From c2b2f22392e77fa98a3f71daf915ebe1a5239e99 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Mon, 14 Feb 2022 06:34:00 -0800
Subject: configure: detect ubsan compilation.

* configure: detect that the compiler is generating undefined
behavior sanitizer code, a feature supported in GCC and Clang.
The tell-tale sign of this is that "ubsan" occurs in the
executable. If so, we deposit #define HAVE_UBSAN 1 into
config.h.
---
 configure | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index 88dca391..bd6d7a58 100755
--- a/configure
+++ b/configure
@@ -1210,6 +1210,27 @@ else
   printf "done\n"
 fi
 
+printf "Checking for undefined behavior sanitizer (\"ubsan\") being in effect ... "
+
+cat > conftest.c <<!
+#include <stdio.h>
+
+int main(void)
+{
+   return 0;
+}
+!
+if conftest ; then
+  if strings conftest | grep -q -i ubsan ; then
+    printf "yes\n"
+    printf "#define HAVE_UBSAN 1\n" >> config.h
+  else
+    printf "no\n"
+  fi
+else
+  printf "failed\n"
+fi
+
 #
 # Detect Apple environment. We need _DARWIN_C_SOURCE.
 #
-- 
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