Hi,

I'm trying to build gRPC v1.4.1 as following. I have all the required third 
party libraries built (with Clang and libc++) and installed (besides 
boringssl which is cloned inside third_party and built recursively).

I'm running make as following:

make HOST_CC=clang HOST_CXX="clang++ -stdlib=libc++ -std=c++11" CC=clang 
CXX="clang++ -stdlib=libc++ -std=c++11"

and I get an error during linkage of the protoc gRPC plugin:

[HOSTLD]  Linking /grpc-1.4.1/bins/opt/grpc_cpp_plugin

/usr/bin/ld: /grpc-1.4.1/objs/opt/src/compiler/cpp_plugin.o: undefined 
reference to symbol '_ZNSt3__18ios_base4initEPv'

//usr/lib/x86_64-linux-gnu/libc++.so.1: error adding symbols: DSO missing 
from command line

collect2: error: ld returned 1 exit status

make: *** [/grpc-1.4.1/bins/opt/grpc_cpp_plugin] Error 1

My constraint is that I really need to build with libc++. The whole thing 
does work if I build with libstdc++ (given protobuf is built with libstdc++ 
as well).

I really need your help here, thank you!

Alex

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