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rename <stdatomic.h> to <__msvc_cxx_stdatomic.h> #3183

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barcharcraz merged 7 commits into from
Oct 27, 2022
Merged

rename <stdatomic.h> to <__msvc_cxx_stdatomic.h> #3183

barcharcraz merged 7 commits into from
Oct 27, 2022

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@barcharcraz
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@barcharcraz barcharcraz commented Oct 26, 2022

we are adding C11 atomics support to the compiler/vcruntime. because of this <stdatomic.h> needs to become part of vcruntime. This PR renames the STL's "compatibility" stdatomic.h to __msvc_cxx_stdatomic.h and updates references to stdatomic.h to instead point to __msvc_cxx_stdatomic.h. The "real" stdatomic.h is added to vcruntime in an internal mirror of this PR: MSVC-PR-423692, and it simply includes either __msvc_cxx_stdatomic.h or vcruntime_c11_stdatomic.h depending on __cplusplus.

The one inclusion of "stdatomic.h" in our tests was updated, so our tests should continue to pass, even if the runtime used to build the STL does not have stdatomic.h.

@barcharcraz barcharcraz requested a review from a team as a code owner October 26, 2022 20:53
@CaseyCarter CaseyCarter added the enhancement Something can be improved label Oct 26, 2022
@StephanTLavavej StephanTLavavej self-assigned this Oct 26, 2022
@CaseyCarter CaseyCarter added the high priority Important! label Oct 26, 2022
@barcharcraz barcharcraz force-pushed the dev/chbarto/rename_stdatomic.h branch from 458ba0a to 43225db Compare October 26, 2022 22:33
CaseyCarter
CaseyCarter reviewed Oct 26, 2022
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frederick-vs-ja commented Oct 27, 2022

I think this error message will be confusing after the changes. It still says <stdatomic.h>, but if one include <stdatomic.h> in C11/17 mode (after the corresponding changes in vcruntime), this #error won't be encountered.

Perhaps we should say something like <__msvc_cxx_stdatomic.hpp> is an internal header. It is incompatible with C and should not be directly included..

STL/stl/inc/__msvc_cxx_stdatomic.hpp

Lines 13 to 16 in 996ad1f

// provide a specific error message for C compilers, before the general error message in yvals_core.h
#ifndef __cplusplus
#error <stdatomic.h> is not yet supported when compiling as C, but this is planned for a future release.
#endif // __cplusplus

@CaseyCarter CaseyCarter mentioned this pull request Oct 27, 2022
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CaseyCarter commented Oct 27, 2022

I think this error message will be confusing after the changes.

I agree the error message is now bad. I'd prefer that we fix it in a followup PR rather than this one given that we have a few hours to make 17.5p2 and we're still fighting to get a clean internal test run. I've filed #3184 to ensure we don't forget to follow up.

@barcharcraz barcharcraz merged commit c873cf0 into microsoft:main Oct 27, 2022
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@StephanTLavavej StephanTLavavej StephanTLavavej approved these changes

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@barcharcraz @frederick-vs-ja @CaseyCarter @StephanTLavavej