From 3f4349dc8b9494315f8331b2ea4e8d1f83fb801d Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Fri, 29 Jun 2012 13:40:27 +0200
Subject: coroutine-ucontext: Help valgrind understand coroutines

valgrind tends to get confused and report false positives when you
switch stacks and don't tell it about it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index 0a3896e757..cef0a71a27 100755
--- a/configure
+++ b/configure
@@ -2870,6 +2870,22 @@ if compile_prog "" "" ; then
     linux_magic_h=yes
 fi
 
+########################################
+# check if we have valgrind/valgrind.h
+
+valgrind_h=no
+cat > $TMPC << EOF
+#include <valgrind/valgrind.h>
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+int main(void) {
+  VALGRIND_STACK_DEREGISTER(0);
+  return 0;
+}
+EOF
+if compile_prog "" "" ; then
+    valgrind_h=yes
+fi
+
 ########################################
 # check if environ is declared
 
@@ -3379,6 +3395,10 @@ if test "$linux_magic_h" = "yes" ; then
   echo "CONFIG_LINUX_MAGIC_H=y" >> $config_host_mak
 fi
 
+if test "$valgrind_h" = "yes" ; then
+  echo "CONFIG_VALGRIND_H=y" >> $config_host_mak
+fi
+
 if test "$has_environ" = "yes" ; then
   echo "CONFIG_HAS_ENVIRON=y" >> $config_host_mak
 fi
-- 
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