Add CloudABI toolchain files for easy compilation with CMake.

Author: sgielen

cmake/Toolchain-cloudabi-common.cmake

@@ -0,0 +1,4 @@
+set(CMAKE_C_COMPILER ${CLOUDABI_TRIPLET}-cc)
+set(CMAKE_CXX_COMPILER ${CLOUDABI_TRIPLET}-c++)
+set(CMAKE_AR ${CLOUDABI_TRIPLET}-ar CACHE FILEPATH "Archiver")
+set(CMAKE_RANLIB ${CLOUDABI_TRIPLET}-ranlib CACHE FILEPATH "Ranlib")

cmake/Toolchain-i686-cloudabi.cmake

@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.6.0)
+SET(CMAKE_SYSTEM_NAME Generic)
+
+set(CLOUDABI_TRIPLET i686-unknown-cloudabi)
+include(${CMAKE_CURRENT_LIST_DIR}/Toolchain-cloudabi-common.cmake)
+
+# Work-around for clang r264966
+if(NOT CLOUDABI_NO_X86_CALL_FRAME_SET)
+	set(CLOUDABI_NO_X86_CALL_FRAME_SET 1)
+	set(CMAKE_C_FLAGS_INIT "${CMAKE_C_FLAGS_INIT} -mllvm -no-x86-call-frame-opt")
+	set(CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS_INIT} -mllvm -no-x86-call-frame-opt")
+endif()

cmake/Toolchain-x86_64-cloudabi.cmake

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.6.0)
+SET(CMAKE_SYSTEM_NAME Generic)
+
+set(CLOUDABI_TRIPLET x86_64-unknown-cloudabi)
+include(${CMAKE_CURRENT_LIST_DIR}/Toolchain-cloudabi-common.cmake)