Create cross wayland-scanner for toolchain or cross-development environment

[Pekka Paalanen]

On Mon, 5 Dec 2016 14:13:23 +0300
Andrew Kosteltsev <kosteltsev at gmail.com> wrote:

> Hi guys,
> 
> This is no versioning question. I think when the host,target is not equal
> to build (I mean configure options --build,--taget,--host) we can compile
> two scanners:

Sorry, indeed, this thread was hijacked for the versioning discussion,
because it really matters which version of the scanner you happen to
use.

> 1) scanner built by cross compiler and has original name (wayland-scanner)
> 2) scanner built by BUILD_CC and has complex name, for example,
> arm-xxx-linux-gnueabihf-wayland-scanner (this scanner can be in the non
> install binaries list)
> 
> That is all.
> 
> In this case the engineer who prepare the package can make decision about
> installation the second scanner into his development environment (in the
> same way as cross-compiler in his toolchain) to be able using this
> build-machine scanner for build other packages for the same target machine.
> 
> I think it is not too complex but allows to build sources in one stage.

Right, but your patch seems to add quite a lot of open-coded stuff that
should come from automake internals, IMO. Personally I would not be too
comfortable landing that - it is complicated code that bypasses
automake somewhat. It looks like it will always build the scanner twice
even for native builds, and I think it also breaks the "host scanner"
option.

OTOH, you currently can (right?) build Wayland twice out-of-tree, first
configured for the build, the second configured for the host. It uses
the same common automake build code that is always used. You always
have at least some step for making the build scanner available. Anyway,
all that you write up in some meta-build system once, so the saved
effort is minimal.

There's some movement towards Meson, which would also solve the
cross-build issue.


Thanks,
pq
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