> Obviously completed faster. about 15sec.

I saw this thread a week ago and have set mold as the default for my Gentoo box 
now. Note that mold does not work with glibc and the Linux kernel, see 
<https://wiki.gentoo.org/wiki/Mold>

Actually mold seems to generate smaller executables, maybe by 2%, for 
Gentoo-LTO.

For your ./build_all.sh: Note that this command is generally only needed for 
the first fresh install. Updates can be done with
    
    
    cd Nim
    git pull
    ./koch boot -d:release
    ./koch tools
    
    
    Run

And that takes only a few seconds. That update procedure is a bit hidden in the 
documentation, but I assume devs know it.

For Nim app builds, I have seen no benefit of mold. My sdt app takes now 25 
seconds with or without mold, with recent devel compiler. I think one year ago 
it was only 12 seconds. This proves again the observation that software is 
always becoming slower.

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