[sanitizer-coverage] don't instrument available_externally functions
llvm-svn: 309611
diff --git a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index fb7f8ec..1b6d6d6 100644
--- a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -418,6 +418,9 @@
return false; // Should not instrument sanitizer init functions.
if (F.getName().startswith("__sanitizer_"))
return false; // Don't instrument __sanitizer_* callbacks.
+ // Don't touch available_externally functions, their actual body is elewhere.
+ if (F.getLinkage() == GlobalValue::AvailableExternallyLinkage)
+ return false;
// Don't instrument MSVC CRT configuration helpers. They may run before normal
// initialization.
if (F.getName() == "__local_stdio_printf_options" ||