[MLIR] Temporary workaround for calling the LLD ELF driver as-a-lib

This fixes the situation described in https://github.com/llvm/llvm-project/issues/53475 with a repro exposed by https://github.com/ROCmSoftwarePlatform/D108850-lld-bug-reproduction

This is purposely just a workaround to unblock users. This could be transplanted to the release/14.x branch if need be. A proper fix will later be provided in https://reviews.llvm.org/D119049.

Differential Revision: https://reviews.llvm.org/D119277

1 files changed, 9 insertions, 0 deletions

diff --git a/lld/Common/CommonLinkerContext.cpp b/lld/Common/CommonLinkerContext.cpp
index 50ccbb37c796..90f0f942a38c 100644
--- a/lld/Common/CommonLinkerContext.cpp
+++ b/lld/Common/CommonLinkerContext.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "lld/Common/CommonLinkerContext.h"
+#include "lld/Common/Driver.h"
 #include "lld/Common/ErrorHandler.h"
 #include "lld/Common/Memory.h"
 
@@ -43,3 +44,11 @@ void CommonLinkerContext::destroy() {
     return;
   delete lctx;
 }
+
+// Temporary API that forces global state cleanup between explicit calls to
+// drivers. See discussion in https://reviews.llvm.org/D119049.
+void lld::cleanup() {
+  // Delete the global context and clear the global context pointer, so that it
+  // cannot be accessed anymore.
+  CommonLinkerContext::destroy();
+}