From 6813065f5f2305d6cba308678b64a434945be055 Mon Sep 17 00:00:00 2001
From: Murray Cumming <murrayc@murrayc.com>
Date: Sun, 27 Oct 2019 16:25:44 +0100
Subject: wip: Use undefined-behavior sanitizer

In theory, this should cause failures when the tests run (make check) if
there are problems.

Ideally, we could enable this only for some builds in the CI.
---
 CMakeLists.txt | 2 +-
 configure.ac   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2e7f383..d3b3a0c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,7 @@ endif()
 # Add compiler warning flags & turn warnings into errors
 add_compile_options(
     "$<$<OR:$<CXX_COMPILER_ID:MSVC>,$<C_COMPILER_ID:MSVC>>:/W4;/WX>"
-    "$<$<OR:$<CXX_COMPILER_ID:GNU>,$<C_COMPILER_ID:GNU>>:-pedantic;-Wall;-Wextra;-Wsuggest-override;-Wshadow;-Wzero-as-null-pointer-constant;-Wformat-security>"
+    "$<$<OR:$<CXX_COMPILER_ID:GNU>,$<C_COMPILER_ID:GNU>>:-pedantic;-Wall;-Wextra;-Wsuggest-override;-Wshadow;-Wzero-as-null-pointer-constant;-Wformat-security -fsanitize=undefined>"
     "$<$<OR:$<CXX_COMPILER_ID:Clang>,$<C_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>,$<C_COMPILER_ID:AppleClang>>:-pedantic;-Wall;-Wextra;-Wshadow;-Wzero-as-null-pointer-constant;-Wformat-security>"
 )
 
diff --git a/configure.ac b/configure.ac
index d88205f..4a7483d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,7 +53,7 @@ AS_IF([test "x$config_error" = xyes],
 # Evaluate the --enable-warnings=level option.
 MM_ARG_ENABLE_WARNINGS([SIGC_WXXFLAGS],
                        [-Wall],
-                       [-pedantic -Wall -Wextra -Wsuggest-override -Wshadow -Wzero-as-null-pointer-constant -Wformat-security])
+                       [-pedantic -Wall -Wextra -Wsuggest-override -Wshadow -Wzero-as-null-pointer-constant -Wformat-security -fsanitize=undefined])
 
 # Offer the ability to omit some API from the library.
 MM_ARG_DISABLE_DEPRECATED_API([SIGCXX])
-- 
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