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build: a no-main entry namespace runs as a script instead of crashing

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jolt build -m ns on a namespace with only top-level side effects and no
-main produced a binary that printed its output, then crashed calling a nil
-main ("nil cannot be cast to IFn"). The launcher now calls -main only when
the entry ns actually defines one; otherwise the top-level forms (already run
at heap build) are the whole program and it exits cleanly. Regression case
added to build-smoke.sh.
This commit is contained in:
Yogthos 2026-07-04 10:18:57 -04:00
parent 403c3f302f
commit dbc5afac32
2 changed files with 25 additions and 3 deletions
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10
host/chez/build.ss
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@ -571,11 +571,17 @@
"))\n"
" (list \"jolt-core\" \"stdlib\"))))\n"))
(put-string out (string-append
" (let ((mainv (var-deref " (ei-str-lit entry-ns) " \"-main\")))\n"
;; Call -main only if the entry namespace defines one;
;; a script ns (top-level side effects, no -main) has
;; already run its forms at heap build, so invoking a nil
;; -main would crash ("nil cannot be cast to IFn") — just
;; exit cleanly instead.
" (let ((maincell (var-cell-lookup " (ei-str-lit entry-ns) " \"-main\")))\n"
;; render an uncaught throw (+ Clojure backtrace) instead
;; of Chez's opaque dump, then exit non-zero.
" (guard (v (#t (jolt-report-throwable v (current-error-port)) (exit 1)))\n"
" (apply jolt-invoke mainv args)))\n"
" (when (and maincell (var-cell-defined? maincell))\n"
" (apply jolt-invoke (var-cell-root maincell) args))))\n"
" (exit 0)))\n"))
(close-port out))
;; 4. compile -> boot -> link. Two paths, chosen by whether this process