[Lldb-commits] [PATCH] D109339: Fix compilation error with older libstdc++

Vadim Chugunov via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Mon Sep 6 16:55:04 PDT 2021

vadimcn created this revision.
vadimcn added a reviewer: jingham.
vadimcn added a project: LLDB.
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Until GCC 6, std::unordered_map could not emplace non-copyable values, which results in this error: "error: call to implicitly-deleted copy constructor of 'lldb_private::ThreadPlanStack'" (due to ThreadPlanStack::m_stack_mutex not being copyable).   Using std::piecewise_construct works around this problem.

  rG LLVM Github Monorepo



Index: lldb/include/lldb/Target/ThreadPlanStack.h
--- lldb/include/lldb/Target/ThreadPlanStack.h
+++ lldb/include/lldb/Target/ThreadPlanStack.h
@@ -124,7 +124,9 @@
   void AddThread(Thread &thread) {
     lldb::tid_t tid = thread.GetID();
-    m_plans_list.emplace(tid, thread);
+    m_plans_list.emplace(std::piecewise_construct,
+                         std::forward_as_tuple(tid),
+                         std::forward_as_tuple(thread));
   bool RemoveTID(lldb::tid_t tid) {

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