Pass CPPFLAGS to all calls of the C compiler

This variable is a standard way to inject options for the C
preprocessor. It's respected by the implicit rules of make
and autoconf/automake.

Debian sets this variable during package build to inject
`-D_FORTIFY_SOURCE=2` and we would like afl++ to respect it.

Note that this commit also adds $(CFLAGS) in the build of
afl-performance.o where it was missing. It might have been
on purpose but we want to keep CFLAGS everywhere as well
since Debian injects various options through that variable
(for hardening and reproducibility).

6 files changed, 45 insertions, 45 deletions

diff --git a/GNUmakefile b/GNUmakefile
index cae172dd..edabf995 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -368,78 +368,78 @@ ready:
 	@echo "[+] Everything seems to be working, ready to compile."
 
 afl-gcc: src/afl-gcc.c $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) src/$@.c -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) src/$@.c -o $@ $(LDFLAGS)
 	set -e; for i in afl-g++ afl-clang afl-clang++; do ln -sf afl-gcc $$i; done
 
 afl-as: src/afl-as.c include/afl-as.h $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) src/$@.c -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) src/$@.c -o $@ $(LDFLAGS)
 	ln -sf afl-as as
 
 src/afl-performance.o : $(COMM_HDR) src/afl-performance.c include/hash.h
-	$(CC) -Iinclude $(SPECIAL_PERFORMANCE) -O3 -fno-unroll-loops -c src/afl-performance.c -o src/afl-performance.o
+	$(CC) $(CFLAGS) $(CPPFLAGS) -Iinclude $(SPECIAL_PERFORMANCE) -O3 -fno-unroll-loops -c src/afl-performance.c -o src/afl-performance.o
 
 src/afl-common.o : $(COMM_HDR) src/afl-common.c include/common.h
-	$(CC) $(CFLAGS) $(CFLAGS_FLTO) -c src/afl-common.c -o src/afl-common.o
+	$(CC) $(CFLAGS) $(CFLAGS_FLTO) $(CPPFLAGS) -c src/afl-common.c -o src/afl-common.o
 
 src/afl-forkserver.o : $(COMM_HDR) src/afl-forkserver.c include/forkserver.h
-	$(CC) $(CFLAGS) $(CFLAGS_FLTO) -c src/afl-forkserver.c -o src/afl-forkserver.o
+	$(CC) $(CFLAGS) $(CFLAGS_FLTO) $(CPPFLAGS) -c src/afl-forkserver.c -o src/afl-forkserver.o
 
 src/afl-sharedmem.o : $(COMM_HDR) src/afl-sharedmem.c include/sharedmem.h
-	$(CC) $(CFLAGS) $(CFLAGS_FLTO) -c src/afl-sharedmem.c -o src/afl-sharedmem.o
+	$(CC) $(CFLAGS) $(CFLAGS_FLTO) $(CPPFLAGS) -c src/afl-sharedmem.c -o src/afl-sharedmem.o
 
 afl-fuzz: $(COMM_HDR) include/afl-fuzz.h $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(PYFLAGS) $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) $(CPPFLAGS) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(PYFLAGS) $(LDFLAGS)
 
 afl-showmap: src/afl-showmap.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o -o $@ $(LDFLAGS)
 
 afl-tmin: src/afl-tmin.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.o src/afl-performance.o -o $@ $(LDFLAGS)
 
 afl-analyze: src/afl-analyze.c src/afl-common.o src/afl-sharedmem.o src/afl-performance.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-performance.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o src/afl-sharedmem.o src/afl-performance.o -o $@ $(LDFLAGS)
 
 afl-gotcpu: src/afl-gotcpu.c src/afl-common.o $(COMM_HDR) | test_x86
-	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) src/$@.c src/afl-common.o -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(COMPILE_STATIC) $(CFLAGS_FLTO) $(CPPFLAGS) src/$@.c src/afl-common.o -o $@ $(LDFLAGS)
 
 
 # document all mutations and only do one run (use with only one input file!)
 document: $(COMM_HDR) include/afl-fuzz.h $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-performance.o | test_x86
-	$(CC) -D_DEBUG=\"1\" -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.c src/afl-performance.o -o afl-fuzz-document $(PYFLAGS) $(LDFLAGS)
+	$(CC) -D_DEBUG=\"1\" -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS) $(CFLAGS_FLTO) $(AFL_FUZZ_FILES) $(CPPFLAGS) src/afl-common.o src/afl-sharedmem.o src/afl-forkserver.c src/afl-performance.o -o afl-fuzz-document $(PYFLAGS) $(LDFLAGS)
 
 test/unittests/unit_maybe_alloc.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_maybe_alloc.c $(AFL_FUZZ_FILES)
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_maybe_alloc.c -o test/unittests/unit_maybe_alloc.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_maybe_alloc.c -o test/unittests/unit_maybe_alloc.o
 
 unit_maybe_alloc: test/unittests/unit_maybe_alloc.o
-	@$(CC) $(CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_maybe_alloc.o -o test/unittests/unit_maybe_alloc $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_maybe_alloc.o -o test/unittests/unit_maybe_alloc $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_maybe_alloc
 
 test/unittests/unit_hash.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_hash.c $(AFL_FUZZ_FILES) src/afl-performance.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_hash.c -o test/unittests/unit_hash.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_hash.c -o test/unittests/unit_hash.o
 
 unit_hash: test/unittests/unit_hash.o src/afl-performance.o
-	@$(CC) $(CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_hash $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_hash $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_hash
 
 test/unittests/unit_rand.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_rand.c $(AFL_FUZZ_FILES) src/afl-performance.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_rand.c -o test/unittests/unit_rand.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_rand.c -o test/unittests/unit_rand.o
 
 unit_rand: test/unittests/unit_rand.o src/afl-common.o src/afl-performance.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_rand  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf $^ -o test/unittests/unit_rand  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_rand
 
 test/unittests/unit_list.o : $(COMM_HDR) include/list.h test/unittests/unit_list.c $(AFL_FUZZ_FILES)
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_list.c -o test/unittests/unit_list.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_list.c -o test/unittests/unit_list.o
 
 unit_list: test/unittests/unit_list.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_list.o -o test/unittests/unit_list  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_list.o -o test/unittests/unit_list  $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_list
 
 test/unittests/unit_preallocable.o : $(COMM_HDR) include/alloc-inl.h test/unittests/unit_preallocable.c $(AFL_FUZZ_FILES)
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -c test/unittests/unit_preallocable.c -o test/unittests/unit_preallocable.o
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -c test/unittests/unit_preallocable.c -o test/unittests/unit_preallocable.o
 
 unit_preallocable: test/unittests/unit_preallocable.o
-	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_preallocable.o -o test/unittests/unit_preallocable $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
+	@$(CC) $(CFLAGS) $(ASAN_CFLAGS) $(CPPFLAGS) -Wl,--wrap=exit -Wl,--wrap=printf test/unittests/unit_preallocable.o -o test/unittests/unit_preallocable $(LDFLAGS) $(ASAN_LDFLAGS) -lcmocka
 	./test/unittests/unit_preallocable
 
 unit_clean:
diff --git a/custom_mutators/radamsa/GNUmakefile b/custom_mutators/radamsa/GNUmakefile
index 60e43b17..3798b110 100644
--- a/custom_mutators/radamsa/GNUmakefile
+++ b/custom_mutators/radamsa/GNUmakefile
@@ -15,14 +15,14 @@ libradamsa.a: libradamsa.c radamsa.h
 	@echo " ***************************************************************"
 	@echo " * Compiling libradamsa, wait some minutes (~3 on modern CPUs) *"
 	@echo " ***************************************************************"
-	$(CC) -fPIC $(CFLAGS) -I $(CUR_DIR) -o libradamsa.a -c libradamsa.c
+	$(CC) -fPIC $(CFLAGS) $(CPPFLAGS) -I $(CUR_DIR) -o libradamsa.a -c libradamsa.c
 
 radamsa-mutator.so: radamsa-mutator.c libradamsa.a
-	$(CC) $(CFLAGS) -g -I. -I../../include -shared -fPIC -c radamsa-mutator.c
-	$(CC) $(CFLAGS) -shared -fPIC -o radamsa-mutator.so radamsa-mutator.o libradamsa.a
+	$(CC) $(CFLAGS) $(CPPFLAGS) -g -I. -I../../include -shared -fPIC -c radamsa-mutator.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -shared -fPIC -o radamsa-mutator.so radamsa-mutator.o libradamsa.a
 
 test: libradamsa.a libradamsa-test.c
-	$(CC) $(CFLAGS) -I $(CUR_DIR) -o libradamsa-test libradamsa-test.c libradamsa.a
+	$(CC) $(CFLAGS) $(CPPFLAGS) -I $(CUR_DIR) -o libradamsa-test libradamsa-test.c libradamsa.a
 	./libradamsa-test libradamsa-test.c | grep "library test passed"
 	rm /tmp/libradamsa-*.fuzz
 
diff --git a/gcc_plugin/GNUmakefile b/gcc_plugin/GNUmakefile
index f10a6c1d..48625e31 100644
--- a/gcc_plugin/GNUmakefile
+++ b/gcc_plugin/GNUmakefile
@@ -111,21 +111,21 @@ test_deps:
 	@echo "[+] All set and ready to build."
 
 afl-common.o: ../src/afl-common.c
-	$(CC) $(CFLAGS) -c $< -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@ $(LDFLAGS)
 
 ../afl-gcc-fast: afl-gcc-fast.c afl-common.o | test_deps
-	$(CC) -DAFL_GCC_CC=\"$(CC)\" -DAFL_GCC_CXX=\"$(CXX)\" $(CFLAGS) $< afl-common.o -o $@ $(LDFLAGS)
+	$(CC) -DAFL_GCC_CC=\"$(CC)\" -DAFL_GCC_CXX=\"$(CXX)\" $(CFLAGS) $(CPPFLAGS) $< afl-common.o -o $@ $(LDFLAGS)
 	ln -sf afl-gcc-fast ../afl-g++-fast
 
 ../afl-gcc-pass.so: afl-gcc-pass.so.cc | test_deps
 	$(CXX) $(CXXEFLAGS) $(PLUGIN_FLAGS) -shared $< -o $@
 
 ../afl-gcc-rt.o: afl-gcc-rt.o.c | test_deps
-	$(CC) $(CFLAGS_SAFE) -fPIC -c $< -o $@
+	$(CC) $(CFLAGS_SAFE) $(CPPFLAGS) -fPIC -c $< -o $@
 
 test_build: $(PROGS)
 	@echo "[*] Testing the CC wrapper and instrumentation output..."
-	unset AFL_USE_ASAN AFL_USE_MSAN; AFL_QUIET=1 AFL_INST_RATIO=100 AFL_PATH=. AFL_CC=$(CC) ../afl-gcc-fast $(CFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
+	unset AFL_USE_ASAN AFL_USE_MSAN; AFL_QUIET=1 AFL_INST_RATIO=100 AFL_PATH=. AFL_CC=$(CC) ../afl-gcc-fast $(CFLAGS) $(CPPFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
 #	unset AFL_USE_ASAN AFL_USE_MSAN;             AFL_INST_RATIO=100 AFL_PATH=. AFL_CC=$(CC) ../afl-gcc-fast $(CFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
 	ASAN_OPTIONS=detect_leaks=0 ../afl-showmap -m none -q -o .test-instr0 ./test-instr </dev/null
 	echo 1 | ASAN_OPTIONS=detect_leaks=0 ../afl-showmap -m none -q -o .test-instr1 ./test-instr
diff --git a/libdislocator/Makefile b/libdislocator/Makefile
index f9c4cb65..1c2fcaa7 100644
--- a/libdislocator/Makefile
+++ b/libdislocator/Makefile
@@ -28,7 +28,7 @@ all: libdislocator.so
 
 VPATH = ..
 libdislocator.so: libdislocator.so.c ../config.h
-	$(CC) $(CFLAGS) -shared -fPIC libdislocator.so.c -o ../$@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -shared -fPIC libdislocator.so.c -o ../$@ $(LDFLAGS)
 
 .NOTPARALLEL: clean
 
diff --git a/libtokencap/Makefile b/libtokencap/Makefile
index 244ee58f..00dbb954 100644
--- a/libtokencap/Makefile
+++ b/libtokencap/Makefile
@@ -70,7 +70,7 @@ all: $(TARGETS)
 
 VPATH = ..
 libtokencap.so: libtokencap.so.c ../config.h
-	$(CC) $(CFLAGS) -shared -fPIC $< -o ../$@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -shared -fPIC $< -o ../$@ $(LDFLAGS)
 
 .NOTPARALLEL: clean
 
diff --git a/llvm_mode/GNUmakefile b/llvm_mode/GNUmakefile
index 702c2c08..1eb833eb 100644
--- a/llvm_mode/GNUmakefile
+++ b/llvm_mode/GNUmakefile
@@ -329,10 +329,10 @@ endif
 	@echo "[+] All set and ready to build."
 
 afl-common.o: ../src/afl-common.c
-	$(CC) $(CFLAGS) -c $< -o $@ $(LDFLAGS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@ $(LDFLAGS)
 
 ../afl-clang-fast: afl-clang-fast.c afl-common.o | test_deps
-	$(CC) $(CLANG_CFL) $(CFLAGS) $< afl-common.o -o $@ $(LDFLAGS) -DCFLAGS_OPT=\"$(CFLAGS_OPT)\"
+	$(CC) $(CLANG_CFL) $(CFLAGS) $(CPPFLAGS) $< afl-common.o -o $@ $(LDFLAGS) -DCFLAGS_OPT=\"$(CFLAGS_OPT)\"
 	ln -sf afl-clang-fast ../afl-clang-fast++
 ifneq "$(AFL_CLANG_FLTO)" ""
 ifeq "$(LLVM_LTO)" "1"
@@ -342,7 +342,7 @@ endif
 endif
 
 afl-llvm-common.o: afl-llvm-common.cc afl-llvm-common.h
-	$(CXX) $(CFLAGS) `$(LLVM_CONFIG) --cxxflags` -fno-rtti -fPIC -std=$(LLVM_STDCXX) -c $< -o $@ 
+	$(CXX) $(CFLAGS) $(CPPFLAGS) `$(LLVM_CONFIG) --cxxflags` -fno-rtti -fPIC -std=$(LLVM_STDCXX) -c $< -o $@ 
 
 ../libLLVMInsTrim.so: LLVMInsTrim.so.cc MarkNodes.cc afl-llvm-common.o | test_deps
 	-$(CXX) $(CLANG_CPPFL) -DLLVMInsTrim_EXPORTS -fno-rtti -fPIC -std=$(LLVM_STDCXX) -shared $< MarkNodes.cc -o $@ $(CLANG_LFL) afl-llvm-common.o
@@ -360,7 +360,7 @@ endif
 
 ../afl-ld-lto: afl-ld-lto.c
 ifeq "$(LLVM_LTO)" "1"
-	$(CC) $(CFLAGS) $< -o $@
+	$(CC) $(CFLAGS) $(CPPFLAGS) $< -o $@
 endif
 
 ../SanitizerCoverageLTO.so: SanitizerCoverageLTO.so.cc
@@ -371,9 +371,9 @@ endif
 ../afl-llvm-lto-instrumentation.so: afl-llvm-lto-instrumentation.so.cc afl-llvm-common.o
 ifeq "$(LLVM_LTO)" "1"
 	$(CXX) $(CLANG_CPPFL) -Wno-writable-strings -fno-rtti -fPIC -std=$(LLVM_STDCXX) -shared $< -o $@ $(CLANG_LFL) afl-llvm-common.o
-	$(CLANG_BIN) $(CFLAGS_SAFE) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto.o
-	@$(CLANG_BIN) $(CFLAGS_SAFE) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m64 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-64.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
-	@$(CLANG_BIN) $(CFLAGS_SAFE) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m32 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-32.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
+	$(CLANG_BIN) $(CFLAGS_SAFE) $(CPPFLAGS) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto.o
+	@$(CLANG_BIN) $(CFLAGS_SAFE) $(CPPFLAGS) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m64 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-64.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
+	@$(CLANG_BIN) $(CFLAGS_SAFE) $(CPPFLAGS) -Wno-unused-result -O0 $(AFL_CLANG_FLTO) -m32 -fPIC -c afl-llvm-rt-lto.o.c -o ../afl-llvm-rt-lto-32.o 2>/dev/null; if [ "$$?" = "0" ]; then : ; fi
 endif
 
 # laf
@@ -392,20 +392,20 @@ endif
 	$(CXX) $(CLANG_CPPFL) -shared $< -o $@ $(CLANG_LFL) afl-llvm-common.o
 
 document:
-	$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CLANG_CFL) -O3 -Wno-unused-result -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt.o
-	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CLANG_CFL) -O3 -Wno-unused-result -m32 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-32.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
-	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CLANG_CFL) -O3 -Wno-unused-result -m64 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-64.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CPPFLAGS) $(CLANG_CFL) -O3 -Wno-unused-result -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt.o
+	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CPPFLAGS) $(CLANG_CFL) -O3 -Wno-unused-result -m32 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-32.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	@$(CLANG_BIN) -D_AFL_DOCUMENT_MUTATIONS $(CFLAGS_SAFE) $(CPPFLAGS) $(CLANG_CFL) -O3 -Wno-unused-result -m64 -fPIC -c afl-llvm-rt.o.c -o ../afl-llvm-rt-64.o 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
 
 ../afl-llvm-rt.o: afl-llvm-rt.o.c | test_deps
-	$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) -O3 -Wno-unused-result -fPIC -c $< -o $@
+	$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) $(CPPFLAGS) -O3 -Wno-unused-result -fPIC -c $< -o $@
 
 ../afl-llvm-rt-32.o: afl-llvm-rt.o.c | test_deps
 	@printf "[*] Building 32-bit variant of the runtime (-m32)... "
-	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) -O3 -Wno-unused-result -m32 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) $(CPPFLAGS) -O3 -Wno-unused-result -m32 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
 
 ../afl-llvm-rt-64.o: afl-llvm-rt.o.c | test_deps
 	@printf "[*] Building 64-bit variant of the runtime (-m64)... "
-	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) -O3 -Wno-unused-result -m64 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+	@$(CLANG_BIN) $(CLANG_CFL) $(CFLAGS_SAFE) $(CPPFLAGS) -O3 -Wno-unused-result -m64 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
 
 test_build: $(PROGS)
 	@echo "[*] Testing the CC wrapper and instrumentation output..."