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[newlib-cygwin] Cygwin: Don't print FAST_CWD warning in WOW64 on ARM64 systems


https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a4f1f59bc7821cb115e5f42270aacfe3173c14d2

commit a4f1f59bc7821cb115e5f42270aacfe3173c14d2
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Jul 10 14:45:52 2018 +0200

    Cygwin: Don't print FAST_CWD warning in WOW64 on ARM64 systems
    
    No way to test this, yet.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/path.cc | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index d56f22e..3936b10 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -4305,11 +4305,25 @@ find_fast_cwd ()
      used on the system. */
   fcwd_access_t **f_cwd_ptr = find_fast_cwd_pointer ();
   if (!f_cwd_ptr)
-    small_printf ("Cygwin WARNING:\n"
+    {
+#ifndef __x86_64__
+#ifndef PROCESSOR_ARCHITECTURE_ARM64
+#define PROCESSOR_ARCHITECTURE_ARM64 12
+#endif
+      SYSTEM_INFO si;
+
+      /* Check if we're running in WOW64 on ARM64.  Skip the warning as long as
+	 there's no solution for finding the FAST_CWD pointer on that system. */
+      if (wincap.is_wow64 ()
+	  && (GetNativeSystemInfo (&si),
+	      si.wProcessorArchitecture != PROCESSOR_ARCHITECTURE_ARM64))
+#endif
+      small_printf ("Cygwin WARNING:\n"
 "  Couldn't compute FAST_CWD pointer.  This typically occurs if you're using\n"
 "  an older Cygwin version on a newer Windows.  Please update to the latest\n"
 "  available Cygwin version from https://cygwin.com/.  If the problem persists,\n"
 "  please see https://cygwin.com/problems.html\n\n";);
+    }
   if (f_cwd_ptr && *f_cwd_ptr)
     {
       /* Just evaluate structure version. */


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