmake always uses
+# the python that is
+# in the user's path, this is a fix for homebrew on Mac:
+# https://github.com/Homebrew/homebrew/issues/25118
+execute_process(COMMAND ${PYTHON_CONFIG_EXECUTABLE} --prefix OUTPUT_VARIABLE python_prefix OUTPUT_STRIP_TRAILING_WHITESPACE)
+set(PYTHON_INCLUDE_DIR ${python_prefix}/include/python2.7 CACHE PATH "Path to where Python.h is found" FORCE)
+set(PYTHON_LIBRARY ${python_prefix}/lib/libpython2.7${CMAKE_SHARED_LIBRARY_SUFFIX} CACHE PATH "Path to where libpython2.7.dylib is found" FORCE)