GNU bug report logs - #12741
build: cross-compiling: any cross-compile fails due to new

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: bug-coreutils <at> gnu.org
Cc: yegorslists <at> googlemail.com
Subject: any cross-compile fails due to new make-prime-list
Date: Fri, 26 Oct 2012 17:37:13 +0200

As reported privately by Yegor Yefremov:

    coreutils-8.20 has interesting issue. Have you tried to cross
    compile it for ARM? I get following error:

    GEN    src/primes.h
    /bin/sh: src/make-prime-list: cannot execute binary file
    make[1]: * [src/primes.h] Error 126

    because make-prime-list is also cross compiled. Any idea how to fix this?

Thanks for the bug report.  (forwarding it to the bug-coreutils list)
Yes, that is a problem when cross-compiling to any target.

I would like to generate that table with a portable awk script (maybe
even Perl).  If someone can provide such a script, I would be happy
to dump the C program.  That would solve the problem.

You can work around it by touching the executable, creating the generated
file on another system and copying it to your build directory.

Message #8 received at 12741 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Jim Meyering <jim <at> meyering.net>
Cc: 12741 <at> debbugs.gnu.org, yegorslists <at> googlemail.com
Subject: Re: bug#12741: any cross-compile fails due to new make-prime-list
Date: Fri, 26 Oct 2012 10:07:18 -0700

On 10/26/2012 08:37 AM, Jim Meyering wrote:
> I would like to generate that table with a portable awk script (maybe
> even Perl).  If someone can provide such a script, I would be happy
> to dump the C program.  That would solve the problem.

It'd be a pain to do it in portable awk, as it requires
arithmetic modulo (UINTMAX_MAX + 1), which Awk is not
likely to support directly.

Since there are only two or three plausible values of UINTMAX_MAX
these days, one possibility is to precompute primes.h for these
two or three values, and ship the precomputed primes.h in the
tarball, and to use the precomputed primes.h on hosts with typical
UINTMAX_MAX values.  People who are on a weird platform where
UINTMAX_MAX is an unusual value wouldn't be able to cross-compile,
but that's unlikely to ever happen and even if it does, we simply
add the unusual case to the precomputed primes.h.

Message #11 received at 12741 <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 12741 <at> debbugs.gnu.org, yegorslists <at> googlemail.com
Subject: Re: bug#12741: any cross-compile fails due to new make-prime-list
Date: Fri, 26 Oct 2012 19:27:42 +0200

Paul Eggert wrote:
> On 10/26/2012 08:37 AM, Jim Meyering wrote:
>> I would like to generate that table with a portable awk script (maybe
>> even Perl).  If someone can provide such a script, I would be happy
>> to dump the C program.  That would solve the problem.
>
> It'd be a pain to do it in portable awk, as it requires
> arithmetic modulo (UINTMAX_MAX + 1), which Awk is not
> likely to support directly.
>
> Since there are only two or three plausible values of UINTMAX_MAX
> these days, one possibility is to precompute primes.h for these
> two or three values, and ship the precomputed primes.h in the
> tarball, and to use the precomputed primes.h on hosts with typical
> UINTMAX_MAX values.  People who are on a weird platform where
> UINTMAX_MAX is an unusual value wouldn't be able to cross-compile,
> but that's unlikely to ever happen and even if it does, we simply
> add the unusual case to the precomputed primes.h.

That would be fine with me.
We were precomputing the "wheel.h" table of primes before, too.

If we go the route of distributing the generated file,
then we might as well resort to using Perl and say, -Mbigint,
to do generate all variants.

Message #16 received at 12741 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 12741 <at> debbugs.gnu.org
Subject: Re: bug#12741: any cross-compile fails due to new make-prime-list
Date: Tue, 6 Nov 2018 11:10:17 -0700

tags 12741 fixed
close 12741
stop

(triaging old bugs)

On 2012-10-26 11:27 a.m., Jim Meyering wrote:
> That would be fine with me.
> We were precomputing the "wheel.h" table of primes before, too.
> 
> If we go the route of distributing the generated file,
> then we might as well resort to using Perl and say, -Mbigint,
> to do generate all variants.

Starting with version 8.21, "prime.h" is pre-built and distributed.

Committed here:
https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=f16e251dae43117c2cd19359c26ce7b5e05165b6

As such, closing this bug.

-assaf

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