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build: establish an invariant machine type

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Add the machine definition 'default' which is special compared
to 'native' (most optimized for current system) or any explicit
type (external entity has to decide on the type).

It defaults to the per arch agreed common minimal baseline
needed for DPDK to reasonable work.

That might not be the most optimized, but the most portable
version while still being able to support the CPU features
required for DPDK.

Going forward this can be bumped up by the DPDK project, but it
can never be an invariant like 'native'.

Distributions and other needing portable code are expected to
define the machine as 'default'.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Acked-by: Luca Boccassi <bluca@debian.org>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Christian Ehrhardt 2018-11-14 20:40:12 +01:00 committed by Thomas Monjalon
parent aba3289e87
commit c04e679e86
1 changed files with 21 additions and 0 deletions
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21
config/meson.build
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@ -7,6 +7,27 @@ if meson.is_cross_build()
else
machine = get_option('machine')
endif
# machine type 'default' is special, it defaults to the per arch agreed common
# minimal baseline needed for DPDK.
# That might not be the most optimized, but the most portable version while
# still being able to support the CPU features required for DPDK.
# This can be bumped up by the DPDK project, but it can never be an
# invariant like 'native'
if machine == 'default'
if host_machine.cpu_family().startswith('x86')
# matches the old pre-meson build systems default
machine = 'corei7'
elif host_machine.cpu_family().startswith('arm')
machine = 'armv7-a'
elif host_machine.cpu_family().startswith('aarch')
# arm64 manages defaults in config/arm/meson.build
machine = 'default'
elif host_machine.cpu_family().startswith('ppc')
machine = 'power8'
endif
endif
dpdk_conf.set('RTE_MACHINE', machine)
machine_args = []