build: Allow to exclude libwasi_vfs.a from link

Author: kateinoigakukun

lib/ruby_wasm/build.rb

@@ -36,6 +36,7 @@ def initialize(
     toolchain:,
     build_dir:,
     rubies_dir:,
+    wasi_vfs: :default,
     **options
   )
     @target = target
@@ -45,7 +46,7 @@ def initialize(
 
     @libyaml = RubyWasm::LibYAMLProduct.new(@build_dir, @target, @toolchain)
     @zlib = RubyWasm::ZlibProduct.new(@build_dir, @target, @toolchain)
-    @wasi_vfs = RubyWasm::WasiVfsProduct.new(@build_dir)
+    @wasi_vfs = wasi_vfs == :default ? RubyWasm::WasiVfsProduct.new(@build_dir) : wasi_vfs
     @source = RubyWasm::BuildSource.new(src, @build_dir)
     @baseruby = RubyWasm::BaseRubyProduct.new(@build_dir, @source)
     @openssl = RubyWasm::OpenSSLProduct.new(@build_dir, @target, @toolchain)
@@ -83,6 +84,8 @@ def cache_key(digest)
     digest << @libyaml.name
     digest << @zlib.name
     digest << @openssl.name
-    digest << @wasi_vfs.name
+    if wasi_vfs = @wasi_vfs
+      digest << wasi_vfs.name
+    end
   end
 end

lib/ruby_wasm/build/product/crossruby.rb

@@ -169,6 +169,7 @@ def build(executor, remake: false, reconfigure: false)
       executor.mkdir_p build_dir
       @toolchain.install
       [@source, @baseruby, @libyaml, @zlib, @openssl, @wasi_vfs].each do |prod|
+        next unless prod
         executor.begin_section prod.class, prod.name, "Building"
         prod.build(executor)
         executor.end_section prod.class, prod.name

sig/ruby_wasm/build.rbs

@@ -15,7 +15,7 @@ module RubyWasm
     @libyaml: LibYAMLProduct
     @zlib: ZlibProduct
     @openssl: OpenSSLProduct
-    @wasi_vfs: WasiVfsProduct
+    @wasi_vfs: WasiVfsProduct?
     @baseruby: BaseRubyProduct
     @crossruby: CrossRubyProduct
     @source: BuildSource
@@ -29,6 +29,7 @@ module RubyWasm
       toolchain: Toolchain?,
       build_dir: string,
       rubies_dir: string,
+      ?wasi_vfs: :default | WasiVfsProduct?,
       **untyped
     ) -> void
     def crossruby: () -> CrossRubyProduct
@@ -192,7 +193,7 @@ module RubyWasm
     def ext_build_dir: -> String
     def with_libyaml: (LibYAMLProduct libyaml) -> LibYAMLProduct
     def with_zlib: (ZlibProduct zlib) -> ZlibProduct
-    def with_wasi_vfs: (WasiVfsProduct wasi_vfs) -> WasiVfsProduct
+    def with_wasi_vfs: (WasiVfsProduct? wasi_vfs) -> WasiVfsProduct?
     def with_openssl: (OpenSSLProduct openssl) -> OpenSSLProduct
     def dest_dir: -> String
     def artifact: -> String