[flang] [lldb] [libcxx] [lld] [clang-tools-extra] [clang] [llvm] [libclc] [compiler-rt] [libc] [libcxxabi] [Thumb,ELF] Fix access to dso_preemptable __stack_chk_guard with static relocation model (PR #78950)

Mon, 22 Jan 2024 12:35:19 -0800 

================
@@ -135,14 +135,14 @@ void 
Thumb1InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
 void Thumb1InstrInfo::expandLoadStackGuard(
     MachineBasicBlock::iterator MI) const {
   MachineFunction &MF = *MI->getParent()->getParent();
-  const TargetMachine &TM = MF.getTarget();
   const ARMSubtarget &ST = MF.getSubtarget<ARMSubtarget>();
+  const auto *GV = cast<GlobalValue>((*MI->memoperands_begin())->getValue());
 
   assert(MF.getFunction().getParent()->getStackProtectorGuard() != "tls" &&
          "TLS stack protector not supported for Thumb1 targets");
 
   unsigned Instr;
-  if (TM.isPositionIndependent())
+  if (!GV->isDSOLocal())
----------------
nickdesaulniers wrote:

does Thumb1 need similar guards for whether the target is elf?

https://github.com/llvm/llvm-project/pull/78950
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