added cmake support

CMakeLists.txt

@@ -0,0 +1,137 @@
+cmake_minimum_required(VERSION 3.13)
+
+####################################################################################################
+# User configurable options
+####################################################################################################
+
+option(FREERTOS_CREATE_GCC_SECTIONS 
+    "Generate sections for functions and data. Required to remove unused code" ON
+)
+if(FREERTOS_CREATE_GCC_SECTIONS)
+    option(FREERTOS_REMOVE_UNUSED_CODE "Remove unused code." ON)
+endif()
+
+####################################################################################################
+# Pre project configuration
+####################################################################################################
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    if(NOT FREERTOS_WARNING_FLAGS)
+        set(FREERTOS_WARNING_FLAGS
+            -Wall
+            -Wextra
+            -Wimplicit-fallthrough=1
+            -Wno-unused-parameter
+            -Wshadow=local
+        )
+    endif()
+endif()
+
+set(LIB_FREERTOS_NAME freertos)
+add_library(${LIB_FREERTOS_NAME})
+
+####################################################################################################
+# Source file handling
+####################################################################################################
+
+# Convert supplied additional sources to absolute path version. The user should set
+# a list of sources like the port source and the selected memory management source file.
+foreach(FREERTOS_ADDITIONAL_SRC ${FREERTOS_ADDITIONAL_SOURCES})
+	if(IS_ABSOLUTE ${FREERTOS_ADDITIONAL_SRC})
+		set(CURRENT_ADDITIONAL_SRC ${FREERTOS_ADDITIONAL_SRC})
+	else()
+		get_filename_component(CURRENT_ADDITIONAL_SRC
+			${FREERTOS_ADDITIONAL_SRC} REALPATH BASE_DIR ${CMAKE_SOURCE_DIR}
+		)
+	endif()
+	
+	if(CMAKE_VERBOSE)
+        message(STATUS "FreeRTOS port source: ${FREERTOS_ADDITIONAL_SRC}")
+    endif()
+	list(APPEND FREERTOS_ADDITIONAL_SOURCES_ABS ${CURRENT_ADDITIONAL_SRC})
+endforeach()
+
+target_sources(${LIB_FREERTOS_NAME}  PRIVATE
+	croutine.c
+	event_groups.c
+	list.c
+	queue.c
+	stream_buffer.c
+	tasks.c
+	timers.c
+)
+
+if(NOT FREERTOS_ADDITIONAL_SOURCES)
+	message(WARNING 
+		"FREERTOS_ADDITIONAL_SOURCES list of FreeRTOS includes was not " 
+		"supplied, build might fail!"
+	)
+endif()
+
+####################################################################################################
+# Include handling
+####################################################################################################
+
+# Convert supplied FreeRTOS includes paths to absolute paths. The user should set
+# the path containing files like FreeRTOSConfig.h
+foreach(FREERTOS_ADDITIONAL_INC ${FREERTOS_ADDITIONAL_INCLUDE_PATHS})
+	if(IS_ABSOLUTE ${FREERTOS_ADDITIONAL_INC})
+		set(CURR_ADDITIONAL_INC_ABS "${FREERTOS_ADDITIONAL_INC}")
+	else()
+		get_filename_component(CURR_ADDITIONAL_INC_ABS
+			${FREERTOS_ADDITIONAL_INC} REALPATH BASE_DIR ${CMAKE_SOURCE_DIR})
+	endif()
+	
+	if(CMAKE_VERBOSE)
+		message(STATUS "FreeRTOS configuration path: ${CURR_ABS_FREERTOS_PATH}")
+	endif()
+	
+	list(APPEND FREERTOS_ADDITIONAL_INC_PATHS_ABS ${CURR_ADDITIONAL_INC_ABS})
+endforeach()
+
+# Also considers the case where the user packages the header files into a freertos folder again
+target_include_directories(${LIB_FREERTOS_NAME} INTERFACE
+    ${CMAKE_CURRENT_SOURCE_DIR}/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/freertos
+    ${FREERTOS_ADDITIONAL_INC_PATHS_ABS}
+)
+
+target_include_directories(${LIB_FREERTOS_NAME} PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/freertos
+    ${FREERTOS_ADDITIONAL_INC_PATHS_ABS}
+)
+
+####################################################################################################
+# Library handling
+####################################################################################################
+
+if(FREERTOS_ADDITIONAL_LIBS)
+    target_link_libraries(${LIB_FREERTOS_NAME} PRIVATE
+        ${FREERTOS_ADDITIONAL_LIBS}
+    )
+endif()
+
+####################################################################################################
+# Flags and defines
+####################################################################################################
+
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    if(FREERTOS_CREATE_GCC_SECTIONS)
+        target_compile_options(${LIB_FREERTOS_NAME} PRIVATE
+            ${FREERTOS_WARNING_FLAGS}
+        )
+        
+        # Create sections for a GCC compiler
+        target_compile_options(${LIB_FREERTOS_NAME} PRIVATE
+            "-ffunction-sections"
+            "-fdata-sections"
+        )
+        
+        if(FREERTOS_REMOVE_UNUSED_CODE)
+            target_link_options(${LIB_FREERTOS_NAME} PRIVATE
+                "-Wl,--gc-sections"
+            )
+        endif()
+    endif()
+endif()
+