[libFuzzer] clarify the limitation of fsanitize-coverage=trace-cmp

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@254337 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/SanitizerCoverage.rst b/docs/SanitizerCoverage.rst
index efcb49e6eb42caa474f5c71d858f4118fdadc119..f8ac1dc2df97508f58c3940e507157d4ba681b81 100644 (file)
--- a/docs/SanitizerCoverage.rst
+++ b/docs/SanitizerCoverage.rst
@@ -275,6 +275,7 @@ they will be called by the instrumented code.
   void __sanitizer_cov_trace_switch(uint64_t Val, uint64_t *Cases);
 
 This interface is a subject to change.
+The current implementation is not thread-safe and thus can be safely used only for single-threaded targets.
 
 Output directory
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