move cmake version check into cmake

CMakeLists.txt

@@ -117,6 +117,19 @@
 #
 #=============================================================================
 
+if("${CMAKE_VERSION}" VERSION_LESS 2.8.0)
+	message("Not a valid CMake version")
+	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")
+endif()
+
 # Warning: Changing this modifies CMake's internal workings
 # and leads to wrong toolchain detection
 cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
@@ -129,10 +142,6 @@ execute_process(
 	WORKING_DIRECTORY ${PX4_SOURCE_DIR}
 	)
 
-# Use clang
-#SET (CMAKE_C_COMPILER /usr/bin/clang-3.6)
-#SET (CMAKE_CXX_COMPILER /usr/bin/clang++-3.6)
-
 #=============================================================================
 # parameters
 #

Makefile

@@ -39,26 +39,6 @@ ifeq ($(wildcard .git),)
     $(error YOU HAVE TO USE GIT TO DOWNLOAD THIS REPOSITORY. ABORTING.)
 endif
 
-CMAKE_VER := $(shell Tools/check_cmake.sh; echo $$?)
-ifneq ($(CMAKE_VER),0)
-    $(warning Not a valid CMake version or CMake not installed.)
-    $(warning On Ubuntu 16.04, install or upgrade via:)
-    $(warning )
-    $(warning 3rd party PPA:)
-    $(warning sudo add-apt-repository ppa:george-edison55/cmake-3.x -y)
-    $(warning sudo apt-get update)
-    $(warning sudo apt-get install cmake)
-    $(warning )
-    $(warning Official website:)
-    $(warning wget https://cmake.org/files/v3.4/cmake-3.4.3-Linux-x86_64.sh)
-    $(warning chmod +x cmake-3.4.3-Linux-x86_64.sh)
-    $(warning sudo mkdir /opt/cmake-3.4.3)
-    $(warning sudo ./cmake-3.4.3-Linux-x86_64.sh --prefix=/opt/cmake-3.4.3 --exclude-subdir)
-    $(warning export PATH=/opt/cmake-3.4.3/bin:$$PATH)
-    $(warning )
-    $(error Fatal)
-endif
-
 # Help
 # --------------------------------------------------------------------
 # Don't be afraid of this makefile, it is just passing

Tools/check_cmake.sh

@@ -1,14 +0,0 @@
-#!/bin/bash
-cmake_ver=`cmake --version`
-
-if [[ $cmake_ver == "" ]]
-then
-  exit 1;
-fi
-
-if [[ $cmake_ver == *" 2.8"* ]] || [[ $cmake_ver == *" 2.9"* ]] || [[ $cmake_ver == *" 3.0"* ]] || [[ $cmake_ver == *" 3.1"* ]]
-then
-  exit 1;
-fi
-
-exit 0;