Use _REENT_ERRNO() macro to access errno.  This encapsulation is
required, as errno might be either _errno member of struct _reent,
_tls_errno or any such implementation detail.
---
 newlib/libc/locale/locale.c       | 18 +++++++++---------
 newlib/libc/locale/newlocale.c    |  6 +++---
 newlib/libc/stdlib/_mallocr.c     |  2 +-
 newlib/libc/stdlib/nano-mallocr.c |  2 +-
 4 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/newlib/libc/locale/locale.c b/newlib/libc/locale/locale.c
index 3772106e3..b16ec1511 100644
--- a/newlib/libc/locale/locale.c
+++ b/newlib/libc/locale/locale.c
@@ -317,7 +317,7 @@ _setlocale_r (struct _reent *p,
 
   if (category < LC_ALL || category >= _LC_LAST)
     {
-      p->_errno = EINVAL;
+      _REENT_ERRNO(p) = EINVAL;
       return NULL;
     }
 
@@ -343,7 +343,7 @@ _setlocale_r (struct _reent *p,
 	      env = __get_locale_env (p, i);
 	      if (strlen (env) > ENCODING_LEN)
 		{
-		  p->_errno = EINVAL;
+		  _REENT_ERRNO(p) = EINVAL;
 		  return NULL;
 		}
 	      strcpy (new_categories[i], env);
@@ -354,7 +354,7 @@ _setlocale_r (struct _reent *p,
 	  env = __get_locale_env (p, category);
 	  if (strlen (env) > ENCODING_LEN)
 	    {
-	      p->_errno = EINVAL;
+	      _REENT_ERRNO(p) = EINVAL;
 	      return NULL;
 	    }
 	  strcpy (new_categories[category], env);
@@ -364,7 +364,7 @@ _setlocale_r (struct _reent *p,
     {
       if (strlen (locale) > ENCODING_LEN)
 	{
-	  p->_errno = EINVAL;
+	  _REENT_ERRNO(p) = EINVAL;
 	  return NULL;
 	}
       strcpy (new_categories[category], locale);
@@ -375,7 +375,7 @@ _setlocale_r (struct _reent *p,
 	{
 	  if (strlen (locale) > ENCODING_LEN)
 	    {
-	      p->_errno = EINVAL;
+	      _REENT_ERRNO(p) = EINVAL;
 	      return NULL;
 	    }
 	  for (i = 1; i < _LC_LAST; ++i)
@@ -387,7 +387,7 @@ _setlocale_r (struct _reent *p,
 	    ;
 	  if (!r[1])
 	    {
-	      p->_errno = EINVAL;
+	      _REENT_ERRNO(p) = EINVAL;
 	      return NULL;  /* Hmm, just slashes... */
 	    }
 	  do
@@ -396,7 +396,7 @@ _setlocale_r (struct _reent *p,
 		break;  /* Too many slashes... */
 	      if ((len = r - locale) > ENCODING_LEN)
 		{
-		  p->_errno = EINVAL;
+		  _REENT_ERRNO(p) = EINVAL;
 		  return NULL;
 		}
 	      strlcpy (new_categories[i], locale, len + 1);
@@ -429,7 +429,7 @@ _setlocale_r (struct _reent *p,
       strcpy (saved_categories[i], __get_global_locale ()->categories[i]);
       if (__loadlocale (__get_global_locale (), i, new_categories[i]) == NULL)
 	{
-	  saverr = p->_errno;
+	  saverr = _REENT_ERRNO(p);
 	  for (j = 1; j < i; j++)
 	    {
 	      strcpy (new_categories[j], saved_categories[j]);
@@ -440,7 +440,7 @@ _setlocale_r (struct _reent *p,
 		  __loadlocale (__get_global_locale (), j, new_categories[j]);
 		}
 	    }
-	  p->_errno = saverr;
+	  _REENT_ERRNO(p) = saverr;
 	  return NULL;
 	}
     }
diff --git a/newlib/libc/locale/newlocale.c b/newlib/libc/locale/newlocale.c
index 278f78ed2..92f9e0a9c 100644
--- a/newlib/libc/locale/newlocale.c
+++ b/newlib/libc/locale/newlocale.c
@@ -103,7 +103,7 @@ _newlocale_r (struct _reent *p, int category_mask, const char *locale,
   /* Check for invalid mask values and valid locale ptr. */
   if ((category_mask & ~LC_VALID_MASK) || !locale)
     {
-      p->_errno = EINVAL;
+      _REENT_ERRNO(p) = EINVAL;
       return NULL;
     }
   /* If the new locale is supposed to be all default locale, just return
@@ -125,7 +125,7 @@ _newlocale_r (struct _reent *p, int category_mask, const char *locale,
 						: locale;
 	  if (strlen (cat) > ENCODING_LEN)
 	    {
-	      p->_errno = EINVAL;
+	      _REENT_ERRNO(p) = EINVAL;
 	      return NULL;
 	    }
 	  strcpy (new_categories[i], cat);
@@ -172,7 +172,7 @@ _newlocale_r (struct _reent *p, int category_mask, const char *locale,
 	  /* Otherwise load locale data. */
 	  else if (!__loadlocale (&tmp_locale, i, new_categories[i]))
 	    {
-	      p->_errno = ENOENT;
+	      _REENT_ERRNO(p) = ENOENT;
 	      goto error;
 	    }
 	}
diff --git a/newlib/libc/stdlib/_mallocr.c b/newlib/libc/stdlib/_mallocr.c
index 1997b6db1..c73982c18 100644
--- a/newlib/libc/stdlib/_mallocr.c
+++ b/newlib/libc/stdlib/_mallocr.c
@@ -346,7 +346,7 @@ extern void __malloc_unlock();
 #define RDECL struct _reent *reent_ptr;
 #endif
 
-#define RERRNO reent_ptr->_errno
+#define RERRNO _REENT_ERRNO(reent_ptr)
 #define RCALL reent_ptr,
 #define RONECALL reent_ptr
 
diff --git a/newlib/libc/stdlib/nano-mallocr.c b/newlib/libc/stdlib/nano-mallocr.c
index 41e69abb0..030be44ad 100644
--- a/newlib/libc/stdlib/nano-mallocr.c
+++ b/newlib/libc/stdlib/nano-mallocr.c
@@ -64,7 +64,7 @@
 #define MALLOC_LOCK __malloc_lock(reent_ptr)
 #define MALLOC_UNLOCK __malloc_unlock(reent_ptr)
 
-#define RERRNO reent_ptr->_errno
+#define RERRNO _REENT_ERRNO(reent_ptr)
 
 #define nano_malloc		_malloc_r
 #define nano_free		_free_r
-- 
2.34.1