Clarify how to forward-declare __llvm_profile symbols.
llvm-svn: 293065
diff --git a/clang/docs/SourceBasedCodeCoverage.rst b/clang/docs/SourceBasedCodeCoverage.rst
index abb6823..8e72b22 100644
--- a/clang/docs/SourceBasedCodeCoverage.rst
+++ b/clang/docs/SourceBasedCodeCoverage.rst
@@ -256,6 +256,8 @@
otherwise. Calling this function multiple times appends profile data to an
existing on-disk raw profile.
+In C++ files, declare these as ``extern "C"``.
+
Collecting coverage reports for the llvm project
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