[apache/incubator-teaclave-sgx-sdk] WIP: Fix sgx cov (#309)

[Yu Ding <no...@github.com.INVALID>]

changes:

- fixed sgx_cov in `nightly-2020-10-25`, which provides `llvm-cov-11`
- probe `gcov` and `llvm-cov` version heuristically. `gcov` <= 7 and `llvm-cov` >= 11 supported
You can view, comment on, or merge this pull request online at:

  https://github.com/apache/incubator-teaclave-sgx-sdk/pull/309

-- Commit Summary --

  * fix sgx-cov to be compatible with LLVM 10 profiler API
  * Update readme. add gcov version requirement
  * temp fail cannot find final.info
  * cov: fix Makefile and support llvm-cov-12

-- File Changes --

    M samplecode/sgx-cov/Makefile (1)
    M samplecode/sgx-cov/Readme.md (16)
    M samplecode/sgx-cov/enclave/enclave-cov-rustc (0)
    M samplecode/sgx-cov/enclave/llvm-gcov (57)
    M sgx_cov/lib.rs (237)

-- Patch Links --

https://github.com/apache/incubator-teaclave-sgx-sdk/pull/309.patch
https://github.com/apache/incubator-teaclave-sgx-sdk/pull/309.diff

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Re: [apache/incubator-teaclave-sgx-sdk] WIP: Fix sgx cov (#309)

[Yu Ding <no...@github.com.INVALID>]

@volcano0dr please help on xargo support. currently sgx-cov sample does not compile on `XARGO_SGX=1 make COV=1`:

```
error: the crate `panic_abort` does not have the panic strategy `abort`
```


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Re: [apache/incubator-teaclave-sgx-sdk] Fix sgx cov (#309)

[Yu Ding <no...@github.com.INVALID>]

Merged #309 into master.

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