Remove code for pre OS X 10.5

Author: nobu

configure.ac

@@ -402,7 +402,8 @@ AS_CASE(["$target_os"],
 [darwin*], [
     AC_MSG_CHECKING(if minimum required OS X version is supported)
     AC_PREPROC_IFELSE([AC_LANG_SOURCE([[@%:@include <AvailabilityMacros.h>
-	@%:@if MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_5
+	@%:@if !defined(MAC_OS_X_VERSION_10_5) || \
+	      (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
 	@%:@error pre OS X 10.5
 	[!<===== pre OS X 10.5 =====>]
 	@%:@endif

file.c

@@ -38,6 +38,10 @@
 #   define API_DEPRECATED(...)
 # endif
 # include <CoreFoundation/CFString.h>
+# if !defined(MAC_OS_X_VERSION_10_5) || \
+      (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
+#   error Unsupported OS version required
+# endif
 #endif
 
 #ifdef HAVE_UNISTD_H

signal.c

@@ -816,11 +816,7 @@ check_stack_overflow(int sig, const uintptr_t addr, const ucontext_t *ctx)
 #   endif
 # elif defined __APPLE__
 #   include <AvailabilityMacros.h>
-#   if defined(MAC_OS_X_VERSION_10_5) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
-#     define MCTX_SS_REG(reg) __ss.__##reg
-#   else
-#     define MCTX_SS_REG(reg) ss.reg
-#   endif
+#   define MCTX_SS_REG(reg) __ss.__##reg /* OS X 10.5 or later */
 #   if defined(__LP64__)
     const uintptr_t sp = mctx->MCTX_SS_REG(rsp);
     const uintptr_t bp = mctx->MCTX_SS_REG(rbp);

thread_pthread.c

@@ -42,6 +42,10 @@
 
 #if defined __APPLE__
 # include <AvailabilityMacros.h>
+# if !defined(MAC_OS_X_VERSION_10_5) || \
+      (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
+#   error Unsupported OS version required
+# endif
 #endif
 
 #if defined(HAVE_SYS_EVENTFD_H) && defined(HAVE_EVENTFD)

vm_dump.c

@@ -751,11 +751,7 @@ rb_vmdebug_thread_dump_state(FILE *errout, VALUE self)
 
 #if defined __APPLE__
 # include <AvailabilityMacros.h>
-# if defined(MAC_OS_X_VERSION_10_5) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
-#   define MCTX_SS_REG(reg) __ss.__##reg
-# else
-#   define MCTX_SS_REG(reg) ss.reg
-# endif
+# define MCTX_SS_REG(reg) __ss.__##reg /* OS X 10.5 or later */
 #endif
 
 #if defined(HAVE_BACKTRACE)