topic Re:What configuration can cause error when resolving libcxx dependencies? in Intel® Software Guard Extensions (Intel® SGX)

What configuration can cause error when resolving libcxx dependencies?

l_r — Fri, 26 Feb 2021 20:38:30 GMT

I have started to work on an already existing SGX Application, with an already existing Makefile, that is for 90% the same as the one in the CXX11SGXDemo, but of course has some modifications (Important ones below).

I wanted to use some standard c++ classes (like vector), and I can compile the small snippets that I wrote when I include them in the CXX11SGX Demo, but In this project, the linker gives the error

/usr/bin/ld: Udfs/extended-data-types.o: in function `std::__1::vector<row_t, std::__1::allocator<row_t> >::allocate(unsigned long)':
/home/leonhard/sgx/sdk/sgxsdk/include/libcxx/vector:930: undefined reference to `std::__1::__vector_base_common<true>::__throw_length_error() const'
/usr/bin/ld: Udfs/extended-data-types.o: in function `std::__1::allocator<row_t>::allocate(unsigned long, void const*)':
/home/leonhard/sgx/sdk/sgxsdk/include/libcxx/memory:1740: undefined reference to `std::bad_alloc::bad_alloc()'

Which is what I get when I try to include the line

auto* rows = new std::vector<row_t>(underlying->tuples, underlying->tuples + underlying->num_tuples * sizeof(row_t));

Other small snippets in the similar spirit cause similar errors, all in relation to exceptions from <new> or <stdexcept>

The biggest difference in the makefile are (probably) the link flags:

Enclave_Link_Flags := $(Enclave_Security_Link_Flags) \
    -Wl,--no-undefined -nostdlib -nodefaultlibs -nostartfiles -L$(SGX_TRUSTED_LIBRARY_PATH) \
   -Wl,--whole-archive -l$(Trts_Library_Name) -Wl,--no-whole-archive \
   -Wl,--whole-archive -lsgx_tcmalloc -Wl,--no-whole-archive \
   -Wl,--start-group  -lsgx_tstdc -lsgx_tcxx -lsgx_omp -lsgx_pthread -lsgx_tkey_exchange -l$(Crypto_Library_Name) \
                  -l$(Service_Library_Name) -Wl,--end-group \
   -Wl,-Bstatic -Wl,-Bsymbolic -Wl,--no-undefined \
   -Wl,-pie,-eenclave_entry -Wl,--export-dynamic  \
   -Wl,--defsym,__ImageBase=0 -Wl,--gc-sections   \
   -Wl,--version-script=Enclave/Enclave.lds

Is there anything that has to be configured differently?

Re:What configuration can cause error when resolving libcxx dependencies?

JesusG_Intel — Fri, 26 Feb 2021 21:44:10 GMT

Hello l_r,

How closely are you following the Cxx11SGXDemo?

To help us troubleshoot, send your full Makefile.

Did you remember to source the sgxsdk/environment file?

Sincerely,

Jesus G.

Intel Customer Support

Re:What configuration can cause error when resolving libcxx dependencies?

JesusG_Intel — Fri, 05 Mar 2021 00:01:08 GMT

Hello l_r,

Do you still need help with this issue?

You should follow Cxx11SGXDemo as closely as possible.

To help us troubleshoot, send your full Makefile.

Sincerely,

Jesus G.

Intel Customer Support

Re:What configuration can cause error when resolving libcxx dependencies?

JesusG_Intel — Mon, 08 Mar 2021 21:56:46 GMT

Hello l_r,

We have not heard from you in several days so we will no longer monitor this thread. We hope you were able to resolve your issue. Please start a new thread if you need further help.

Intel is no longer monitoring this thread. If you want a response from Intel in a follow-up question, please open a new thread.