setup.mak: -runtime-

* win32/setup.mak (-runtime-): see msvcrt from link header on mswin
  instead of running testing executable file, for cross compiling.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38791 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/rtname.cmd

@@ -0,0 +1,18 @@
+@echo off
+set rt=
+set rtver=
+set osver=
+for /f "usebackq" %%I in (`dumpbin -dependents %1 ^| findstr -r -i "\<msvcr.*\.dll$"`) do set rt=%%~nI
+if "%rt%" == "" (
+    (echo %0: %1 is not linked to msvcrt) 1>&2
+    exit 1
+)
+for %%i in (a b c d e f g h i j k l m n o p q r s t u v w x y z) do @call set rt=%%rt:%%i=%%i%%
+if "%rt%" == "msvcrt" (
+    call set rtver=60
+) else (
+    call set rtver=%%rt:msvcr=%%
+    call set rt=msvcr%%rtver%%
+    call set osver=_%%rtver%%
+)
+for %%I in ("PLATFORM = $(TARGET_OS)%osver%" "RT = %rt%" "RT_VER = %rtver%") do @echo %%~I