From abb437c0abedc6646927381017666db3f962befd Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 14 Sep 2011 07:05:13 +0930
Subject: ccan: configure check for HAVE_BUILTIN_CHOOSE_EXPR

We weren't testing for this, and without it, typesafe_cb just casts
its function argument.  This is why I didn't get a warning when one of
my patches amended a function incorrectly.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 lib/ccan/wscript | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/ccan/wscript')

diff --git a/lib/ccan/wscript b/lib/ccan/wscript
index 0543a4de07..9daf091e5b 100644
--- a/lib/ccan/wscript
+++ b/lib/ccan/wscript
@@ -79,6 +79,9 @@ def configure(conf):
         Logs.error("Failed endian determination.  The PDP-11 is back?")
         sys.exit(1)
 
+    conf.CHECK_CODE('return __builtin_choose_expr(1, 0, "garbage");',
+                    link=True,
+                    define='HAVE_BUILTIN_CHOOSE_EXPR')
     conf.CHECK_CODE('return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;',
                     link=True,
                     define='HAVE_BUILTIN_CLZ')
-- 
cgit