Hi,
We're using a Rust library which depends on `rust-gmp` which also depends on
`libgmp`. We are able to produce `enclave.so` by linking the `libgmp`. But in
the last phase, during the signing process, we get the following error:
```bash
LINK => enclave/enclave.so
mkdir -p bin
<!-- Please refer to User's Guide for the explanation of each field -->
<EnclaveConfiguration>
<ProdID>0</ProdID>
<ISVSVN>0</ISVSVN>
<StackMaxSize>0x40000</StackMaxSize>
<HeapMaxSize>0x100000</HeapMaxSize>
<TCSNum>1</TCSNum>
<TCSPolicy>1</TCSPolicy>
<DisableDebug>0</DisableDebug>
<MiscSelect>0</MiscSelect>
<MiscMask>0xFFFFFFFF</MiscMask>
</EnclaveConfiguration>
[check_symbol_table elfparser.cpp:253] symbol '__gmpz_cmp' is undefined
Symbol table incorrect
The input enclave file is not correct.
Error happened while signing the enclave.
Makefile:134: recipe for target 'bin/enclave.signed.so' failed
make: *** [bin/enclave.signed.so] Error 255
```
Is there a solution to this problem?
@dingelish
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