<div><div dir="auto">How broken is it, in what platform? Is rtti enabled/disabled throughout, or are there different rtti configurations for different libraries?</div><div dir="auto"><br></div><div dir="auto">Thank you,</div><div dir="auto"><br></div><div dir="auto"> Filipe</div><br><div class="gmail_quote"><div>On Sun, 17 Dec 2017 at 20:36, Rémi Denis-Courmont <<a href="mailto:remi@remlab.net">remi@remlab.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This is notoriously broken in UBSan, causing a lot of false positives<br>
with TagLib.<br>
---<br>
 <a href="http://configure.ac" rel="noreferrer" target="_blank">configure.ac</a> | 3 +++<br>
 1 file changed, 3 insertions(+)<br>
<br>
diff --git a/<a href="http://configure.ac" rel="noreferrer" target="_blank">configure.ac</a> b/<a href="http://configure.ac" rel="noreferrer" target="_blank">configure.ac</a><br>
index acbee6c0b1..57c2f091f3 100644<br>
--- a/<a href="http://configure.ac" rel="noreferrer" target="_blank">configure.ac</a><br>
+++ b/<a href="http://configure.ac" rel="noreferrer" target="_blank">configure.ac</a><br>
@@ -1037,6 +1037,9 @@ AS_VAR_IF(with_sanitizer, no, [], [<br>
         AX_APPEND_COMPILE_FLAGS([-fPIE -pie])<br>
         AX_APPEND_COMPILE_FLAGS([-fPIE -pie], [CXXFLAGS])<br>
     ])<br>
+    AS_IF([test -z "${with_sanitizer##*undefined*}" ], [<br>
+        AX_APPEND_COMPILE_FLAGS([-fno-sanitize=vptr], [CXXFLAGS])<br>
+    ])<br>
 ])<br>
<br>
 dnl<br>
--<br>
2.15.1<br>
<br>
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