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

1 files changed, 3 insertions, 2 deletions

diff --git a/lldb/source/Host/windows/HostInfoWindows.cpp b/lldb/source/Host/windows/HostInfoWindows.cpp
index a965ec0ea4e..5b38e6021e0 100644
--- a/lldb/source/Host/windows/HostInfoWindows.cpp
+++ b/lldb/source/Host/windows/HostInfoWindows.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/Threading.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace lldb_private;
@@ -90,8 +91,8 @@ bool HostInfoWindows::GetHostname(std::string &s) {
 }
 
 FileSpec HostInfoWindows::GetProgramFileSpec() {
-  static std::once_flag g_once_flag;
-  std::call_once(g_once_flag, []() {
+  static llvm::once_flag g_once_flag;
+  llvm::call_once(g_once_flag, []() {
     std::vector<wchar_t> buffer(PATH_MAX);
     ::GetModuleFileNameW(NULL, buffer.data(), buffer.size());
     std::string path;