As the preceding table shows, we need to compile our target application membugs with the appropriate compiler flag(s). Also, instead of using gcc as the compiler, it's recommended we use clang.
clang is considered a compiler frontend for several programming languages, including C and C++; the backend is the LLVM compiler infrastructure project. More information on Clang is available on its Wikipedia page.
You will need to ensure that the Clang package is installed on your Linux box; using your distribution's package manager (apt-get, dnf, rpm) would be the easiest way.
This snippet from our Makefile shows how we use clang to compile the membugs sanitizer targets:
CC=${CROSS_COMPILE}gcc
CL=${CROSS_COMPILE}clang
CFLAGS=-Wall -UDEBUG
CFLAGS_DBG=-g -ggdb -gdwarf-4 -O0 -Wall -Wextra -DDEBUG
CFLAGS_DBG_ASAN=${CFLAGS_DBG} -fsanitize=address
CFLAGS_DBG_MSAN=${CFLAGS_DBG} -fsanitize=memory
CFLAGS_DBG_UB=${CFLAGS_DBG} -fsanitize=undefined
[...]
#--- Sanitizers (use clang): <foo>_dbg_[asan|ub|msan]
membugs_dbg_asan.o: membugs.c
${CL} ${CFLAGS_DBG_ASAN} -c membugs.c -o membugs_dbg_asan.o
membugs_dbg_asan: membugs_dbg_asan.o common_dbg_asan.o
${CL} ${CFLAGS_DBG_ASAN} -o membugs_dbg_asan membugs_dbg_asan.o common_dbg_asan.o
membugs_dbg_ub.o: membugs.c
${CL} ${CFLAGS_DBG_UB} -c membugs.c -o membugs_dbg_ub.o
membugs_dbg_ub: membugs_dbg_ub.o common_dbg_ub.o
${CL} ${CFLAGS_DBG_UB} -o membugs_dbg_ub membugs_dbg_ub.o common_dbg_ub.o
membugs_dbg_msan.o: membugs.c
${CL} ${CFLAGS_DBG_MSAN} -c membugs.c -o membugs_dbg_msan.o
membugs_dbg_msan: membugs_dbg_msan.o common_dbg_msan.o
${CL} ${CFLAGS_DBG_MSAN} -o membugs_dbg_msan membugs_dbg_msan.o common_dbg_msan.o
[...]