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TinyGo replaces crypto/tls with a stub whose handshake does nothing, so a program that dials https gets a plaintext connection behind the TLS API. That stub is correct for a target with no OS below it, which has neither the code size for a full TLS implementation nor usually a socket to speak it over. Hosted linux and macOS have both, and there the crypto/tls of the Go standard library compiles and runs. Make the override conditional. Without an entry in the map, crypto/tls falls under the "crypto/" merge, which links the package of the standard library into the synthetic GOROOT. GOOS alone cannot decide this, because a baremetal target reports GOOS=linux, so the build tags decide as well. The goroot cache key is a hash of the merge links, so the two variants get separate cache entries. testdata/hostcryptotls.go does a TLS handshake over an in-memory pipe with a certificate that it makes at run time. On the current dev branch it prints "negotiated an unexpected version: 0", because the stub does no handshake. With this change the handshake completes, the data goes through, and a client that does not trust the certificate refuses it. loader/goroot_test.go covers the targets that keep the stub, the baremetal one that reports GOOS=linux included.
This was referenced Sep 17, 2026
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Addresses #5696. The selected TLS stub reports success without a TLS handshake. Select Go's
crypto/tlson hosted Linux and Darwin. Other targets keep the stub.Depends on #5693 (PR #5698). Tests cover package selection, a real handshake, data exchange, and refusal of an untrusted certificate. Darwin callers must supply trust roots until #3592 is resolved.
#5645 closed on 5 September in favor of this work. #5204 tracks API gaps. #4273 covers a broader network package replacement.
Replaces #5635, closed on 17 September 2026 with a request for an issue first. Based on
devat93940cb6. Patches are unchanged after rebase. Formatting and whitespace checks pass. New runtime tests and CI are pending.