[Buildroot] [PATCH v2 2/2] Makefile: add check of binaries architecture

[Yann E. MORIN <yann.morin.1998@free.fr>]

Arnout, All,

On 2017-03-12 21:27 +0100, Arnout Vandecappelle spake thusly:
> On 12-03-17 18:49, Thomas Petazzoni wrote:
> 
> [snip]
> > +READELF_ARCH_NAME = $(call qstrip,$(BR2_READELF_ARCH_NAME))
> > +
> > +ifneq ($(READELF_ARCH_NAME),)
> 
>  We set it for all arches, so this is never empty. Except when we forget to set
> it, but in that case we probably want this thing to be executed so we notice.
> 
> > +define CHECK_BIN_ARCH
> > +	support/scripts/check-bin-arch $(TARGET_DIR) \
> > +		$(TARGET_CROSS) "$(READELF_ARCH_NAME)"
> > +endef
> > +TARGET_FINALIZE_HOOKS += CHECK_BIN_ARCH
> > +endif
> 
>  It would be nice to do it immediately after package install, so it becomes a
> package error rather than some post-build error that is more difficult to
> localise. Of course, with Yann's suggestion it would still report which package
> was the culprit, but I don't think it would show up in the autobuild results
> under the right package.
> 
>  To avoid too much overhead rechecking files all the time, it could be done as
> part of step_pkg_size_end which iterates over the files installed in target for
> that particular package. It would make the code a little more complicated,
> though, and perhaps also slower.

Or it could be a step after the step_pkg_size_end, which would basically
do:

    sed -r -e "/^${pkg},(.+)$/!d; s//\1/;" "${BUILD_DIR}/packages-file-list.txt

to get the list of file installed by the current package.

Of course, that would only really and cleanly work from a clean build.

> > +    farchname=$(${TARGET_CROSS}readelf -h ${f} | \

Please be sure to run it under the C locale, to be sure we can find what
we are looking for.

> > +		       grep '^  Machine:' | \
> > +		       sed 's/^  Machine: *\(.*\)/\1/')
> 
>  Why not the simpler sed -n '/^  Machine: *\(.*\)/s//\1/p' instead of the extra
> grep?

Or a bit easier to read (at least for me):

    readelf [..] |sed -r -e '/^  Machine: +(.+)/!d; s//\1/;'

Regards,
Yann E. MORIN.

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