cmake git ver depend on index and HEAD

CMakeLists.txt

@@ -117,22 +117,18 @@
 #
 #=============================================================================
 
-if("${CMAKE_VERSION}" VERSION_LESS 2.8.0)
+if("${CMAKE_VERSION}" VERSION_LESS 3.1.0)
 	message("Not a valid CMake version")
-	message("On Ubuntu 16.04, install or upgrade via:")
+	message("On Ubuntu >= 16.04, install or upgrade via:")
 	message("	sudo apt-get install cmake")
 	message("")
-	message("Official website:")
-	message("	wget https://cmake.org/files/v3.4/cmake-3.4.3-Linux-x86_64.sh")
-	message("	chmod +x cmake-3.4.3-Linux-x86_64.sh")
-	message("	sudo mkdir /opt/cmake-3.4.3")
-	message("	sudo ./cmake-3.4.3-Linux-x86_64.sh --prefix=/opt/cmake-3.4.3 --exclude-subdir")
-	message("	export PATH=/opt/cmake-3.4.3/bin:$$PATH")
+	message("Official website: https://cmake.org/download/")
+	message(FATAL_ERROR "Update CMake and try again" )
 endif()
 
 # Warning: Changing this modifies CMake's internal workings
 # and leads to wrong toolchain detection
-cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
 
 set(PX4_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
 set(PX4_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")
@@ -150,10 +146,11 @@ set(CMAKE_BUILD_TYPE "" CACHE STRING "build type")
 set_property(CACHE CMAKE_BUILD_TYPE PROPERTY
 	STRINGS ";Debug;Release;RelWithDebInfo;MinSizeRel")
 set(CONFIG "posix_sitl_default" CACHE STRING "desired configuration")
+
 file(GLOB_RECURSE configs RELATIVE cmake/configs "cmake/configs/*.cmake")
 set_property(CACHE CONFIG PROPERTY STRINGS ${configs})
-set(THREADS "4" CACHE STRING
-	"number of threads to use for external build processes")
+
+set(THREADS "4" CACHE STRING "number of threads to use for external build processes")
 set(DEBUG_PORT "/dev/ttyACM0" CACHE STRING "debugging port")
 set(EXTERNAL_MODULES_LOCATION "" CACHE STRING "External modules source location")
 
@@ -247,14 +244,6 @@ set(BUILD_SHARED_LIBS OFF)
 # project definition
 #
 project(px4 CXX C ASM)
-if (NOT ${CMAKE_VERSION} VERSION_LESS 3.0.0)
-	cmake_policy(SET CMP0045 NEW) # error on non-existent target in get prop
-	cmake_policy(SET CMP0046 NEW) # no non-existent targets as dependencies
-	cmake_policy(SET CMP0025 OLD) # still report AppleClang as Clang
-endif()
-if (NOT ${CMAKE_VERSION} VERSION_LESS 3.1.0)
-	cmake_policy(SET CMP0054 NEW) # don't dereference quoted variables
-endif()
 
 set(package-contact "px4users@googlegroups.com")
 
@@ -289,6 +278,15 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 #=============================================================================
 # check required toolchain variables
 #
+
+# PX4 requires c++11
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# PX4 requires c99
+set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
 set(required_variables
 	CMAKE_C_COMPILER_ID
 	)
@@ -495,7 +493,7 @@ endif()
 #=============================================================================
 # generate git version
 #
-px4_create_git_hash_header(OUT ${PX4_BINARY_DIR}/build_git_version.h)
+px4_create_git_hash_header()
 
 #=============================================================================
 # packaging

cmake/common/px4_base.cmake

@@ -826,14 +826,14 @@ function(px4_add_common_flags)
 		-g
 		-fno-exceptions
 		-fno-rtti
-		-std=gnu++0x
+		-std=gnu++11
 		-fno-threadsafe-statics
 		-DCONFIG_WCHAR_BUILTIN
 		-D__CUSTOM_FILE_IO__
 		)
 
-	# clang
-	if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+	# regular Clang or AppleClang
+	if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 		# force color for clang (needed for clang + ccache)
 		list(APPEND _optimization_flags
 			-fcolor-diagnostics
@@ -973,29 +973,27 @@ endfunction()
 #	Create a header file containing the git hash of the current tree
 #
 #	Usage:
-#		px4_create_git_hash_header(HEADER ${CMAKE_BUILD_DIR}/git_hash.h)
-#
-#	Input:
-#		HEADER 		: path of the header file to generate
+#		px4_create_git_hash_header()
 #
 #	Example:
-#		px4_create_git_hash_header(HEADER ${CMAKE_BUILD_DIR}/git_hash.h)
+#		px4_create_git_hash_header()
 #
 function(px4_create_git_hash_header)
 	px4_parse_function_args(
 		NAME px4_create_git_hash_header
-		ONE_VALUE OUT
-		REQUIRED OUT
 		ARGN ${ARGN})
-	file(WRITE ${OUT} "")
+
+	set(px4_git_ver_header ${PX4_BINARY_DIR}/build_git_version.h)
+
 	add_custom_command(
-		OUTPUT __fake
-		COMMAND ${PYTHON_EXECUTABLE} ${PX4_SOURCE_DIR}/Tools/px_update_git_header.py ${OUT} > ${PX4_BINARY_DIR}/git_header.log
+		OUTPUT ${px4_git_ver_header}
+		COMMAND ${PYTHON_EXECUTABLE} ${PX4_SOURCE_DIR}/Tools/px_update_git_header.py ${px4_git_ver_header} > ${PX4_BINARY_DIR}/git_header.log
+		DEPENDS ${PX4_SOURCE_DIR}/Tools/px_update_git_header.py ${PX4_SOURCE_DIR}/.git/index ${PX4_SOURCE_DIR}/.git/HEAD
 		WORKING_DIRECTORY ${PX4_SOURCE_DIR}
 		COMMENT "Generating git hash header"
 		)
-	add_custom_target(ver_gen ALL
-		DEPENDS ${OUT} __fake)
+	set_source_files_properties(${px4_git_ver_header} PROPERTIES GENERATED TRUE)
+	add_custom_target(ver_gen ALL DEPENDS ${px4_git_ver_header})
 endfunction()
 
 #=============================================================================

unittests/CMakeLists.txt

@@ -1,9 +1,9 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.1)
 
-if("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
+if("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
 	add_compile_options(-Qunused-arguments )
 endif()
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
 	add_compile_options(-Qunused-arguments)
 endif()