On Tue, 2019-02-19 at 02:05 +0900, Masahiro Yamada wrote:
[...]
> "make allnoconfig; make bindeb-pkg"
> failed on Ubuntu 16.04, but succeeded on Ubuntu 18.04
>
> I am puzzled...
[...]
> dpkg-buildpackage: host architecture i386
> dpkg-source --before-build linux
> dpkg-checkbuilddeps: error: Unmet build dependencies: flex
> dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
> dpkg-buildpackage: warning: (Use -d flag to override.)
> scripts/package/Makefile:78: recipe for target 'bindeb-pkg' failed
> make[1]: *** [bindeb-pkg] Error 3
> Makefile:1390: recipe for target 'bindeb-pkg' failed
> make: *** [bindeb-pkg] Error 2
>
>
> The docker file I used is below.
>
> If I change "FROM ubuntu:16.04" to "FROM ubuntu:18.04",
> it goes well.
[...]
For a cross-build, some build-dependencies may need to belong to the
host architecture (what the package will run on) while others do not.
In general, they must do one of:
(a) Belong to the host architecture
(b) Belong to any architecture, and include "Multi-Arch: foreign" in
their own metadata
(c) Belong to an architecture specified in the Build-Depends field
We normally want (b) for tools like flex. But flex is (I assume)
missing the Multi-Arch field in Ubuntu 16.04, as it used to in Debian.
The way we dealt with this in Debian before flex was fixed was (c): use
"flex:native". But for reasons I don't understand that *isn't*
compatible with (b), so to be compatible with both old and new versions
of flex you should build-depend on:
flex | flex:native
Ben.
--
Ben Hutchings
The obvious mathematical breakthrough [to break modern encryption]
would be development of an easy way to factor large prime numbers.
- Bill Gates
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