Hi,
So, as some of you have noticed, I've submitted a bunch of -x86
packages to devel:toolchain, so I'd like to take a minute of your time
to explain what this does as it'll be a larger submission towards
Trunk:Testing. And I wanted to get everyone on the same page so
there's no problems when we do submit this.
As you know, ARM builds on OBS are horribly slow. Of course, some of
you remember old days where we didn't even have cross compilers, where
things were even worse :)
So, speedrpm is basically an extension to our current cross
compilation approach - where we using some tricks dump in X86 binaries
(including cross gcc and binutls) into an ARM chroot, where it
transparently replaces the ARM versions, so the compilation process
basically works like it's a native compile.
So, to justify these new packages, I'll quickly group them:
* rpm-x86 - this helps in general with build chroot setup, which is
now done (uncompression and all) by a X86 binary, making chroot setup
as fast as on X86. This was by far the biggest slowdown in ARM builds
* rpm-build-x86 - this accelerates when rpms are built ('Wrote:') phase.
* bzip2-x86, tar-x86, gzip-x86 - in a build process you are very often
running untar, un-bzip, un-gzip on big files, which is slow when the
de-compressor is running as an emulated ARM binary. This speeds up the
build root setup and very often also post-compilation process.
* coreutils-x86, sed-x86 - these tools usually involve a lot of string
processing which is also not useful to use X86 binaries in this,
speeds up general compilation and 'configure'
* file-x86 - many of you have spotted the brp-strip-static-archive
slowdown, where on big packages this seems to take ages. This speeds
up this phase by making 'file' a X86 binary.
* elfutils-x86 - this helps in the phase where debuginfo is extracted
and binaries stripped (eu-strip)
* diffutils-x86 - this helps in 'compare' phase, where the new built
RPM is compared to the old RPM, as 'diff' and 'cmp' is fast now.
rest are library dependancies for the binaries.
This has been tested on a copy of Trunk:Testing without any problems.
rpm-x86 has a minor problem with signature checking we're still
looking into ('warning: .init_b_cache/kernel-headers.rpm: Header V3
DSA/SHA1 Signature, key ID 79fc1f8a: NOKEY')
Best regards,
Carsten Munk
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