[GR-77564] [BATCHED #24769] Separate builder and guest libc selection state#13998
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[GR-77564] [BATCHED #24769] Separate builder and guest libc selection state#13998graalvmbot wants to merge 1 commit into
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Keep the existing LibCBase API unchanged for builder and host-analyzed callers. Introduce a shared LibCKind value, rematerialize it in the guest context, and expose guest-owned folded predicates where runtime code is already guest-owned. Migrate PosixPlatformThreads to that guest state. Truffle NFI remains on its existing builder-folded LibCBase query until that code is migrated separately.
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Summary
This is a preparatory PR for GR-72850.
Separate authoritative builder libc selection from guest-owned selection metadata so runtime-owned POSIX code can be analyzed in an isolated guest context without reading the builder singleton.
LibCBasehierarchy and allHostedLibCBasetoolchain policy builder-owned and unchanged.LibCKindvalue and rematerializes it as a guest-ownedSubstrateGuestLibCsingleton.@GuestFoldpredicates to specialize libc-dependent runtime code while the image is built; the guest singleton is not a runtime callback into the builder.Commit Structure
The PR contains one coherent commit covering the shared identity value, explicit builder-to-guest transfer, guest singleton installation, POSIX thread call-site migration, and the required module dependency.
Scope
This PR intentionally transfers only libc identity. All state currently exposed by the non-hosted
LibCBaseimplementations is determined by that identity, while compiler selection, linker options, cross-compilation policy, C-binding filtering, and other hosted behavior remain in the builder. It does not move the libc hierarchy or native bindings and does not migrate Truffle NFI. The temporarycom.oracle.svm.core.posixdependency on SVM_GUEST_STAGING is tracked by GR-73521 and can be removed whenPosixPlatformThreadsmoves to guest-owned code.