From 1717da59aed9612becd56aaa1249aac695af4c8a Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@linux.intel.com>
Date: Thu, 16 May 2013 19:17:14 -0700
Subject: Add a configure option to enable lock elision and disable by default

Can be enabled with --enable-lock-elision=yes at configure time.
---
 configure | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index edde310..a873b20 100755
--- a/configure
+++ b/configure
@@ -742,6 +742,7 @@ enable_versioning
 enable_oldest_abi
 enable_hardcoded_path_in_tests
 enable_stackguard_randomization
+enable_lock_elision
 enable_add_ons
 enable_hidden_plt
 enable_bind_now
@@ -1399,6 +1400,9 @@ Optional Features:
   --enable-stackguard-randomization
                           initialize __stack_chk_guard canary with a random
                           number at program start
+  --enable-lock-elision=yes/no
+                          Enable lock elision for pthread mutexes and rwlocks
+                          by default
   --enable-add-ons[=DIRS...]
                           configure and build add-ons in DIR1,DIR2,... search
                           for add-ons if no parameter given
@@ -3472,6 +3476,18 @@ if test "$enable_stackguard_randomize" = yes; then
 
 fi
 
+# Check whether --enable-lock-elision was given.
+if test "${enable_lock_elision+set}" = set; then :
+  enableval=$enable_lock_elision; enable_lock_elision=$enableval
+else
+  enable_lock_elision=no
+fi
+
+if test "$enable_lock_elision" = yes ; then
+  $as_echo "#define ENABLE_LOCK_ELISION 1" >>confdefs.h
+
+fi
+
 # Check whether --enable-add-ons was given.
 if test "${enable_add_ons+set}" = set; then :
   enableval=$enable_add_ons;
-- 
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