[Buildroot] [PATCH 1/1] package/guile: fix build on riscv32
Yann E. MORIN
yann.morin.1998 at free.fr
Sat Aug 7 17:12:49 UTC 2021
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 at 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 | ___ |
> > | +33 561 099 427 `------------.-------: X AGAINST | \e/ There is no |
> > | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL | v conspiracy. |
> > '------------------------------^-------^------------------^--------------------'
> 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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