cmake: Add toolchain file for cross-compiling.

Makefile.cmake

@@ -2,12 +2,13 @@ BUILD?=build
 VERBOSE?=0
 PARALLEL_JOBS?=1
 CMAKE?=cmake
+TOOLCHAIN_FILE=#./cmake/codesourcery-arm-toolchain.cmake
 
-all: doc package
+all: package
 
 $(BUILD)/Makefile:
 	mkdir $(BUILD) || exit 0
-	cd $(BUILD) && $(CMAKE) -DCMAKE_VERBOSE_MAKEFILE=$(VERBOSE) ..
+	cd $(BUILD) && $(CMAKE) -DCMAKE_VERBOSE_MAKEFILE=$(VERBOSE) -DCMAKE_TOOLCHAIN_FILE=$(TOOLCHAIN_FILE) ..
 
 build: $(BUILD)/Makefile
 	cd $(BUILD) && make -j $(PARALLEL_JOBS)

README.cmake

@@ -38,6 +38,18 @@ To submit valgrind test results:
 
   make -f Makefile.cmake cdash-mem
 
+Cross-compiling:
+  An example toolchain file for the CodeSourcery ARM toolchain is included in
+  the cmake directory: codesourcery-arm-toolchain.cmake.
+
+  Install the CodeSourcery toolchain, set the path to the toolchain in
+  cmake/codesourcery-arm-toolchain.cmake, and uncomment the TOOLCHAIN_FILE
+  variable in Makefile.cmake to use it.
+
+  If you are using cmake directly, just add the flag
+  "-DCMAKE_TOOLCHAIN_FILE=/path/to/toolchain-file" when
+  running cmake.
+
 Using cmake directly:
   cd ~/your-node-source-dir
   mkdir name-of-build-dir     (can be anything)

cmake/codesourcery-arm-toolchain.cmake

@@ -0,0 +1,22 @@
+set(toolchain_dir #SET THIS TO YOUR TOOLCHAIN PATH)
+set(toolchain_bin_dir ${toolchain_dir}/bin)
+set(toolchain_libc_dir ${toolchain_dir}/arm-none-linux-gnueabi/libc)
+set(toolchain_inc_dir ${toolchain_libc_dir}/include)
+set(toolchain_lib_dir ${toolchain_libc_dir}/usr/lib)
+
+set(CMAKE_SYSTEM_NAME Linux CACHE INTERNAL "system name")
+set(CMAKE_SYSTEM_PROCESSOR arm CACHE INTERNAL "processor")
+set(CMAKE_C_COMPILER ${toolchain_bin_dir}/arm-none-linux-gnueabi-gcc)
+set(CMAKE_CXX_COMPILER ${toolchain_bin_dir}/arm-none-linux-gnueabi-g++)
+set(CMAKE_C_FLAGS "-isystem ${toolchain_inc_dir}" CACHE INTERNAL "c compiler flags")
+set(CMAKE_CXX_FLAGS "-isystem ${toolchain_inc_dir}" CACHE INTERNAL "cxx compiler flags")
+
+set(link_flags -L${toolchain_lib_dir})
+
+set(CMAKE_EXE_LINKER_FLAGS ${link_flags} CACHE INTERNAL "exe link flags")
+set(CMAKE_MODULE_LINKER_FLAGS ${link_flags} CACHE INTERNAL "module link flags")
+set(CMAKE_SHARED_LINKER_FLAGS ${link_flags} CACHE INTERNAL "shared lnk flags")
+set(CMAKE_FIND_ROOT_PATH ${toolchain_libc_dir} CACHE INTERNAL "cross root directory")
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH CACHE INTERNAL "")
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY CACHE INTERNAL "")
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY CACHE INTERNAL "")

cmake/v8_build.cmake

@@ -38,6 +38,7 @@ if(NOT SHARED_V8)
   set_property(TARGET v8
     PROPERTY IMPORTED_LOCATION ${PROJECT_BINARY_DIR}/deps/v8/${v8_fn})
 
+  set(compile_env_vars  "CC=${CMAKE_C_COMPILER} CXX=${CMAKE_CXX_COMPILER} AR=${CMAKE_AR} RANLIB=${CMAKE_RANLIB} CFLAGS=\"${CMAKE_C_FLAGS}\" CXXFLAGS=\"${CMAKE_CXX_FLAGS}\" LDFLAGS=\"${CMAKE_EXE_LINKER_FLAGS}\"")
 
   if(CMAKE_VERSION VERSION_GREATER 2.8 OR CMAKE_VERSION VERSION_EQUAL 2.8)
     # use ExternalProject for CMake >2.8
@@ -47,7 +48,7 @@ if(NOT SHARED_V8)
       URL ${PROJECT_SOURCE_DIR}/deps/v8
 
       BUILD_IN_SOURCE True
-      BUILD_COMMAND ${PYTHON_EXECUTABLE} ${PROJECT_BINARY_DIR}/tools/scons/scons.py library=static visibility=default ${v8snapshot} mode=${v8mode} verbose=on arch=${v8arch} -j ${parallel_jobs}
+      BUILD_COMMAND sh -c "${compile_env_vars} ${PYTHON_EXECUTABLE} ${PROJECT_BINARY_DIR}/tools/scons/scons.py library=static visibility=default ${v8snapshot} mode=${v8mode} verbose=on arch=${v8arch} -j ${parallel_jobs}"
 
       SOURCE_DIR ${PROJECT_BINARY_DIR}/deps/v8
       # ignore this stuff, it's not needed for building v8 but ExternalProject
@@ -78,7 +79,7 @@ if(NOT SHARED_V8)
 
     add_custom_command(
       OUTPUT ${PROJECT_BINARY_DIR}/deps/v8/${v8_fn}
-      COMMAND ${PYTHON_EXECUTABLE} ${PROJECT_BINARY_DIR}/tools/scons/scons.py library=static visibility=default ${v8snapshot} mode=${v8mode} verbose=on arch=${v8arch} -j ${parallel_jobs}
+      COMMAND sh -c "${compile_env_vars} ${PYTHON_EXECUTABLE} ${PROJECT_BINARY_DIR}/tools/scons/scons.py library=static visibility=default ${v8snapshot} mode=${v8mode} verbose=on arch=${v8arch} -j ${parallel_jobs}"
       WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/deps/v8/
       DEPENDS ${v8_sources_dest}
     )