[Based on #2090] runtime: support Go 1.26 in C libraries#2098
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Store each immutable Func as one atomic pointer and validate the queried PC from the Func itself. This prevents concurrent cache replacement from combining a PC and function from different writers. Apply the same publication rule to the prebuilt function cache and stress multiple PCs during concurrent first use.
Give each package-backed locality block an owner-local TLS cache so hot accesses are O(1) regardless of the number of touched packages. Keep the block list only for GC reachability and teardown. Require locality variables to be unexported and reject go:linkname aliases. Add codegen, lifecycle, and 2/4/8-package performance coverage.
Provide the synctest, Darwin CPU, Linux gettimeofday, and all-thread syscall hooks required by Go 1.26 standard-library code in c-shared and c-archive builds. Extend the export demo so C consumers link and execute fmt, goroutine, syscall, funcinfo, and explicit DWARF paths in both library modes.
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Problem
Go 1.26 standard-library code retained by
c-sharedandc-archiveneeds runtime hooks LLGo did not provide. This caused unresolved symbols on Darwin. On Linux, the generated shared-library constructor was lowered to legacy.ctors, so it did not initialize the runtime or reflection ABI tables before C first called an exported Go function; the export demo then crashed infmt.Sprintf.Fix
c-sharedconstructor in.init_array; keep platform constructor lowering forc-archiveand Darwinfmt.Sprintf, goroutines, funcinfo, platform syscall paths, and explicit DWARF lookup from real C consumersThis PR is based on #2090 (and transitively #2079). The broader 176-package standard-library coverage remains in a separate follow-up.
Validation
c-sharedandc-archivebuild, C link, execution, funcinfo, and DWARF checks passinternal/build: 73.7% statement coveragecmd/internal/test: 72.8% statement coverageCloses #2096