Re: unhandled constant?

[David Kastrup <dak@gnu.org>]

Han-Wen Nienhuys <hanwenn@gmail.com> writes:

> +lilypond-devel for visibility.
>
> On Sat, Feb 1, 2020 at 10:54 AM Han-Wen Nienhuys <hanwenn@gmail.com> wrote:
>>
>> Here is an example that shows better how things work, and what might
>> be the cause of my problems. Is it right that programmatically set
>> contents of "current-module" are not serialized into the compiled
>> file?
>>
>>    (define (run-at-compile-time cmd)
>>      (module-define! (current-module) (string->symbol cmd) #t)
>>      (format (current-error-port) "I-am-called-at-compile-time ~a\n" cmd))
>>
>>   (define (runtime-call cmd)
>>     (format (current-error-port) "I-am-called-at-runtime ~a\n" cmd)
>>     (format (current-error-port) "val ~a\n"
>>             (module-ref (current-module) (string->symbol cmd))))
>>
>>   (defmacro foo (cmd . rest)
>>   (run-at-compile-time cmd)
>>   `(runtime-call ,cmd))
>>
>>   (foo "xy")
>>
>> $ guile1.8 ew.scm
>> I-am-called-at-compile-time xy
>> I-am-called-at-runtime xy
>> val #t
>>
>> this is compatible with 2.2 without compilation,
>>
>> $ GUILE_AUTO_COMPILE=0 guile2.2 ew.scm
>> I-am-called-at-compile-time xy
>> I-am-called-at-runtime xy
>> val #t
>>
>> but compilation fails
>>
>> $ GUILE_AUTO_COMPILE=1 guile2.2 ew.scm
>> ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
>> ;;;       or pass the --no-auto-compile argument to disable.
>> ;;; compiling /home/hanwen/vc/lilypond/ew.scm
>> ;;; WARNING: compilation of /home/hanwen/vc/lilypond/ew.scm failed:
>> ;;; Unbound variable: run-at-compile-time
>>
>> $ guild2.2 compile ew.scm
>> Backtrace:
>> In system/base/target.scm:
>>      57:6 19 (with-target _ _)
>> In system/base/compile.scm:
>> ..
>> Unbound variable: run-at-compile-time
>>
>>
>> If I encapsulate the run-at-compile-time definition with
>>
>>  (eval-when
>>   (compile eval)
>>
>> it works if I remove the module manipulation, but the module-ref
>> doesn't work. It looks like the settings from module-define! are not
>> serialized into the byte code, so I can't have code that relies on
>> correspondence between module-define driven from macros and module-ref
>> during evaluation.
>>
>> [hanwen@localhost lilypond]$ guild2.2 compile ew.scm
>> I-am-called-at-compile-time xy
>> wrote `/home/hanwen/.cache/guile/ccache/2.2-LE-8-3.A/home/hanwen/vc/lilypond/ew.scm.go'
>> [hanwen@localhost lilypond]$ GUILE_AUTO_COMPILE=0 guile2.2 ew.scm
>> I-am-called-at-runtime xy
>> Backtrace:
>>            6 (apply-smob/1 #<catch-closure 56514b4c37a0>)
>> In ice-9/boot-9.scm:
>>     705:2  5 (call-with-prompt ("prompt") #<procedure 56514b4d5c60 …> …)
>> In ice-9/eval.scm:
>>     619:8  4 (_ #(#(#<directory (guile-user) 56514b591140>)))
>> In ice-9/boot-9.scm:
>>    2312:4  3 (save-module-excursion #<procedure 56514b54b330 at ice-…>)
>>   3832:12  2 (_)
>> In ew.scm:
>>     10:10  1 (runtime-call "xy")
>> In unknown file:
>>            0 (scm-error misc-error #f "~A ~S ~S ~S" ("No variabl…" …) …)
>>
>> ERROR: In procedure scm-error:
>> No variable named xy in #<directory (guile-user) 56514b591140>
>>

But that is not using a local define at all.  Can you point out the
actual code that failed for you?

-- 
David Kastrup