Switch std::call_once to llvm::call_once

Summary:
The std::call_once implementation in libstdc++ has problems on few systems: NetBSD, OpenBSD and Linux PPC. LLVM ships with a homegrown implementation llvm::call_once to help on these platforms.

This change is required in the NetBSD LLDB port. std::call_once with libstdc++ results with crashing the debugger.

Sponsored by <The NetBSD Foundation>

Reviewers: labath, joerg, emaste, mehdi_amini, clayborg

Reviewed By: labath, clayborg

Subscribers: #lldb

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D29288

llvm-svn: 294202

2 files changed, 6 insertions, 4 deletions

diff --git a/lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp b/lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp
index 50f787f7849..28068d9a1eb 100644
--- a/lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp
+++ b/lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp
@@ -30,6 +30,7 @@
 
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/Format.h"
+#include "llvm/Support/Threading.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include "DebuggerThread.h"
@@ -102,9 +103,9 @@ ProcessSP ProcessWindows::CreateInstance(lldb::TargetSP target_sp,
 }
 
 void ProcessWindows::Initialize() {
-  static std::once_flag g_once_flag;
+  static llvm::once_flag g_once_flag;
 
-  std::call_once(g_once_flag, []() {
+  llvm::call_once(g_once_flag, []() {
     PluginManager::RegisterPlugin(GetPluginNameStatic(),
                                   GetPluginDescriptionStatic(), CreateInstance);
   });
diff --git a/lldb/source/Plugins/Process/Windows/Common/ProcessWindowsLog.cpp b/lldb/source/Plugins/Process/Windows/Common/ProcessWindowsLog.cpp
index 242c1996bdd..3434808e94e 100644
--- a/lldb/source/Plugins/Process/Windows/Common/ProcessWindowsLog.cpp
+++ b/lldb/source/Plugins/Process/Windows/Common/ProcessWindowsLog.cpp
@@ -14,6 +14,7 @@
 #include "lldb/Core/StreamFile.h"
 #include "lldb/Interpreter/Args.h"
 #include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Threading.h"
 
 using namespace lldb;
 using namespace lldb_private;
@@ -25,12 +26,12 @@ using namespace lldb_private;
 static bool g_log_enabled = false;
 static Log *g_log = nullptr;
 
-static llvm::ManagedStatic<std::once_flag> g_once_flag;
+static llvm::ManagedStatic<llvm::once_flag> g_once_flag;
 
 void ProcessWindowsLog::Initialize() {
   static ConstString g_name("windows");
 
-  std::call_once(*g_once_flag, []() {
+  llvm::call_once(*g_once_flag, []() {
     Log::Callbacks log_callbacks = {DisableLog, EnableLog, ListLogCategories};
 
     Log::RegisterLogChannel(g_name, log_callbacks);