From 065d77dd0232efb4a49494ff9d2797da9c537e28 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Fri, 13 May 2022 13:55:06 +0200
Subject: Add --enable-newlib-reent-binary-compat

Add the --enable-newlib-reent-binary-compat configure option.  This option is
disabled by default.  If enabled, then unused members in struct _reent are
preserved to maintain the structure layout.
---
 newlib/configure | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'newlib/configure')

diff --git a/newlib/configure b/newlib/configure
index c83511da6..60cbc1fa8 100755
--- a/newlib/configure
+++ b/newlib/configure
@@ -972,6 +972,7 @@ enable_newlib_iconv_external_ccs
 enable_newlib_atexit_dynamic_alloc
 enable_newlib_global_atexit
 enable_newlib_reent_small
+enable_newlib_reent_binary_compat
 enable_newlib_global_stdio_streams
 enable_newlib_fvwrite_in_streamio
 enable_newlib_fseek_optimization
@@ -1639,6 +1640,7 @@ Optional Features:
   --disable-newlib-atexit-dynamic-alloc    disable dynamic allocation of atexit entries
   --enable-newlib-global-atexit	enable atexit data structure as global
   --enable-newlib-reent-small   enable small reentrant struct support
+  --enable-newlib-reent-binary-compat   enable backward binary compatibility for struct _reent
   --enable-newlib-global-stdio-streams   enable global stdio streams
   --disable-newlib-fvwrite-in-streamio    disable iov in streamio
   --disable-newlib-fseek-optimization    disable fseek optimization
@@ -2390,6 +2392,19 @@ else
   newlib_reent_small=
 fi
 
+# Check whether --enable-newlib-reent-binary-compat was given.
+if test "${enable_newlib_reent_binary_compat+set}" = set; then :
+  enableval=$enable_newlib_reent_binary_compat; if test "${newlib_reent_binary_compat+set}" != set; then
+  case "${enableval}" in
+    yes) newlib_reent_binary_compat=yes ;;
+    no)  newlib_reent_binary_compat=no  ;;
+    *)   as_fn_error $? "bad value ${enableval} for newlib-enable-reent-binary-compat option" "$LINENO" 5 ;;
+  esac
+ fi
+else
+  newlib_reent_binary_compat=no
+fi
+
 # Check whether --enable-newlib-global-stdio-streams was given.
 if test "${enable_newlib_global_stdio_streams+set}" = set; then :
   enableval=$enable_newlib_global_stdio_streams; case "${enableval}" in
@@ -6418,6 +6433,12 @@ $as_echo "#define _WANT_REENT_SMALL 1" >>confdefs.h
 
 fi
 
+if test "${newlib_reent_binary_compat}" = "yes"; then
+
+$as_echo "#define _WANT_REENT_BACKWARD_BINARY_COMPAT 1" >>confdefs.h
+
+fi
+
 if test "${newlib_global_stdio_streams}" = "yes"; then
 
 $as_echo "#define _WANT_REENT_GLOBAL_STDIO_STREAMS 1" >>confdefs.h
-- 
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