The comment explaining how to build the fuzzers was broken in
927c77e7d4d ("Makefile: use FUZZ_CXXFLAGS for linking fuzzers",
2018-11-14).
When building fuzzers, all .c files must be compiled with coverage
tracing enabled. This is not possible when using only FUZZ_CXXFLAGS, as
that flag is only applied to the fuzzers themselves. Switching back to
CFLAGS fixes the issue.
Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
# An example command to build against libFuzzer from LLVM 4.0.0:
#
# make CC=clang CXX=clang++ \
-# FUZZ_CXXFLAGS="-fsanitize-coverage=trace-pc-guard -fsanitize=address" \
+# CFLAGS="-fsanitize-coverage=trace-pc-guard -fsanitize=address" \
# LIB_FUZZING_ENGINE=/usr/lib/llvm-4.0/lib/libFuzzer.a \
# fuzz-all
#