Clarify how to forward-declare __llvm_profile symbols.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@293065 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/SourceBasedCodeCoverage.rst b/docs/SourceBasedCodeCoverage.rst
index abb682355b1c33143d11d460646b75de67d6e153..8e72b2287e9c52cec38559db82413f102f04817b 100644 (file)
--- a/docs/SourceBasedCodeCoverage.rst
+++ b/docs/SourceBasedCodeCoverage.rst
@@ -256,6 +256,8 @@ without using static initializers, do this manually:
   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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