Fix std::span tests on linux #84774
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Fix std::span tests on linux #84774
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hnrklssn requested review from Xazax-hun, egorzhdan, fahadnayyar, j-hui, susmonteiro and zoecarver as code owners 
j-hui approved these changes Oct 8, 2025
| preset=buildbot_linux |
hnrklssn force-pushed the fix-std-span-linux branch from b7bcd95 to dd34be4 Compare | preset=buildbot_linux |
| @swift-ci please test |
Xazax-hun approved these changes Oct 9, 2025
hnrklssn requested review from bnbarham, hamishknight and rintaro as code owners 
This adds a check in CMake for whether the current C++ stdlib contains the 'span' header. If so, the llvm-lit feature 'std_span' is set. Also adds 'REQUIRES: std_span' to interop tests that include 'span'. This means we no longer have to choose between blanket disabling `std::span` tests on all Linux distributions, or listing every Linux distro with a libstdc++ version without `std::span` support as unsupported. rdar://161999160 rdar://161999174 rdar://162106580 rdar://162106619 rdar://162106643 rdar://162106653 rdar://162106722 rdar://162106747
hnrklssn force-pushed the fix-std-span-linux branch from ca22113 to edf402d Compare | @swift-ci please smoke test |
hnrklssn commented Oct 10, 2025
| endif() | ||
| | ||
| include(CheckIncludeFileCXX) | ||
| check_include_file_cxx("span" HAVE_STD_SPAN) |
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@etcwilde @egorzhdan Could you check my logic here - is this approach sound? Or does this need to be checked for every test target? Is CMake aware of multiple different SDKs when testing multiple different targets?
Perhaps I'm overthinking it - I never use multiple test targets, so that feature is a bit outside my wheelhouse. I can't think of a case where we would realistically test against one target without std::span and one with, but I thought I'd highlight it.
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