Set C standard to C11

[LecrisUT]

TODO:

• Documentation

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +9.58 🎉

Comparison is base (fdcaafc) 76.48% compared to head (42c359d) 86.07%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #304      +/-   ##
===========================================
+ Coverage    76.48%   86.07%   +9.58%     
===========================================
  Files           22       23       +1     
  Lines         5576     6069     +493     
===========================================
+ Hits          4265     5224     +959     
+ Misses        1311      845     -466     

Flag	Coverage Δ
c_api	76.48% <ø> (ø)
fortran_api	37.46% <ø> (ø)
python_api	82.83% <ø> (?)
unit_tests	76.48% <ø> (ø)

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see 19 files with indirect coverage changes

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[atztogo]

@LecrisUT, are we waiting for windows test by #286?

[LecrisUT]

For this one? No it's self-contained and all ready. Just need documentation review.

[atztogo]

I asked because I have been bitten by windows compilers number of times in old days. So I may be relaxed if I could see this PR passes on windows compilers.

[LecrisUT]

I asked because I have been bitten by windows compilers number of times in old days. So I may be relaxed if I could see this PR passes on windows compilers.

Oh in that sense. Sure this one is already a dependency for most of the PRs, #286 included. And indeed for that one the tests are passing (except the flakiness bug that I'm slowly trying to address with #303, #297 and other test improvements)

[LecrisUT]

Ok, see #286. Windows tests are passing with the C11 even on pytest 🎉. I have confirmed that the correct compiler is used in https://github.com/spglib/spglib/actions/runs/5319593736

[lan496]

LGTM! The newer standard will make our lives easier.

[LecrisUT]

Hmm, it didn't allow to set an auto-merge, maybe it only has an effect on future PRs.