Hi Bruce,

> On 08/22/2018 09:40 AM, Lukasz Majewski wrote:
> > Without this patch it happens that do_populate_recipe_sysroot is
> > called just before do_compile (on multi core build machines).
> > This is way too late as the .config generated in
> > do_kernel_configme() is already broken.
> > 
> > The problem is that do_kernel_configme() calls native's
> > merge_config.sh script which may call bison and arm-linux-*-gcc to
> > compile kconfig infrastructure to create base .config
> > (scripts/kconfig/conf  --allnoconfig Kconfig.)
> > 
> > It turns out that we only got above binaries after
> > do_prepare_recipe_sysroot() is called.
> > If those binaries are not available, the merge_config.sh do not
> > generate base .config and without any error produces
> > malfunctioned .config. The build process continues and as a result
> > broken kernel is compiled.
> > 
> > To reproduce:
> > 
> > bitbake -c cleansstate virtual/kernel
> > bitbake -c kernel_metadata -v virtual/kernel
> > bitbake -c do_kernel_configme -v virtual/kernel
> > (one shall see broken .config in ${B}/.config)
> > bitbake -c do_populate_sysroot -v virtual/kernel
> > bitbake -c do_compile -v virtual/kernel
> > 
> > (Poky) SHA1: bb91b2ae3ee5cf108aa2f9b78abb14d5aa00831d
> > 
> > Signed-off-by: Lukasz Majewski <lukma@denx.de>
> > ---
> >   meta/classes/kernel-yocto.bbclass | 1 +
> >   1 file changed, 1 insertion(+)
> > 
> > diff --git a/meta/classes/kernel-yocto.bbclass
> > b/meta/classes/kernel-yocto.bbclass index 4ac3a39e47..19a3f2bc46
> > 100644 --- a/meta/classes/kernel-yocto.bbclass
> > +++ b/meta/classes/kernel-yocto.bbclass
> > @@ -276,6 +276,7 @@ do_kernel_metadata[depends] =
> > "kern-tools-native:do_populate_sysroot"
> > do_validate_branches[depends] =
> > "kern-tools-native:do_populate_sysroot" do_kernel_configme[dirs] +=
> > "${S} ${B}" +do_kernel_configme[depends] +=
> > "virtual/kernel:do_prepare_recipe_sysroot"  
> 
> On a closer look .. what branch is this from ? We already have a
> change that triggered breakage on 4.17+ that should fix this.
> 
> i.e. commit ff1bdd75d50f0ebac3d599e461685ace29559a82 in oe-core, adds:
> 
> ----------
> 
>   do_kernel_metadata[depends] =
> "kern-tools-native:do_populate_sysroot" do_validate_branches[depends]
> = "kern-tools-native:do_populate_sysroot"
> 
> +do_kernel_configme[depends] += 
> "virtual/${TARGET_PREFIX}binutils:do_populate_sysroot"
> +do_kernel_configme[depends] += 
> "virtual/${TARGET_PREFIX}gcc:do_populate_sysroot"
> +do_kernel_configme[depends] += "bc-native:do_populate_sysroot 
> bison-native:do_populate_sysroot"
>   do_kernel_configme[dirs] += "${S} ${B}"
>   do_kernel_configme() {
> 
> ----------
> 
> Which I don't see in the context of your patch.
> 

I do use poky as in the commit message.

Regarding the kernel - I do have my own recipe;
inherit kernel 

require
recipes-kernel/linux/linux-yocto.inc                                                                                                                                                                                                   


And then I do have:
COMPATIBLE_MACHINE_display5 = "display5" 

KBUILD_DEFCONFIG_pn-linux-yocto-custom_display5 =
"imx6q_display5_defconfig"                                                                                                                                                                   

As the board is in mainline I just point to Linus tree.

> Bruce
> 
> >   do_kernel_configme() {
> >   	set +e
> >   
> >   
> 




Best regards,

Lukasz Majewski

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