Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44568
By `lcov`, we can generate beautiful html. It's better than current file report and line report. Therefore in oss gcc, remove `export` code and `file/line level report` code, only use the html report.
But in clang, since such tool is not available, we will still use file-report and line-report generated by ourself.
Test Plan:
Test in docker ubuntu machine.
## Mesurement
1. After running `atest`, it takes about 15 mins to collect code coverage and genrate the report.
```
# gcc code coverage
python oss_coverage.py --run-only=atest
```
## Presentation
**The html result looks like:**
*Top Level:*
{F328330856}
*File Level:*
{F328336709}
Reviewed By: malfet
Differential Revision: D23550784
fbshipit-source-id: 1fff050e7f7d1cc8e86a6a200fd8db04b47f5f3e
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43890
1. auto-detect `CXX` default compiler type in oss, and `clang` as default compiler type in fbcode (because auto-detecting will say `gcc` is the default compiler on devserver).
2. change `compiler type` from str `"CLANG" "GCC"` to enum type
3. rename function `get_cov_type` to `detect_compiler_type`
4. auto-set the default pytorch folder for users in oss
Test Plan:
on devserver:
```
buck run :coverage //caffe2/c10:
```
on oss:
```
python oss_coverage.py --run-only=atest
```
Reviewed By: malfet
Differential Revision: D23420034
fbshipit-source-id: c0ea88188578bb1343a286f2090eb8a74cdf3982
