Regression: AOT stream_isatty() link fails — undefined __compiler_stream_isatty (re-#6035, ext/standard/streamsfuncs.c)

[PurHur]

Category

Regression · php-src-strict · AOT · pillar 4

Problem

VM/JIT stream_isatty(STDOUT) match Zend (false for non-TTY / harness). Thin AOT fails to link with undefined __compiler_stream_isatty — the symbol is declared in lib/JIT/Builtin/Type.php / JitStreamIsatty but not emitted into the linked object under helper-runtime cache. Prior #6035 closed VM registration only. Probed 2026-08-04 @ 4639761bd.

Repro	Zend / VM / JIT	AOT (phpc build)
stream_isatty(STDOUT)	false (non-TTY)	link error: undefined reference to __compiler_stream_isatty

php-src reference

• php/php-src ext/standard/streamsfuncs.c — PHP_FUNCTION(stream_isatty) / php_stream_isatty
• php/php-src ext/standard/basic_functions.stub.php — stream_isatty

PHP implementation target

• Ensure __compiler_stream_isatty body is emitted/linked for thin AOT (ext/standard/StreamCapsJitHelper.php, JitStreamIsatty.php, lib/JIT/Builtin/StreamCaps*.php) — PHP-in-PHP; no new runtime/*.c
• Prefer fixing helper-runtime / NestedJIT registration so the declared LLVM symbol has a real definition

Repro

./script/docker-exec.sh -- bash -lc '
cat > /tmp/isatty.php <<'"'"'PHP'"'"'
<?php
var_export(stream_isatty(STDOUT));
echo "\n";
PHP
php bin/vm.php /tmp/isatty.php
php bin/jit.php /tmp/isatty.php
php bin/compile.php -o /tmp/isatty.bin /tmp/isatty.php
'

Done when

• AOT links and prints same as VM/JIT for STDOUT / php://memory (non-TTY → false)
• stream_isatty(null) catchable TypeError under AOT (same message as VM)
• Targeted repro/compliance guard; php-src-strict; no new C in runtime/

Gate context (same machine, 2026-08-04)

• Inventory OK 6999/6999; user_release_ready: no (stale Ceil/Floor helper-runtime + north-star5-fast gen-0 mismatch Self-host M5: bootstrap-inventory argv driver size floor — grow beyond 451KB stub #8713)

[PurHur]

Maintainer pillar probe (filed with this issue)

Gate	Result	Symptom
bootstrap-inventory --check	green	OK 6999/6999
release-readiness --json	red	user_release_ready: no
helper-runtime-prelink	red	STALE CeilJitHelper + FloorJitHelper (post-#27653)
north-star5-verify --fast	red	4f-m gen-0 manifest/driver mismatch (#8713)
gen-0 provenance	stale	5 lowering commits since driver 649f3f478
vm-driver / cold-build / spine / gen0-functional	green

#10533 comments locked (2500+); probe recorded here. Sibling filings: #27658 password_algos empty AOT, #27659 stream_get_meta_data AOT keys.

[PurHur]

claim: PHP Compiler STD Lib — starting this run

[PurHur]

Merged via #27695.

Fix: JitStreamIsatty::invoke() lazy-links StreamCaps::ensureLinked() before calling __compiler_stream_isatty (same pattern as JitStreamSupports). Thin user-script AOT skips eager linking in Type::initialize.

Verified (Docker):

• Issue repro: VM/JIT/AOT all print false for stream_isatty(STDOUT)
• test/repro/stream_isatty_6035.php AOT: 1\n0\n
• phpunit --filter StreamCapsRuntime: 13/13 OK

Not run: ci-fast, bootstrap-selfhost-link, compliance shards.