[DO NOT MERGE] probe macOS 27 runner labels - #658
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GitHub serves macOS 27 under the preview label xcode-27 (macOS 27.0 with Xcode 27, actions/runner-images#14404); there is no macos-27 label. Measured on #658: the label delivers macOS 27.0 (26A5406e), arm64, ImageOS macos27. - ci-macos and ci-macos-e2e run on macos-15 and xcode-27. - ci-fresh-install runs the xlings and Homebrew channels on macos-14 (the floor) and xcode-27 (the newest release). - Every macOS 27 leg asserts sw_vers major 27, because the label names an Xcode and its base OS has changed once. - setup-macos-llvm takes the image as an input and puts it in the xlings cache key, which named macos15 for every image.
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Measurement recorded in .agents/docs/2026-09-17-655-implementation-plan.md §5.1: the |
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…mpiler receives (#655); macOS 27 (#657) * One reading of a compile-flag element; the databases list what the compiler receives (#655) An element of `cflags`, `cxxflags` and `asmflags` now has one meaning on every host: the POSIX shell's word syntax without expansions, where a backslash escapes only a blank, a quote or a backslash (mcpp.manifest.flag_words, SPEC-004 §8). The ninja writer quotes each word for its host, and compile_commands.json and `mcpp emit build-database` list the words, so the databases equal the build by construction instead of re-reading command lines. Before, an element meant whatever the host's command-line reader made of it (measured on Linux and Windows runners, #656: five of fourteen spellings gave different macros), and the databases listed the text with a third reading, which is how libarchive's `-DPLATFORM_CONFIG_H=\"...\"` reached consumers with its backslashes. - A `defines` entry is one value: `N="x"` reaches the compiler as `-DN="x"` (it arrived as `-DN=x`). Features, globs, targets and `mcpp:cfg=` alike. - Link units keep their rendered text; GAS units' database entries list their edge's list; the `-std` guard, dialect promotion and include normalisation read words. - Windows `shell_quote_arg` doubles backslashes before a quote and the closing quote. - The first plan after an upgrade names an element whose words changed (`build/flag-words`); a repeated plan says nothing. No flag-list element of the published index changes. Tests: FlagWords.* (syntax table and round trip), CompileCommandsArgs.* (edge equals database, host quoting round trip, /bin/sh as the reference), e2e 736 (same assertions on every host; fails on 2026.9.16.2). Records: .agents/docs/2026-09-17-655-*. Version 2026.9.17.1. * 655: the ecosystem verification script * CI on macOS 27: ci-macos, ci-macos-e2e and both fresh-install channels GitHub serves macOS 27 under the preview label xcode-27 (macOS 27.0 with Xcode 27, actions/runner-images#14404); there is no macos-27 label. Measured on #658: the label delivers macOS 27.0 (26A5406e), arm64, ImageOS macos27. - ci-macos and ci-macos-e2e run on macos-15 and xcode-27. - ci-fresh-install runs the xlings and Homebrew channels on macos-14 (the floor) and xcode-27 (the newest release). - Every macOS 27 leg asserts sw_vers major 27, because the label names an Xcode and its base OS has changed once. - setup-macos-llvm takes the image as an input and puts it in the xlings cache key, which named macos15 for every image. * macOS 27: the std module builds; the -D compatibility rule; host-shaped test fixes macOS 27 (measured on the xcode-27 image, #659): the 27.0 SDK's math.h leaves INFINITY and NAN to <float.h> once modules are on, and clang 22's header does not supply them under -std=c++23, so libc++'s std module stopped building. apple_float_macro_words (hostflags.cppm) states both with the SDK's own GNU-mode spellings for clang on an Apple target; its readers quote the words their own way (ninja text, the std module command, graph std flags, build program argv). gnu++23, -U__STRICT_ANSI__ and -D__need_infinity_nan were rejected for their effect beyond the defect. The raw clang steps of ci-macos state the same words. Compatibility: an element beginning with -D or /D that contains a space is one word, verbatim, as every release since #234 passed it (SPEC-004 §8 rule 8). Windows: flag_element no longer quotes a backslash the syntax does not read as an escape, normalize_include_flags keeps the spelling of an unchanged element, and the split_flags quoting tests follow the host's reader. * CI macOS 27: wrap a bootstrap mcpp that predates the float macro fix The raw clang steps now build import std on macOS 27 (run 35142520288). The self-host step failed because the bootstrap, 2026.9.16.1, predates the fix. setup-macos-llvm wraps a bootstrap older than 2026.9.17.1 on macOS 27 or later and passes the same two words through CCC_OVERRIDE_OPTIONS; the freshly built binary runs unwrapped, and the wrapper retires with the bootstrap pin. * Review: the diagnostic block sits above the defines comment; correct the 252 claim; index reading with the -D exception - report_flag_words_changes was inserted between fold_build_defines_into_flags and its comment; it now precedes the comment. - The record claimed e2e 252 keeps its real old-client leg on macOS through the wrapper. It does not, on any macOS leg including main: MCPP_BOOT is the xlings shim. Corrected and listed as a residual, with dialect promotion reading words. - The index reading script applies the -D exception: 285 literals, 0 differ. --------- Co-authored-by: speak-agent <248744407+speak-agent@users.noreply.github.com>
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Measurement only: which of macos-27, macos-27-arm64, macos-26, macos-latest are served, and which macOS each runs. Closed after the readings are recorded.