Flag -fsanitize=fuzzer to enable libfuzzer

Previously, adding libfuzzer to a project was a multi-step procedure,
involving libfuzzer compilation, linking the library, and specifying
coverage flags.
With this change,libfuzzer can be enabled by adding a single
-fsanitize=fuzzer flag instead.

llvm-svn: 301212

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index 8e61aadbf32..c9561367a3a 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -265,6 +265,10 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
       Add &= ~InvalidTrappingKinds;
       Add &= Supported;
 
+      // Enable coverage if the fuzzing flag is set.
+      if (Add & Fuzzer)
+        CoverageFeatures |= CoverageTracePCGuard | CoverageIndirCall | CoverageTraceCmp;
+
       Kinds |= Add;
     } else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
       Arg->claim();