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-rw-r--r--clang/docs/SanitizerCoverage.rst1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/docs/SanitizerCoverage.rst b/clang/docs/SanitizerCoverage.rst
index efcb49e6eb4..f8ac1dc2df9 100644
--- a/clang/docs/SanitizerCoverage.rst
+++ b/clang/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.
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