Re: [PATCH v2 00/12] Cross-compilation

[Henning Schild <henning.schild@siemens.com>]

Am Thu, 28 Jun 2018 10:27:58 +0200
schrieb Alexander Smirnov <asmirnov@ilbers.de>:

> Hi all,
> 
> [NOTE]
>   Cover letter is too long, so I don't expect that you read it all.
> So I'd like to start with this message to avoid possible
> question. :-) This series has intersection with SDK one, so it should
> be rebased after SDK is applied to next. Thanks!
> [/NOTE]

[NOTE]
Stopped review here, waiting for v3 since SDK has been applied.
[/NOTE]

Henning

> 
> here is the second version of cross-compilation support.
> This version adds support for cross-compiling stretch-armhf target.
> 
> What's new here:
>  - Build dependencies are resolved automatically, so isar-image-base
> could be built using cross-compilation only (libhello, example-hello,
> example-raw)
>  - Linux kernel could be also cross-compiled now for arm
> 
> Test scenarios:
> 1. Build isar-image-base:
>  - Set variable in local.conf ISAR_CROSS_COMPILE to "1"
>  - Edit recipes: libhello and example-hello and replace
>    "inherit dpkg" by "inherit dpkg-cross"
>  - Build using "bitbake multiconfig:qemuarm-stretch:isar-image-base"
>  - With cross-compilation the image is generated twice faster
> 
> 2. Build arm kernel:
>  - Set variable in local.conf ISAR_CROSS_COMPILE to "1"
>  - There is no default arm config, so I derived the one from linux-cip
>    tree: "zx_config" and add it to recipe
>  - Build it "bitbake multiconfig:qemuarm-stretch:linux-cip"
>  - Aftewards I have the following packages:
>    * linux-image-4.4.112-cip18_4.4.112-cip18-1_armhf.deb
>    * linux-image-4.4.112-cip18-dbg_4.4.112-cip18-1_armhf.deb
>    * linux-headers-4.4.112-cip18_4.4.112-cip18-1_armhf.deb
>  - The compilation tooks me about 2-3 minutes. Much faster than in
> QEMU
> 
> Issue:
> 1. No support for jessie. The main issue here, that jessie doesn't
> have armhf compiler in default apt. Official wiki asks you to use
> embian apt to get it
> 2. mk-build-deps has two params: --host-arch, --cross-arch. But they
> seem to work incorrectly. If set both of them in deps list I got
> unexisting packages. Now I use --host-arch only and it works good. I
> want to check this in buster and then probably ask Debian community
> reagrding this 3. i386 architecture for now is not considered as a
> target for cross compilation
> 4. Currently libhello and example-hello applications have hardcoded
> native compilation (inherit dpkg). This should be reworked to depend
> on ISAR_CROSS_COMPILE variable
> 
> Huh, no more ideas, let's start with this.
> 
> Alex
> 
> Alexander Smirnov (12):
>   isar-bootstrap: Add routine 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
>   build.sh: Add target parameter
>   classes/dpkg-cross: Initial implementation
>   dpkg: Resolve dep from buildchroot
>   linux: Add cross-compilation support
>   local.conf: Add cross-compilation option
> 
>  meta-isar/conf/local.conf.sample                   |   5 +
>  meta/classes/dpkg-base.bbclass                     |  33 ++-
>  meta/classes/dpkg-cross.bbclass                    |  12 +
>  meta/classes/dpkg-raw.bbclass                      |   2 +-
>  meta/classes/dpkg.bbclass                          |   4 +-
>  meta/classes/image.bbclass                         |   2 +-
>  meta/classes/isar-bootstrap-helper.bbclass         |  19 +-
>  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
> |  57 +++++ meta/recipes-devtools/buildchroot/buildchroot.bb   |   2
> +- meta/recipes-devtools/buildchroot/files/build.sh   |  17 +-
> meta/recipes-kernel/linux/files/build-kernel.sh    |  16 ++
> meta/recipes-kernel/linux/linux-custom.inc         |   6 +- 17 files
> changed, 468 insertions(+), 278 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
>