Merge remote-tracking branch 'dgq/fix-grpc-lib' into make_clang_great_again_v2

include/grpc++/impl/grpc_library.h

@@ -58,9 +58,13 @@ static CoreCodegen g_core_codegen;
 class GrpcLibraryInitializer GRPC_FINAL {
  public:
   GrpcLibraryInitializer() {
+    if (grpc::g_glip == nullptr) {
       grpc::g_glip = &g_gli;
+    }
+    if (grpc::g_core_codegen_interface == nullptr) {
       grpc::g_core_codegen_interface = &g_core_codegen;
     }
+  }
 
   /// A no-op method to force the linker to reference this class, which will
   /// take care of initializing and shutting down the gRPC runtime.

src/cpp/client/secure_credentials.cc

@@ -60,8 +60,7 @@ std::shared_ptr<grpc::Channel> SecureChannelCredentials::CreateChannel(
 
 SecureCallCredentials::SecureCallCredentials(grpc_call_credentials* c_creds)
     : c_creds_(c_creds) {
-  internal::GrpcLibraryInitializer gli_initializer;
+  g_gli_initializer.summon();
-  gli_initializer.summon();
 }
 
 bool SecureCallCredentials::ApplyToCall(grpc_call* call) {