The Ubuntu 16.04 environment is being removed by github
on September 20, 2021. They will induce 'brownouts'
starting from September 6 to get clients to move on.
This change removes testing of GCC versions prior to 4.8,
and clang versions prior to 3.9
Ref: https://github.com/actions/virtual-environments/issues/3287
Add explicit "apt-get update" for all test cases which uses "apt-get".
- It may help to stabilize fetching from apt archive.
As for "CC=gcc-11"
- Add "g++-11" package.
- "g++-11" has been removed from the default virtual environment.
https://github.com/actions/virtual-environments/issues/3467
## Added compilers
- gcc: 4.[4678], 5, 6, 11
- clang: 3.[56789], 4, 5, 12
## Known issue
- make -C tests test-lz4c32
- Fails with all versions of clang. See #991 for details.
- CFLAGS='-O3 -mx32' make -C tests test-lz4c32
- Fails with all versions of clang
- Fails with gcc-11
- `make cxxtest`
- Disabled for now. Will be enabled after #993.
- `make c_standards_c90`, `make c_standards_c11`
- Disabled for now. Will be enabled after #994.
## Difference with `.travis.yml`
The following tests are not included yet.
- name: Compile OSS-Fuzz targets
- name: tag build
The following tests won't be included due to lmitation of the CI environment.
- name: aarch64 real-hw tests
- name: PPC64LE real-hw tests
- name: IBM s390x real-hw tests
Except above, all other features in `.travis.yml` has been included in this change set.
The following post describes details.
