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@xxxxxxxxxx>
---
Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index 6b72f37c29..bbcfc2bc9f 100644
--- a/Makefile
+++ b/Makefile
@@ -3104,7 +3104,7 @@ cover_db_html: cover_db
# 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
#
--
2.20.1.97.g81188d93c3-goog
