[Buildroot] [PATCH 2/4 v3] package/kvm-unit-tests: introduce _ARCH_SUPPORTS

[Yann E. MORIN <yann.morin.1998@free.fr>]

Arnout, All,

On 2017-07-10 21:56 +0200, Arnout Vandecappelle spake thusly:
> On 10-07-17 18:20, Yann E. MORIN wrote:
> > Thomas, All,
> > 
> > On 2017-07-10 18:09 +0200, Thomas Petazzoni spake thusly:
> >> On Sun,  9 Jul 2017 11:29:59 +0200, Yann E. MORIN wrote:
> >>
> >>> diff --git a/package/kvm-unit-tests/Config.in b/package/kvm-unit-tests/Config.in
> >>> index 7eab0c25d6..3db10fc820 100644
> >>> --- a/package/kvm-unit-tests/Config.in
> >>> +++ b/package/kvm-unit-tests/Config.in
> > [--SNIP--]
> >>> @@ -28,3 +32,7 @@ config BR2_PACKAGE_KVM_UNIT_TESTS
> >>>  	  features are submitted with accompanying unit tests.
> >>>  
> >>>  	  http://www.linux-kvm.org/page/KVM-unit-tests
> >>> +
> >>> +comment "kvm-unit-tests needs a toolchain w/ gcc >= 4.5"
> >>> +	depends on BR2_i386
> >>> +	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
> >> What about the x86_64 dependency on a host compiler >= 4.5 ?
> > In the manual, it is said that one should not add a comment about a
> > dependency on the host toolchain...
> 
>  I *think* Thomas didn't mean to say "host compiler". I think he meant:
> 
> Shouldn't this be:
> 	depends on BR2_i386 || BR2_x86_64
> 	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_5

No, because for x86_64 we are using the host compiler. See the .mk file:

    # For all architectures but x86-64, we use the target
    # compiler. However, for x86-64, we use the host compiler, as
    # kvm-unit-tests builds 32 bit code, which Buildroot toolchains for
    # x86-64 cannot do.
    ifneq ($(BR2_x86_64),y)
    KVM_UNIT_TESTS_CONF_OPTS += --cross-prefix="$(TARGET_CROSS)"
    endif

So for x86_64 there is no dependency to add on the target compiler at
all.

Regards,
Yann E. MORIN.

> 
>  Regards,
>  Arnout
> 
> [snip]
> 
> -- 
> Arnout Vandecappelle                          arnout at mind be
> Senior Embedded Software Architect            +32-16-286500
> Essensium/Mind                                http://www.mind.be
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