1 files changed, 22 insertions, 0 deletions
diff --git a/tool/m4/ruby_mingw32.m4 b/tool/m4/ruby_mingw32.m4
new file mode 100644
index 0000000000..70127e3ea9
--- /dev/null
+++ b/tool/m4/ruby_mingw32.m4
@@ -0,0 +1,22 @@
+AC_DEFUN([RUBY_MINGW32],
+[AS_CASE(["$host_os"],
+[cygwin*], [
+AC_CACHE_CHECK(for mingw32 environment, rb_cv_mingw32,
+[AC_TRY_CPP([
+#ifndef __MINGW32__
+# error
+#endif
+], rb_cv_mingw32=yes,rb_cv_mingw32=no)
+rm -f conftest*])
+AS_IF([test "$rb_cv_mingw32" = yes], [
+    target_os="mingw32"
+    : ${ac_tool_prefix:="`expr "$CC" : ['\(.*-\)g\?cc[^/]*$']`"}
+])
+])
+AS_CASE(["$target_os"], [mingw*msvc], [
+target_os="`echo ${target_os} | sed 's/msvc$//'`"
+])
+AS_CASE(["$target_cpu-$target_os"], [x86_64-mingw*], [
+target_cpu=x64
+])
+])dnl