From 3ae5fc9a6a881e0be381e4cc70080ac5908d7520 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 6 Sep 2021 18:57:30 +0200
Subject: [PATCH] patch 8.2.3406: on some systems tests fail without _REENTRANT

Problem:    On some systems tests fail without _REENTRANT. (Elimar
            Riesebieter)
Solution:   Add -D_REENTRANT in configure. (closes #7402)
---
 src/auto/configure | 4 ++++
 src/configure.ac   | 6 ++++++
 src/version.c      | 2 ++
 3 files changed, 12 insertions(+)

diff --git a/src/auto/configure b/src/auto/configure
index fba6a19b5..4f4363224 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -14960,6 +14960,10 @@ $as_echo "no" >&6; }
   fi
 fi
 
+if `echo "$CFLAGS" | grep -v D_XEENTRANT >/dev/null`; then
+  CFLAGS="$CFLAGS -D_REENTRANT"
+fi
+
 DEPEND_CFLAGS_FILTER=
 if test "$GCC" = yes; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GCC 3 or later" >&5
diff --git a/src/configure.ac b/src/configure.ac
index 5ec955757..4cd6dea1f 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -4504,6 +4504,12 @@ if test "$MACOS_X" = "yes"; then
   fi
 fi
 
+dnl On some systems REENTRANT needs to be defined.  It should not hurt to use
+dnl it everywhere.
+if `echo "$CFLAGS" | grep -v D_REENTRANT >/dev/null`; then
+  CFLAGS="$CFLAGS -D_REENTRANT"
+fi
+
 dnl gcc 3.1 changed the meaning of -MM.  The only solution appears to be to
 dnl use "-isystem" instead of "-I" for all non-Vim include dirs.
 dnl But only when making dependencies, cproto and lint don't take "-isystem".
-- 
2.31.1