Re: [Buildroot] [PATCH 1/1] package/guile: fix build on riscv32

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Fabrice, All,

On 2021-08-07 17:08 +0200, Fabrice Fontaine spake thusly:
> Le sam. 7 août 2021 à 10:53, Yann E. MORIN <yann.morin.1998@free.fr> a écrit :
> > On 2021-08-06 20:44 +0200, Fabrice Fontaine spake thusly:
> > > Fix the following build failure on riscv32:
> > > system/base/target.scm:132:16: In procedure triplet-pointer-size:
> > > unknown CPU word size "riscv32"
[--SNIP--]
> > > ++          ((string-match "^riscv.*" cpu) 8)
> > Are you sure that a 32-bit CPU will have 8-byte wide words? I would
> > have naturrally expected them to be just 4-byte wide...
> As I'm not an expert in riscv, I searched on wikipedia and here is an
> extract of https://en.wikipedia.org/wiki/RISC-V:
> "Memory is addressed as 8-bit bytes, with words being in little-endian order"
> It would be great if a riscv expert could confirm or not this information.

So, yes. Re-read that carefully:

  - 8-bit bytes. I.e. a byte is 8 bits

  - words being in little-endian order

That indeed says nothing about word size in bytes (not in bits!).

I might be wrong, but on a 32-bit arch, words are always 4-bytes wides,
i.e. 32 bits, while on a 64-bit architecutre, words are 8-byte wide,
i.e. 64 bits.

So, I would wager that riscv32 has 4-byte wide, ie 32-bit wide, words.

Regards,
Yann E. MORIN.

> > If htis is indeed the case, then please explain that in the patch commit
> > log...
> >
> > Regards,
> > Yann E. MORIN.
> >
> > > +           (else (error "unknown CPU word size" cpu)))))
> > > +
> > > + (define (triplet-cpu t)
> > > +--
> > > +2.30.2
> > > +
> > > --
> > > 2.30.2
> > >
> > > _______________________________________________
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> >
> > --
> > .-----------------.--------------------.------------------.--------------------.
> > |  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
> > | +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
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> > '------------------------------^-------^------------------^--------------------'
> Best Regards,
> 
> Fabrice

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 561 099 427 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'
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