On 2017-10-27 12:12 +0000, Hugh McMaster wrote:
> Hi Wookey,
>
> Apologies for the delayed response.
>
> On Thursday, 26 October 2017 12:23 AM, Wookey wrote:
> >> The header was previously installed with other headers in /usr/include/<package>.
> >> Due to the conflict, I've modified debian/rules to:
> >> 1. Override dh_auto_install,
> >> 2. Create a directory in debian/tmp/usr/include/<triplet>/<package>
> >> using mkdir -p; and
> >> 3. Move the conflicting header to the newly created directory using mv.
>
> > OK, that sounds sensible, presuming that the header _should_ be arch-dependent.
> >The alternative is to fix up the header so it's no longer arch-dependent.
>
> The header contains an arch-specific path to Python plugins.
Right - the way to make such headers arch-independent is typically to
have a list of #ifdefs for paths and arches. It's up to you whether
you prefer one (ugly) arch-indepedent file or lots of mucvh cleaner
arch-specific files.
> > This is because the debian toolchain puts both
> > /usr/include, and /usr/include/${DEB_HOST_MULTIARCH} on the system search path so a
> > #include <package/header.h> should find header.h in both
> > /usr/include/package/ and /usr/include/${DEB_HOST_MULTIARCH}/package/
> >or at least I think that's how it's expected to work.
>
> I tested this and can confirm that your explanation is correct.
> Headers are found in both of those directories.
Cool. I meant to test it, but ran out of time and posted
anyway. Thanks for confirming.
> > How exactly are you testing this?
> I was including the header directly; i.e. without the package prefix.
> That didn't work; hence this email to the D-Mentors list.
>
> Replacing
> #include <parser.h>
> with
> #include <package/parser.h>
> allowed gcc to find the header, even though it was installed in the multi-arch include path.
This should probably be explained on a wiki page somewhere, probably
this packager-oriented one
https://wiki.debian.org/Multiarch/Implementation and or this usage-oriented one:
https://wiki.debian.org/Multiarch/HOWTO
Wookey
--
Principal hats: Linaro, Debian, Wookware, ARM
http://wookware.org/
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