Only initialize the streams cout/wcout/cerr/wcerr etc once, rather than any time Init::Init is called. Fixes PR#43300

llvm-svn: 371864

1 files changed, 17 insertions, 2 deletions

diff --git a/libcxx/src/iostream.cpp b/libcxx/src/iostream.cpp
index 0a5d6e8d226..ad1920abc65 100644
--- a/libcxx/src/iostream.cpp
+++ b/libcxx/src/iostream.cpp
@@ -97,7 +97,13 @@ static void force_locale_initialization() {
 #endif
 }
 
-ios_base::Init::Init()
+class DoIOSInit {
+public:
+	DoIOSInit();
+	~DoIOSInit();
+};
+
+DoIOSInit::DoIOSInit()
 {
     force_locale_initialization();
 
@@ -126,7 +132,7 @@ ios_base::Init::Init()
 #endif
 }
 
-ios_base::Init::~Init()
+DoIOSInit::~DoIOSInit()
 {
 #ifndef _LIBCPP_HAS_NO_STDOUT
     ostream* cout_ptr = reinterpret_cast<ostream*>(cout);
@@ -141,4 +147,13 @@ ios_base::Init::~Init()
     wclog_ptr->flush();
 }
 
+ios_base::Init::Init()
+{
+    static DoIOSInit init_the_streams; // gets initialized once
+}
+
+ios_base::Init::~Init()
+{
+}
+
 _LIBCPP_END_NAMESPACE_STD