Re: [RFC] [PATCH 0/9] Initial cross-compilation support

[Alexander Smirnov <asmirnov@ilbers.de>]

Hi Henning,

On 06/14/2018 02:20 PM, Henning Schild wrote:
> Am Wed, 13 Jun 2018 15:07:58 +0200
> schrieb Alexander Smirnov <asmirnov@ilbers.de>:
> 
>> Hi all,
>>
>> this series introduces basic cross-compilation support for Isar. The
>> implementation is based around new entity - buildchroot-cross, which
>> is quite similar to original buildchroot, but has host architecture.
>>
>> This series tested for the following configuration only:
>>
>>   $ bitbake multiconfig:qemui386
>>
>> In this build:
>>   - libhello is cross-compiled
>>   - example-hello is compiled traditionally (but it's successfully
>> linked with libhello)
>>
>> TODO list:
>>   - Depending on the target architecture, various host tools should be
>> installed. For example binutils package has the following names:
>>     * binutils
>>     * binutils-x86-64-linux-gnu
>>     * binutils-arm-linux-gnueabihf
>>   - Cross-dependency installation. This topic is still open for me
>> because 'mk-build-deps' tool doesn't work here correctly. For example
>> package depends on binutils, but instead of installation of
>> 'binutils-arm-linux-gnueabihf' it tries to install 'binutils:armhf'
>> and ruins the rootfs.
> 
> mk-build-deps supports the following switches "--arch foo --host-arch
> foo", maybe they help?
> 

Sorry that mess the thread, but the last message in this thread doesn't 
contain you comment :-)

So, I've tried to play with mk-build-deps, but results are really 
disappointed:

1. mk-build-deps support --host-arch and --build-arch starting from 
stretch only, in jessie these parameters are not presented.

2. I've tried to run mk-build-deps in stretch for libhello:

$ mk-build-deps --host-arch amd64 --build-arch i386 debian/control
...
dpkg -I libhello-cross-build-deps-depends_0.1_amd64.deb
  new debian package, version 2.0.
  size 2012 bytes: control archive=516 bytes.
      367 bytes,    11 lines      control
      283 bytes,     3 lines      md5sums
  Package: libhello-cross-build-deps-depends
  Version: 0.1
  Architecture: amd64
  Maintainer: root <root@>
  Installed-Size: 9
  Depends: build-essential:i386, crossbuild-essential-amd64:i386, 
debhelper (>= 9), docbook-to-man
  Section: devel
  Priority: optional
  Multi-Arch: foreign
  Description: build-dependencies for libhello
   Dependency package to build the 'libhello' package

BUT: package 'crossbuild-essential-amd64:i386' does not exists. At least 
I wasn't able to find it via apt (I've also added i386 to source list).

Another issue during attempts to install generated deps:

$ apt-get install build-essential:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
  build-essential:i386 : Depends: libc6-dev:i386 but it is not going to 
be installed or
                                  libc-dev:i386
                         Depends: gcc:i386 (>= 4:6.3) but it is not 
going to be installed
                         Depends: g++:i386 (>= 4:6.3) but it is not 
going to be installed
                         Depends: make:i386
  libhello-cross-build-deps : Depends: crossbuild-essential-amd64:i386 
but it is not installable
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages 
(or specify a solution).

It tries to pull target compiler, what is also incorrect behavior. The 
cross binutils should be installed instead.

So, will continue this investigation :-(

Alex

> Henning
> 
>> So, as usually, comments and suggestions are welcome :-)
>>
>> With best redgards,
>> Alex
>>
>> Alexander Smirnov (9):
>>    isar-bootstrap: Add routin to determine host arch
>>    isar-bootstrap: Move common part to include
>>    isar-bootstrap: Add host architecture support
>>    isar-bootstrap-helper: Add parameter to set arch
>>    buildchroot-cross: Initial implementation
>>    classes/dpkg*: Relocate dependency from buildchroot
>>    classes/dpkg*: Drop hardcoded buildchroot blobs
>>    classes/dpkg-cross: Initial implementation
>>    [FOR TESTING] libhello: Switch to cross compilation
>>
>>   meta-isar/recipes-app/libhello/libhello.bb         |   2 +-
>>   meta/classes/dpkg-base.bbclass                     |  17 +-
>>   meta/classes/dpkg-cross.bbclass                    |  15 ++
>>   meta/classes/dpkg-raw.bbclass                      |   7 +-
>>   meta/classes/dpkg.bbclass                          |   7 +-
>>   meta/classes/image.bbclass                         |   2 +-
>>   meta/classes/isar-bootstrap-helper.bbclass         |  13 +-
>>   meta/conf/isar-bitbake.conf                        |   1 +
>>   .../isar-bootstrap/isar-bootstrap-host.bb          |  44 ++++
>>   .../isar-bootstrap/isar-bootstrap-target.bb        |  44 ++++
>>   meta/recipes-core/isar-bootstrap/isar-bootstrap.bb | 259
>> --------------------- .../recipes-core/isar-bootstrap/isar-bootstrap.inc
>> | 223
>> ++++++++++++++++++ .../buildchroot/buildchroot-cross.bb
>> |  53 +++++ meta/recipes-devtools/buildchroot/buildchroot.bb   |   2
>> +- .../buildchroot/files/build-cross.sh               |  29 +++ 15
>> files changed, 443 insertions(+), 275 deletions(-) create mode 100644
>> meta/classes/dpkg-cross.bbclass create mode 100644
>> meta/recipes-core/isar-bootstrap/isar-bootstrap-host.bb create mode
>> 100644 meta/recipes-core/isar-bootstrap/isar-bootstrap-target.bb
>> delete mode 100644 meta/recipes-core/isar-bootstrap/isar-bootstrap.bb
>> create mode 100644
>> meta/recipes-core/isar-bootstrap/isar-bootstrap.inc create mode
>> 100644 meta/recipes-devtools/buildchroot/buildchroot-cross.bb create
>> mode 100644 meta/recipes-devtools/buildchroot/files/build-cross.sh
>>
>