Fix inaccurate cache key

Author: kateinoigakukun

lib/ruby_wasm/build_system/product/crossruby.rb

@@ -72,6 +72,16 @@ def do_install_rb(crossruby)
       objdir = product_build_dir crossruby
       system %Q(make -C "#{objdir}" #{make_args(crossruby).join(" ")} install-rb)
     end
+
+    def cache_key(digest)
+      digest << @name
+      # Compute hash value of files under srcdir
+      Dir.glob("#{@srcdir}/**/*", File::FNM_DOTMATCH).each do |f|
+        next if File.directory?(f)
+        digest << f
+        digest << File.read(f)
+      end
+    end
   end
 
   class CrossRubyProduct < AutoconfProduct
@@ -158,6 +168,19 @@ def name
       @params.name
     end
 
+    def cache_key(digest)
+      digest << @params.target
+      digest << @params.default_exts
+      @wasmoptflags.each{|f| digest << f }
+      @cppflags.each{|f| digest << f }
+      @cflags.each{|f| digest << f }
+      @ldflags.each{|f| digest << f }
+      @debugflags.each{|f| digest << f }
+      @xcflags.each{|f| digest << f }
+      @xldflags.each{|f| digest << f }
+      @user_exts.each{|ext| ext.cache_key(digest) }
+    end
+
     def build_dir
       File.join(@build_dir, @params.target, name)
     end

lib/ruby_wasm/build_system/product/ruby_source.rb

@@ -11,12 +11,13 @@ def name
       @params[:name]
     end
 
-    def cache_key
+    def cache_key(digest)
+      digest << @params[:type]
       case @params[:type]
       when "github"
-        @params[:rev]
+        digest << @params[:rev]
       when "local"
-        File.mtime(@params[:src]).to_i.to_s
+        digest << File.mtime(@params[:src]).to_i.to_s
       else
         raise "unknown source type: #{@params[:type]}"
       end

lib/ruby_wasm/rake_task.rb

@@ -92,7 +92,8 @@ def initialize(
   def hexdigest
     require "digest"
     digest = Digest::SHA256.new
-    digest << @source.cache_key
+    @source.cache_key(digest)
+    @crossruby.cache_key(digest)
     digest << @build_dir
     digest << @rubies_dir
     digest << @target