Hi! I'm having some trouble with doing simple I/O actions in the clntsrv example (/src/l4/pkg/examples/clntsrv). I want the client to enter minuend and subtrahend himself, so I've added the following code to client.cc:

printf("Please enter minuend and subtrahend: \n"); l4_uint32_t val1, val2; std::cin >> val1 >> val2;

iostream is included at the beginning of the file. However, the linker has some serious problems:

==> Linking ex_clntsrv-client client.o: In function `main':

/home/hnr/l4re-core-2014022818/src/l4/pkg/examples/clntsrv/client.cc:60: undefined reference to `std::cin'

/home/hnr/l4re-core-2014022818/src/l4/pkg/examples/clntsrv/client.cc:60: undefined reference to `std::istream::operator>>(int&)'

/home/hnr/l4re-core-2014022818/src/l4/pkg/examples/clntsrv/client.cc:60: undefined reference to `std::istream::operator>>(int&)'

client.o: In function `__static_initialization_and_destruction_0': /home/hnr/l4reb/include/contrib/libstdc++-v3/iostream:72: undefined reference to `std::ios_base::Init::Init()' /home/hnr/l4reb/include/contrib/libstdc++-v3/iostream:72: undefined reference to `std::ios_base::Init::~Init()' make[1]: *** [ex_clntsrv-client] Error 1 make: *** [/home/hnr/l4reb/pkg/examples/clntsrv/OBJ-x86_586-l4f] Error 2

I did not change the Makefile, so g++ is used for compiling (and not gcc). I've added

CXX_FLAGS = -lstdc++ but that doesn't help.

I'm using update-alternatives to have different versions of g++ installed simultaneously. Currently, the link points to g++-4.7. But using g++-4.4 does not solve the problem either. Thanks in advance for support!