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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