From d68a7ac6dd5a50a6c3ad60188fef435194e0e6ba Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Wed, 13 May 2020 10:18:45 -0700
Subject: [PATCH] libbacktrace: treat EACCESS like ENOENT

For https://gcc.gnu.org/PR95061
---
 posix.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/posix.c b/posix.c
index 356e72b..a2c88dd 100644
--- a/posix.c
+++ b/posix.c
@@ -67,7 +67,11 @@ backtrace_open (const char *filename, backtrace_error_callback error_callback,
   descriptor = open (filename, (int) (O_RDONLY | O_BINARY | O_CLOEXEC));
   if (descriptor < 0)
     {
-      if (does_not_exist != NULL && errno == ENOENT)
+      /* If DOES_NOT_EXIST is not NULL, then don't call ERROR_CALLBACK
+	 if the file does not exist.  We treat lacking permission to
+	 open the file as the file not existing; this case arises when
+	 running the libgo syscall package tests as root.  */
+      if (does_not_exist != NULL && (errno == ENOENT || errno == EACCES))
 	*does_not_exist = 1;
       else
 	error_callback (data, filename, errno);