[PATCH v2 00/12] Cross-compilation

[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]

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

-- 
2.1.4