Adopt @section and @used.
#1408
Open
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This PR adopts the
@sectionand@usedattributes now available in the Swift 6.3 toolchain. These attributes replace the experimental@_sectionand@_usedattributes verbatim and they are always enabled (so no need to checkhasFeature(SymbolLinkageMarkers).)Because these attributes are only available with the Swift 6.3 toolchain, we do not use them when building with Swift 6.2. Instead, if you build with Swift 6.2 you continue to use the "legacy" test discovery mechanism based on type metadata emission. The "legacy" mechanism will be removed in a future update.
Because the
_TestDiscoverytarget needs to continue to compile with Swift 6.2, I have not switched us over toobjectFormat()yet. See #1370 for details.Resolves #1371.
Checklist: