add ubsan option

Author: Mic92

configure.ac

@@ -20,9 +20,14 @@ if test "$DEFAULT_PAGESIZE" != auto; then
 fi
 
 AC_ARG_WITH([asan],
-   AS_HELP_STRING([--with-asan], [Link with libasan])
+   AS_HELP_STRING([--with-asan], [Build with address sanitizer])
 )
 AM_CONDITIONAL([WITH_ASAN], [test x"$with_asan" = xyes])
 
+AC_ARG_WITH([ubsan],
+   AS_HELP_STRING([--with-ubsan], [Build with undefined behavior sanitizer])
+)
+AM_CONDITIONAL([WITH_UBSAN], [test x"$with_ubsan" = xyes])
+
 AC_CONFIG_FILES([Makefile src/Makefile tests/Makefile patchelf.spec])
 AC_OUTPUT

src/Makefile.am

@@ -1,7 +1,13 @@
 AM_CXXFLAGS = -Wall -std=c++11 -D_FILE_OFFSET_BITS=64
 
+SAN_FLAGS = -fno-optimize-sibling-calls -fsanitize-address-use-after-scope -fno-omit-frame-pointer -g -O1
+
 if WITH_ASAN
-AM_CXXFLAGS += -fsanitize=address -fno-optimize-sibling-calls -fsanitize-address-use-after-scope -fno-omit-frame-pointer -g -O1
+AM_CXXFLAGS += -fsanitize=address $(SAN_FLAGS)
+endif
+
+if WITH_UBSAN
+AM_CXXFLAGS += -fsanitize=undefined $(SAN_FLAGS)
 endif
 
 bin_PROGRAMS = patchelf