Support coroutine on universal binary

configure.ac

@@ -2412,6 +2412,9 @@ AS_CASE([$rb_cv_coroutine], [yes|''], [
     AC_MSG_CHECKING(native coroutine implementation for ${target_cpu}-${target_os})
     rb_cv_coroutine=
     AS_CASE(["$target_cpu-$target_os"],
+        [universal-darwin*], [
+            rb_cv_coroutine=universal
+        ],
         [x*64-darwin*], [
             rb_cv_coroutine=amd64
         ],

coroutine/universal/Context.S

@@ -0,0 +1,12 @@
+#if 0
+#elif defined __x86_64__
+# include "coroutine/amd64/Context.S"
+#elif defined __i386__
+# include "coroutine/x86/Context.S"
+#elif defined __ppc64__
+# include "coroutine/ppc64le/Context.S"
+#elif defined __arm64__
+# include "coroutine/arm64/Context.S"
+#else
+# error "Unsupported CPU"
+#endif

coroutine/universal/Context.h

@@ -0,0 +1,17 @@
+#ifndef COROUTINE_UNIVERSAL_CONTEXT_H
+#define COROUTINE_UNIVERSAL_CONTEXT_H 1
+
+#if 0
+#elif defined __x86_64__
+# include "coroutine/amd64/Context.h"
+#elif defined __i386__
+# include "coroutine/x86/Context.h"
+#elif defined __ppc64__
+# include "coroutine/ppc64le/Context.h"
+#elif defined __arm64__
+# include "coroutine/arm64/Context.h"
+#else
+# error "Unsupported CPU"
+#endif
+
+#endif /* COROUTINE_UNIVERSAL_CONTEXT_H */

template/Makefile.in

@@ -217,7 +217,7 @@ AR            = @AR@
 ARFLAGS       = @ARFLAGS@$(empty)
 RANLIB        = @RANLIB@
 AS            = @AS@
-ASFLAGS       = @ASFLAGS@ $(INCFLAGS)
+ASFLAGS       = @ASFLAGS@ $(ARCH_FLAG) $(INCFLAGS)
 IFCHANGE      = $(tooldir)/ifchange
 OBJDUMP       = @OBJDUMP@
 OBJCOPY       = @OBJCOPY@