build(crossruby): always pass host dump_ast

Always pass --with-dump-ast alongside --with-baseruby during cross builds, and remove source capability detection. Keep the configure-args test focused on the unconditional dump_ast wiring.

Author: ledsun

lib/ruby_wasm/build/product/crossruby.rb

@@ -340,7 +340,7 @@ def configure_args(build_triple, toolchain)
       args << %Q(--with-zlib-dir=#{@zlib.install_root})
       args << %Q(--with-openssl-dir=#{@openssl.install_root}) if @openssl
       args << %Q(--with-baseruby=#{baseruby_path})
-      args << %Q(--with-dump-ast=#{dump_ast_path}) if @source.supports_with_dump_ast?
+      args << %Q(--with-dump-ast=#{dump_ast_path})
 
       case target
       when /^wasm32-unknown-wasi/

lib/ruby_wasm/build/product/ruby_source.rb

@@ -33,12 +33,6 @@ def configure_file
       File.join(src_dir, "configure")
     end
 
-    def supports_with_dump_ast?
-      [File.join(src_dir, "configure.ac"), configure_file].any? do |path|
-        File.file?(path) && File.read(path).include?("--with-dump-ast")
-      end
-    end
-
     def fetch(executor)
       case @params[:type]
       when "github"

test/test_crossruby_configure_args.rb

@@ -80,7 +80,7 @@ def test_configure_args_include_dump_ast_when_supported
     end
   end
 
-  def test_configure_args_skip_dump_ast_when_unsupported
+  def test_configure_args_include_dump_ast_even_when_configure_ac_does_not_mention_it
     Dir.mktmpdir do |tmpdir|
       crossruby =
         build_crossruby(
@@ -90,7 +90,7 @@ def test_configure_args_skip_dump_ast_when_unsupported
 
       args = crossruby.configure_args("x86_64-linux-gnu", @toolchain)
 
-      assert_not_include args.grep(/\A--with-dump-ast=/), "--with-dump-ast=/tmp/baseruby/build/dump_ast"
+      assert_include args, "--with-dump-ast=/tmp/baseruby/build/dump_ast"
     end
   end
 end