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

[Claudius Heine <ch@denx.de>]

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Hi,

On Wed, 2018-06-13 at 15:07 +0200, Alexander Smirnov wrote:
> 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.

Here is a crazy idea from me and Henning:
Have you tried just installing an amd64-arm cross toolchain into the
existing arm buildchroot, then switch to it from the 'native' toolchain
using a combination of PATH variable entries, symlinks and/or wrapper
scripts and let binfmt deal with calling the amd64 binaries of the
toolchain in the arm chroot environment?

This way the arm system would think that you are compiling nativly
while in fact you are using a cross compiler that is not emulated.

Would that work?

Cheers,
Claudius

> 
> 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.
> 
> 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
> 
> -- 
> 2.1.4
> 
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