[bootstrappable] Re: Can Guile be bootstrapped from source without psyntax-pp.scm?
- From: Michael Schierl <schierlm@xxxxxx>
- To: Jan Nieuwenhuizen <janneke@xxxxxxx>
- Date: Sun, 14 Mar 2021 15:18:13 +0100
Hello Jan,
Am 14.03.2021 um 14:57 schrieb Jan Nieuwenhuizen:
Michael Schierl writes:
Hello,
For the record, I have written a psyntax implementation that can be used
by Guile (3.0.2) and does not require an expanded version of itself.
Oh, that's amazing! I see that you are using make-syntax-transformer
(and others) which GNU Mes does not support yet; it only has
define-macro. This may be a good reason/opportunity to work towards
better Guile support in Mes.
In fact, I use make-syntax-transformer only because Guile does not have
native define-macro support (it uses psyntax to emulate it).
When there is native define-macro support, you can replace step1.scm by
(define s1*-define-macro define-macro)
(define-macro (s1*-expand-with-side-effects seff1 body seff2)
(list '(lambda (a b . c) (apply values b))
seff1
(list 'call-with-values (list 'lambda '() body)
'(lambda rest rest))
seff2))
which will make the bootstrap even shorter.
Probably you should validate whether the evaluation order is right so
that s1*-expand-with-side-effects will really expand the side effect 1
before the body and side effect 2 after the body (there is an example in
psyntax-bootstrapping.scm line 76 which should display 1 2 3 and return 42).
You can skip step 2 as well, as you already have a quasiquote expander
that does not rely on psyntex.
The further steps up to step 7 will not use make-syntax-transformer, it
will come back in step 8 (patched psyntax.scm). But probably for step 8
you would have to patch your own psyntax.scm instead of patching guile's
version anyway.
Regards,
Michael
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