Cross Compilation features

README.md

@@ -100,6 +100,8 @@ Then,
           --msi                        Generates a .msi installer for Windows
           --pkg                        Generates a .pkg installer for macOS
           --debug                      Enable debug mode
+      -o, --dest-os=OS                 Destination operating system (enum: win mac solaris freebsd openbsd linux android aix)
+      -a, --dest-arch=ARCH             Destination CPU architecture (enum: arm arm64 ia32 mips mipsel ppc ppc64 x32 x64 x86 s390 s390x)
           --quiet                      Enable quiet mode
       -v, --version                    Prints the version of nodec and exit
       -V, --node-version               Prints the version of the Node.js runtime and exit
@@ -147,6 +149,59 @@ Note: To compile to 32-bit windows OS compatible programs on a 64-bit machine, y
 | [asar](https://github.com/electron/asar) | Asar keeps the code archive and the executable separate while Node.js Packer links all JavaScript source code together with the Node.js virtual machine and generates a single executable as the final product. Asar uses JSON to store files' information while Node.js Packer uses SquashFS.                                                      |
 | [AppImage](http://appimage.org/)         | AppImage supports only Linux with a kernel that supports SquashFS, while Node.js Packer supports all three platforms of Linux, macOS and Windows, meanwhile without any special feature requirements from the kernel.                                                                                                                                 |
 
+## Cross Compilation
+
+`nodec` also support cross-compilation. Since node.js is built from sources you will need to setup properly a toolchain in order
+to get valid compilers to produce binaries for the destination platform.
+
+You can easily do this with by using [crosstool-ng](https://github.com/crosstool-ng/crosstool-ng) or any other tool you like.
+
+Once you're done with the build of a valid toolchain (don't forget to enable c++ if you use crosstool-ng which by default excludes it)
+you will be able to compile properly. Just set-up your environment so that it will know to use your cross-compile toolchain rather than
+your system's default build tools.
+
+An example (you may need to adjust values or specify additional variables):
+
+
+    export AR="x86_64-unknown-linux-gnu-ar"
+    export CC="x86_64-unknown-linux-gnu-gcc"
+    export CXX="x86_64-unknown-linux-gnu-g++"
+    export LINK="x86_64-unknown-linux-gnu-g++"
+    export CPP="x86_64-unknown-linux-gnu-gcc -E"
+    export LD="x86_64-unknown-linux-gnu-ld"
+    export AS="x86_64-unknown-linux-gnu-as"
+    export CCLD="ax86_64-unknown-linux-gnu-gcc ${TARGET_ARCH}"
+    export NM="x86_64-unknown-linux-gnu-nm"
+    export STRIP="x86_64-unknown-linux-gnu-strip"
+    export OBJCOPY="x86_64-unknown-linux-gnu-objcopy"
+    export RANLIB="x86_64-unknown-linux-gnu-ranlib"
+    export F77="x86_64-unknown-linux-gnu-g77 ${TARGET_ARCH}"
+    unset LIBC
+
+    #Define flags
+    #export CXXFLAGS="-march=armv7-a"
+    export LDFLAGS="-L${CSTOOLS_LIB} -Wl,-rpath-link,${CSTOOLS_LIB} -Wl,-O1 -Wl,--hash-style=gnu"
+    export CFLAGS="-isystem${CSTOOLS_INC} -fexpensive-optimizations -frename-registers -fomit-frame-pointer -O2 -ggdb3"
+    export CPPFLAGS="-isystem${CSTOOLS_INC}"
+    # export CCFLAGS="-march=armv7-a"
+
+    #Tools
+    export CSTOOLS=/Volumes/crosstools/x86_64-unknown-linux-gnu
+    export CSTOOLS_INC=${CSTOOLS}/include
+    export CSTOOLS_LIB=${CSTOOLS}/lib
+    #export ARM_TARGET_LIB=$CSTOOLS_LIB
+    # export GYP_DEFINES="armv7=1"
+
+    #Define other things, those are not 'must' to have defined but we added
+    export SHELL="/bin/bash"
+    export TERM="screen"
+    export LANG="en_US.UTF-8"
+    export MAKE="make"
+
+    #Export the path for your system
+    #export HOME="/home/gioyik" #Change this one with the name of your user directory
+    export PATH=${CSTOOLS}/bin:/usr/arm-linux-gnueabi/bin/:$PATH
+
 ## To-do
 
 - Eliminate dependending on an outside Node.js and npm when compiling

bin/nodec

@@ -10,6 +10,13 @@ $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 require "compiler"
 require 'optparse'
 
+# took directly from https://github.com/nodejs/node/blob/master/configure#L47,L50
+VALID_OS = ['win', 'mac', 'solaris', 'freebsd', 'openbsd', 'linux', 'android', 'aix']
+VALID_CPU = [
+  'arm', 'arm64', 'ia32', 'mips', 'mipsel', 'ppc', 'ppc64', 'x32', 'x64', 'x86',
+  's390', 's390x'
+]
+
 USAGE = %Q{
 
 Node.js Compiler (nodec) v#{::Compiler::VERSION}
@@ -124,6 +131,24 @@ OptionParser.new do |opts|
     options[:debug] = true
   end
 
+  opts.on('-osOS', "--dest-os=OS", "Destination operating system (enum: #{VALID_OS.join(' ')})") do |os|
+    unless VALID_OS.include? os
+      puts "Invalid destination (got: --dest-os=#{os}), pick one of: #{VALID_OS.join(' ')}"
+      exit 1
+    end
+
+    options[:os] = os
+  end
+
+  opts.on('-archARCH', "--dest-arch=ARCH", "Destination CPU architecture (enum: #{VALID_CPU.join(' ')})") do |arch|
+    unless VALID_CPU.include? arch
+      puts "Invalid destination (got: --dest-arch=#{arch}), pick one of: #{VALID_CPU.join(' ')}"
+      exit 1
+    end
+
+    options[:arch] = arch
+  end
+
   opts.on("--quiet", "Enable quiet mode") do
     options[:quiet] = true
   end

lib/compiler.rb

@@ -388,6 +388,9 @@ def make_enclose_io_vars
 
   def compile_win
     @utils.chdir(@tmpdir_node) do
+      # --without-intl=none fixes: icutrim.py - it tries to run a binary made for linux on mac
+      # --cross-compiling is required require host executables rather than target ones
+      # --without-snapshot avoids mksnapshot to run on host platform after build
       @utils.run("call vcbuild.bat #{@options[:debug] ? 'debug' : ''} #{@options[:vcbuild_args]}")
     end
     src = File.join(@tmpdir_node, (@options[:debug] ? 'Debug\\node.exe' : 'Release\\node.exe'))
@@ -396,7 +399,10 @@ def compile_win
 
   def compile_mac
     @utils.chdir(@tmpdir_node) do
-      @utils.run("./configure #{@options[:debug] ? '--debug --xcode' : ''}")
+      # --without-intl=none fixes: icutrim.py - it tries to run a binary made for linux on mac
+      # --cross-compiling is required require host executables rather than target ones
+      # --without-snapshot avoids mksnapshot to run on host platform after build
+      @utils.run("./configure #{@options[:debug] ? '--debug --xcode' : ''} #{@options[:os] ? '--cross-compiling --without-snapshot  --with-intl=none': ''} #{@options[:os] ? '--dest-os=' + @options[:os]: ''} #{@options[:arch] ? '--dest-cpu=' + @options[:arch]: ''}")
       @utils.run("make #{@options[:make_args]}")
     end
     if @options[:pkg]
@@ -418,7 +424,10 @@ def compile_mac
 
   def compile_linux
     @utils.chdir(@tmpdir_node) do
-      @utils.run("./configure #{@options[:debug] ? '--debug' : ''}")
+      # --without-intl=none fixes: icutrim.py - it tries to run a binary made for linux on mac
+      # --cross-compiling is required require host executables rather than target ones
+      # --without-snapshot avoids mksnapshot to run on host platform after build
+      @utils.run("./configure #{@options[:debug] ? '--debug' : ''} #{@options[:os] ? '--cross-compiling --without-snapshot  --with-intl=none': ''} #{@options[:os] ? '--dest-os=' + @options[:os]: ''} #{@options[:arch] ? '--dest-cpu=' + @options[:arch]: ''}")
       @utils.run("make #{@options[:make_args]}")
     end
     src = File.join(@tmpdir_node, "out/#{@options[:debug] ? 'Debug' : 'Release'}/node")