Re: [PATCH] meta/classes/crossvars: move sdk toolchain selection from python block

[Srinuvasan Arjunan <srinuvasanasv@gmail.com>]

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On Monday, June 5, 2023 at 12:48:34 PM UTC+5:30 Jan Kiszka wrote:

On 05.06.23 09:07, Srinuvasan Arjunan wrote: 
> Yes tested working fine, here i do the append overrides in downstream 
> layer, like how the previous implementation before things move into the 
> python block. 
> 
> 
https://github.com/ilbers/isar/commit/43f402f4862c3779a492c50a26475ea1221a2b01 
> 
> Now in present implementation comapt-arch override was removed and this 
> selection of compat will be handled by  ISAR_ENABLE_COMPAT_ARCH 

So, d.setVar blocks :append and :remove, right?


         yes, correct. 

You don't want to set it 
downstream completely? 

But I dislike this long inline python, specifically as we already have 
the logic more readable. How about using an intermediate variable then 
which is defined in the anonymous python block while SDK_TOOLCHAIN gets 
that value by default outside the block?


  We could do this way. 



Or - to come back to your original issue - we make that use case of 
multilib officially an SDK toolchain option so that you just need to 
flip a switch, not fiddle with the internals of SDK_TOOLCHAIN.


  Yes , this also works , i will come back with more details. 



Jan 

> 
> Thanks, 
> Srinu 
> 
> On Monday, June 5, 2023 at 12:31:01 PM UTC+5:30 Jan Kiszka wrote: 
> 
> On 04.06.23 11:32, Srinuvasan Arjunan wrote: 
> > From: Srinuvasan A <srinuv...@siemens.com> 
> > 
> > In the present implementation we are not able to override the SDK 
> > toolchain from downstream layer, this is due to the SDK toolchain 
> > selection part in anonymous python function. 
> > 
> > Anonymous python functions always run at the end of parsing, 
> regardless of where they are defined 
> > even when we do override in our recipe, always wins the Anonymous 
> Python 
> > functions variable settings, hence we are not able to override our 
> > downstream toolchain. 
> > 
> > Move the SDK toolchian selection from python block, now we can 
> able to 
> > override from downstream layer. 
> > 
> > Signed-off-by: Srinuvasan A <srinuv...@siemens.com> 
> > --- 
> > meta/classes/crossvars.bbclass | 9 ++++----- 
> > 1 file changed, 4 insertions(+), 5 deletions(-) 
> > 
> > diff --git a/meta/classes/crossvars.bbclass 
> b/meta/classes/crossvars.bbclass 
> > index 201d460..120e6d1 100644 
> > --- a/meta/classes/crossvars.bbclass 
> > +++ b/meta/classes/crossvars.bbclass 
> > @@ -5,6 +5,10 @@ ISAR_CROSS_COMPILE ??= "0" 
> > 
> > inherit compat 
> > 
> > +SDK_TOOLCHAIN = "${@'build-essential' if 
> d.getVar('ISAR_CROSS_COMPILE') == '0' or d.getVar('HOST_ARCH') == 
> d.getVar('DISTRO_ARCH') or d.getVar('DISTRO_ARCH') == None else 
> 'crossbuild-essential-${DISTRO_ARCH}'}" 
> > + 
> > +SDK_TOOLCHAIN:append = "${@' 
> crossbuild-essential-${COMPAT_DISTRO_ARCH}' if 
> isar_can_build_compat(d) else ''}" 
> > + 
> 
> This is still no weak assignment which you will need for overrides. Did 
> you actually test this? And, again, can't we implement the weak 
> assignment in python below? 
> 
> Jan 
> 
> > python __anonymous() { 
> > import pwd 
> > d.setVar('SCHROOT_USER', pwd.getpwuid(os.geteuid()).pw_name) 
> > @@ -17,19 +21,14 @@ python __anonymous() { 
> > sbuild_dep = "sbuild-chroot-target:do_build" 
> > buildchroot_dir = d.getVar('BUILDCHROOT_TARGET_DIR', False) 
> > buildchroot_dep = "buildchroot-target:do_build" 
> > - sdk_toolchain = "build-essential" 
> > else: 
> > d.setVar('BUILD_HOST_ARCH', d.getVar('HOST_ARCH')) 
> > schroot_dir = d.getVar('SCHROOT_HOST_DIR', False) 
> > sbuild_dep = "sbuild-chroot-host:do_build" 
> > buildchroot_dir = d.getVar('BUILDCHROOT_HOST_DIR', False) 
> > buildchroot_dep = "buildchroot-host:do_build" 
> > - sdk_toolchain = "crossbuild-essential-" + distro_arch 
> > d.setVar('SCHROOT_DIR', schroot_dir) 
> > d.setVar('SCHROOT_DEP', sbuild_dep) 
> > d.setVar('BUILDCHROOT_DIR', buildchroot_dir) 
> > d.setVar('BUILDCHROOT_DEP', buildchroot_dep) 
> > - if isar_can_build_compat(d): 
> > - sdk_toolchain += " crossbuild-essential-" + 
> d.getVar('COMPAT_DISTRO_ARCH') 
> > - d.setVar('SDK_TOOLCHAIN', sdk_toolchain) 
> > } 
> 
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