Cross-build OpenSSL for WebAssembly

Author: kateinoigakukun

Rakefile

@@ -18,7 +18,7 @@ BUILD_SOURCES = {
 }
 
 FULL_EXTS =
-  "bigdecimal,cgi/escape,continuation,coverage,date,dbm,digest/bubblebabble,digest,digest/md5,digest/rmd160,digest/sha1,digest/sha2,etc,fcntl,fiber,gdbm,json,json/generator,json/parser,nkf,objspace,pathname,psych,racc/cparse,rbconfig/sizeof,ripper,stringio,strscan,monitor,zlib"
+  "bigdecimal,cgi/escape,continuation,coverage,date,dbm,digest/bubblebabble,digest,digest/md5,digest/rmd160,digest/sha1,digest/sha2,etc,fcntl,fiber,gdbm,json,json/generator,json/parser,nkf,objspace,pathname,psych,racc/cparse,rbconfig/sizeof,ripper,stringio,strscan,monitor,zlib,openssl"
 
 BUILD_PROFILES = {
   "minimal" => {

lib/ruby_wasm/build_system/product.rb

@@ -3,5 +3,6 @@
 require_relative "product/baseruby"
 require_relative "product/zlib"
 require_relative "product/libyaml"
+require_relative "product/openssl"
 require_relative "product/wasi_vfs"
 require_relative "product/crossruby"

lib/ruby_wasm/build_system/product/crossruby.rb

@@ -131,7 +131,7 @@ def build(remake: false, reconfigure: false)
       FileUtils.mkdir_p dest_dir
       FileUtils.mkdir_p build_dir
       @toolchain.install
-      [@source, @baseruby, @libyaml, @zlib, @wasi_vfs].each(&:build)
+      [@source, @baseruby, @libyaml, @zlib, @openssl, @wasi_vfs].each(&:build)
       dep_tasks.each(&:invoke)
       configure(reconfigure: reconfigure)
       build_exts
@@ -178,6 +178,10 @@ def with_wasi_vfs(wasi_vfs)
       @wasi_vfs = wasi_vfs
     end
 
+    def with_openssl(openssl)
+      @openssl = openssl
+    end
+
     def dest_dir
       File.join(@rubies_dir, name)
     end
@@ -215,6 +219,7 @@ def configure_args(build_triple, toolchain)
       args << %Q(--with-ext="#{default_exts}")
       args << %Q(--with-libyaml-dir="#{@libyaml.install_root}")
       args << %Q(--with-zlib-dir="#{@zlib.install_root}")
+      args << %Q(--with-openssl-dir="#{@openssl.install_root}") if @openssl
       args << %Q(--with-baseruby="#{baseruby_path}")
 
       case target

lib/ruby_wasm/build_system/product/openssl.rb

@@ -0,0 +1,70 @@
+require "rake"
+require_relative "./product"
+
+module RubyWasm
+  class OpenSSLProduct < AutoconfProduct
+    attr_reader :target, :install_task
+
+    OPENSSL_VERSION = "3.0.5"
+
+    def initialize(build_dir, target, toolchain)
+      @build_dir = build_dir
+      @target = target
+      super(target, toolchain)
+    end
+
+    def product_build_dir
+      File.join(@build_dir, target, "openssl-#{OPENSSL_VERSION}")
+    end
+
+    def destdir
+      File.join(product_build_dir, "opt")
+    end
+
+    def install_root
+      File.join(destdir, "usr", "local")
+    end
+
+    def name
+      product_build_dir
+    end
+
+    def configure_args
+      args = %w[
+        -static
+        -no-asm
+        -no-threads
+        -no-afalgeng
+        -no-ui-console
+        -no-tests
+        -no-sock
+        -no-dgram
+        --libdir=lib
+        -DNO_SYSLOG
+        -Wl,--allow-undefined
+      ]
+      if @target == "wasm32-unknown-wasi"
+        args.concat %w[
+                      -D_WASI_EMULATED_SIGNAL
+                      -D_WASI_EMULATED_PROCESS_CLOCKS
+                      -D_WASI_EMULATED_MMAN
+                    ]
+      end
+      args + tools_args
+    end
+
+    def build
+      return if Dir.exist?(install_root)
+
+      FileUtils.mkdir_p File.dirname(product_build_dir)
+      FileUtils.rm_rf product_build_dir
+      system "curl -L https://www.openssl.org/source/openssl-#{OPENSSL_VERSION}.tar.gz | tar xz",
+             chdir: File.dirname(product_build_dir)
+
+      system "./Configure #{configure_args.join(" ")}", chdir: product_build_dir
+      # Use "install_sw" instead of "install" because it tries to install docs and it's very slow.
+      # OpenSSL build system doesn't have well support for parallel build, so force -j1.
+      system "make -j1 install_sw DESTDIR=#{destdir}", chdir: product_build_dir
+    end
+  end
+end

lib/ruby_wasm/rake_task.rb

@@ -47,6 +47,7 @@ def initialize(
     @wasi_vfs = RubyWasm::WasiVfsProduct.new(@build_dir)
     @source = RubyWasm::BuildSource.new(src, @build_dir)
     @baseruby = RubyWasm::BaseRubyProduct.new(@build_dir, @source)
+    @openssl = RubyWasm::OpenSSLProduct.new(@build_dir, @target, @toolchain)
 
     build_params =
       RubyWasm::BuildParams.new(options.merge(name: name, target: @target))
@@ -65,6 +66,7 @@ def initialize(
     @crossruby.with_libyaml @libyaml
     @crossruby.with_zlib @zlib
     @crossruby.with_wasi_vfs @wasi_vfs
+    @crossruby.with_openssl @openssl
 
     desc "Cross-build Ruby for #{@target}"
     task name do