[asan] Add a hidden option for Mach-O global metadata liveness tracking
llvm-svn: 274578
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 451f497..43d1b37 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -245,6 +245,13 @@
" variables"),
cl::Hidden, cl::init(false));
+static cl::opt<bool>
+ ClUseMachOGlobalsSection("asan-globals-live-support",
+ cl::desc("Use linker features to support dead "
+ "code stripping of globals "
+ "(Mach-O only)"),
+ cl::Hidden, cl::init(false));
+
// Debug flags.
static cl::opt<int> ClDebug("asan-debug", cl::desc("debug"), cl::Hidden,
cl::init(0));
@@ -1338,6 +1345,9 @@
// binary in order to allow the linker to properly dead strip. This is only
// supported on recent versions of ld64.
bool AddressSanitizerModule::ShouldUseMachOGlobalsSection() const {
+ if (!ClUseMachOGlobalsSection)
+ return false;
+
if (!TargetTriple.isOSBinFormatMachO())
return false;