Message-ID: <06dded2e-8650-4610-8813-5fa366e92114@gmail.com>
Date: Thu, 30 May 2024 21:12:54 +0200
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Subject: Re: gcc-14.1.0 DJGPP cross-compiler build for ArchLinux
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From: "J.W. Jagersma (jwjagersma AT gmail DOT com) [via djgpp-workers AT delorie DOT com]" <djgpp-workers AT delorie DOT com>
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On 2024-05-09 19:44, Andris Pavēnis (andris DOT pavenis AT iki DOT fi) [via djgpp-workers AT delorie DOT com] wrote:
> Tried to build GCC 14.1.0 as Linux -to-DJGPP cross-compiler in Arch Linux.
> 
> See https://aur.archlinux.org/packages/djgpp-gcc

Hi!

Will you be releasing djcross-gcc-*.tar.bz2 packages too again, or are
these patch files from AUR now the recommended way to build a
cross-compiler?

BTW, I don't see any tags/branches on your github yet for gcc-14, maybe
you forgot to push.

> Some short tests:
> 
> 1) small test program (gcc-14+ required, will not compile with gcc-13 or earlier versions, also c++20 or higher required)
> 
> #include <iostream>
> #include <chrono>
> 
> using namespace std::chrono;
> 
> $ cat test1.cpp
> #include <iostream>
> #include <chrono>
> 
> using namespace std::chrono;
> 
> int main(void)
> {
>     const time_zone* tz = locate_zone("Europe/Helsinki");
>     const time_zone* tz2 = locate_zone("Etc/UTC");
>     const auto local_time = tz->to_local(system_clock::now());
>     const zoned_time<nanoseconds> ldt(tz, local_time);
>     const zoned_time<nanoseconds> utc(tz2, ldt);
>     std::cout << std::format("{:%Y-%m-%d %H:%M:%S%Oz}", ldt) << std::endl;
>     std::cout << std::format("{:%Y-%m-%d %H:%M:%S%Oz}", utc) << std::endl;
>     return 0;
> }
> 
> Compiling:
> 
> i686-pc-msdosdjgpp-g++ -std=c++20 -O2 test1.cpp -o test1.exe
> 
> Copied EXE file to my ancient test notebook and tried: seems to work correctly when environment variable TZ is set (Europe/Helsinki in my case)
> 
> It is not getting time very accurately (10 ms step) however.

std::chrono stuff uses BIOS time via gettimeofday(), resolution is not
so great (55ms), very slow too.  Or did it change in gcc 14?  That
C++ time_zone stuff is completely independent from libc time, I think.

> Also tried to build https://aur.archlinux.org/packages/djgpp-djcrx-cvs for testing. Seems to work and records rather many GCC static analyzer messages (edited compiler options to remove -Werror and to enable static analyzer)
> 
> 
> Andris
> 
> 
>