Changed to use zig for builds on Windows.

build_config.rb

@@ -89,25 +89,23 @@ def build_config(conf, target = nil, strip: false)
 
 if build_targets.include?('windows-amd64')
   MRuby::CrossBuild.new('windows-amd64') do |conf|
-    toolchain :gcc
-
-    conf.build_target     = 'x86_64-pc-linux-gnu'
-    conf.host_target      = 'x86_64-w64-mingw32'
-
-    [conf.cc, conf.linker].each do |cc|
-      cc.command = "#{ccache}#{conf.host_target}-gcc-posix"
-      cc.flags << '-static'
-    end
-    conf.cc.defines      += %w[MRB_STR_LENGTH_MAX=0 MRB_UTF8_STRING MRUBY_YAML_NO_CANONICAL_NULL]
-    conf.cxx.command      = "#{ccache}#{conf.host_target}-g++"
-    conf.archiver.command = "#{ccache}#{conf.host_target}-gcc-ar"
+    build_config(conf, 'x86_64-windows', strip: true)
+    conf.cc.flags << '-lws2_32'
+    conf.linker.flags << '-lws2_32'
 
     conf.exts do |exts|
       exts.object = '.obj'
       exts.executable = '.exe'
       exts.library = '.lib'
     end
 
+    crossbuild_root = File.join(build_dir, 'crossbuild')
+    FileUtils.mkdir_p(crossbuild_root)
+    crossbuild_lib_path = File.join(crossbuild_root, 'gai_strerror.o')
+    crossbuild_src_path = File.join(__dir__, 'crossbuild', 'gai_strerror.c')
+    `#{conf.cc.command} #{conf.cc.flags.join(' ')} -o #{crossbuild_lib_path} -c #{crossbuild_src_path}`
+    conf.linker.flags << crossbuild_lib_path
+
     debug_config(conf)
     gem_config(conf)
   end

crossbuild/gai_strerror.c

@@ -0,0 +1,41 @@
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#ifndef UNICODE
+char* gai_strerrorA(int errcode)
+{
+    static char buf[GAI_STRERROR_BUFFER_SIZE + 1];
+
+    FormatMessageA(
+        FORMAT_MESSAGE_FROM_SYSTEM
+            | FORMAT_MESSAGE_IGNORE_INSERTS
+            | FORMAT_MESSAGE_MAX_WIDTH_MASK,
+        NULL,
+        errcode,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        buf, GAI_STRERROR_BUFFER_SIZE + 1,
+        NULL);
+
+    return buf;
+}
+
+#else
+
+WCHAR* gai_strerrorW(int errcode)
+{
+    static WCHAR buf[GAI_STRERROR_BUFFER_SIZE + 1];
+
+    FormatMessageW(
+        FORMAT_MESSAGE_FROM_SYSTEM
+            | FORMAT_MESSAGE_IGNORE_INSERTS
+            | FORMAT_MESSAGE_MAX_WIDTH_MASK,
+        NULL,
+        errcode,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        buf, GAI_STRERROR_BUFFER_SIZE + 1,
+        NULL);
+
+    return buf;
+}
+
+#endif