cmake: Check for required Cython package

Added a FindCython.cmake, Cython is required.

Signed-off-by: Ali Maredia <[email protected]>

CMakeLists.txt

@@ -152,6 +152,7 @@ find_package(expat REQUIRED)
 set(HAVE_EXPAT ${EXPAT_FOUND})
 endif(${WITH_EXPAT})
 
+find_package(Cython REQUIRED)
 find_package(fcgi REQUIRED)
 
 find_package(atomic_ops REQUIRED)

cmake/modules/FindCython.cmake

@@ -0,0 +1,79 @@
+#
+# Cython
+#
+
+# This finds the "cython" executable in your PATH, and then in some standard
+# paths:
+FIND_FILE(CYTHON_BIN cython /usr/bin /usr/local/bin)
+SET(CYTHON_FLAGS --cplus --fast-fail)
+
+SET(Cython_FOUND FALSE)
+IF (CYTHON_BIN)
+    # Try to run Cython, to make sure it works:
+    execute_process(
+        COMMAND ${CYTHON_BIN} ${CYTHON_FLAGS} ${CMAKE_MODULE_PATH}/cython_test.pyx
+        RESULT_VARIABLE CYTHON_RESULT
+        OUTPUT_QUIET
+        ERROR_QUIET
+        )
+    if (CYTHON_RESULT EQUAL 0)
+        # Only if cython exits with the return code 0, we know that all is ok:
+        SET(Cython_FOUND TRUE)
+        SET(Cython_Compilation_Failed FALSE)
+    else (CYTHON_RESULT EQUAL 0)
+        SET(Cython_Compilation_Failed TRUE)
+    endif (CYTHON_RESULT EQUAL 0)
+ENDIF (CYTHON_BIN)
+
+
+IF (Cython_FOUND)
+        IF (NOT Cython_FIND_QUIETLY)
+                MESSAGE(STATUS "Found CYTHON: ${CYTHON_BIN}")
+        ENDIF (NOT Cython_FIND_QUIETLY)
+ELSE (Cython_FOUND)
+        IF (Cython_FIND_REQUIRED)
+        if(Cython_Compilation_Failed)
+            MESSAGE(STATUS "Found CYTHON: ${CYTHON_BIN}")
+        else(Cython_Compilation_Failed)
+            MESSAGE(FATAL_ERROR "Could not find Cython. Please install Cython.")
+        endif(Cython_Compilation_Failed)
+        ENDIF (Cython_FIND_REQUIRED)
+ENDIF (Cython_FOUND)
+
+
+# This allows to link Cython files
+# Examples:
+# 1) to compile assembly.pyx to assembly.so:
+#   CYTHON_ADD_MODULE(assembly)
+# 2) to compile assembly.pyx and something.cpp to assembly.so:
+#   CYTHON_ADD_MODULE(assembly something.cpp)
+
+if(NOT CYTHON_INCLUDE_DIRECTORIES)
+    set(CYTHON_INCLUDE_DIRECTORIES .)
+endif(NOT CYTHON_INCLUDE_DIRECTORIES)
+
+# Cythonizes the .pyx files into .cpp file (but doesn't compile it)
+macro(CYTHON_ADD_MODULE_PYX name)
+    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.pxd)
+        set(DEPENDS ${name}.pyx ${name}.pxd)
+    else(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.pxd)
+        set(DEPENDS ${name}.pyx)
+    endif(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${name}.pxd)
+    # Allow the user to specify dependencies as optional arguments
+    set(DEPENDS ${DEPENDS} ${ARGN})
+    add_custom_command(
+        OUTPUT ${name}.cpp
+        COMMAND ${CYTHON_BIN}
+        ARGS ${CYTHON_FLAGS} -I ${CYTHON_INCLUDE_DIRECTORIES} -o ${name}.cpp ${CMAKE_CURRENT_SOURCE_DIR}/${name}.pyx
+        DEPENDS ${DEPENDS}
+        COMMENT "Cythonizing ${name}.pyx")
+endmacro(CYTHON_ADD_MODULE_PYX)
+
+# Cythonizes and compiles a .pyx file
+macro(CYTHON_ADD_MODULE name)
+    CYTHON_ADD_MODULE_PYX(${name})
+    # We need Python for this:
+    find_package(Python REQUIRED)
+    add_python_library(${name} ${name}.cpp ${ARGN})
+endmacro(CYTHON_ADD_MODULE)
+