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

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

Thomas, All,

On 2017-07-10 23:47 +0200, Thomas Petazzoni spake thusly:
> On Mon, 10 Jul 2017 18:20:56 +0200, Yann E. MORIN wrote:
> > > 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...
> 
> The manual says one thing, reality says another:
> 
> package/collectd/Config.in:comment "write_prometheus needs a toolchain w/ C++, host gcc >= 4.5"
> package/cppcms/Config.in:comment "icu support needs a toolchain w/ gcc >= 4.8, host gcc >= 4.8"
> package/icu/Config.in:comment "icu needs a toolchain w/ C++, wchar, threads, gcc >= 4.8, host gcc >= 4.8"
> package/kodi/Config.in:comment "kodi needs python w/ .py modules, a uClibc or glibc toolchain w/ C++, locale, threads, wchar, dynamic library, gcc >= 4.8, host gcc >= 4.6"
> package/mfgtools/Config.in.host:comment "mfgtools needs host gcc >= 4.8"
> package/midori/Config.in:comment "midori needs libgtk3 and a glibc toolchain w/ C++, gcc >= 4.9, host gcc >= 4.8"
> package/php/Config.ext:comment "intl support needs a toolchain w/ C++, wchar, threads, gcc >= 4.8, host gcc >= 4.8"
> package/protobuf-c/Config.in:comment "protobuf-c needs a toolchain w/ C++, threads, host gcc >= 4.5"
> package/python-mwscrape2slob/Config.in:comment "python-mwscrape2slob needs a toolchain w/ C++, gcc >= 4.8, host gcc >= 4.8"
> package/python-pyicu/Config.in:comment "python-pyicu needs a toolchain w/ C++, gcc >= 4.8, host gcc >= 4.8"
> package/python-slob/Config.in:comment "python-slob needs a toolchain w/ C++, gcc >= 4.8, host gcc >= 4.8"
> package/qt5/qt5base/Config.in:comment "icu support needs a toolchain w/ gcc >= 4.8, host gcc >= 4.8"
> package/qt5/qt5webkit/Config.in:comment "qt5webkit needs a toolchain w/ dynamic library, gcc >= 4.8, host gcc >= 4.8"
> package/riemann-c-client/Config.in:comment "riemann-c-client needs a toolchain w/ C++, threads, host gcc >= 4.5"
> package/webkitgtk/Config.in:comment "webkitgtk needs libgtk3 and a glibc toolchain w/ C++, gcc >= 4.9, host gcc >= 4.8"
> 
> I'm not sure why we would not add Config.in comment for dependencies on
> the host toolchain. What's the reasoning for *not* adding such
> dependencies ?

Because there is not much a user can do about the toolchain on host host
machine?

As much as it is "possible" to change the version for the cross-gcc, the
native compiler is often not replaceable. This is most probably the case
on enterprise-grade servers, where users are not root (and are stuck
with a precambrian host compiler)...

I wrote the comment, checked the manual for the template, then removed
the comment. Oh well, here it is again, then:

    comment "kvm-unit-tests needs a host gcc >= 4.5"
        depends on BR2_x86_64
        depends on !BR2_HOST_GCC_AT_LEAST_4_5

Hehe! ;-)

Regards,
Yann E. MORIN.

> Best regards,
> 
> Thomas
> -- 
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com

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