[PATCH v3 0/3] Improve optional lib support

[Bruce Richardson <bruce.richardson@intel.com>]

This patchset builds on the previous v1 and v2, and the discussion
which followed about what libraries should be optional. While still
a long way to go from the position suggested in the v2 discussion,
this set moves us a bit further along the road.

The first patch is a direct v3 from previous versions, changing the
tracking from a list of optional libs to a list of mandatory ones.
The second patch then knocks off another 5 libs off the mandatory
list - all are libs which should have few dependencies in other
components, but which some common sample apps like l3fwd depend upon.
It should be possible to make other libs optional in future, but to
do so likely requires code-changes to #ifdef out support in places.

To that end, patch 3 is an RFC to add support for "optional libs" to
the build system. For now, nothing uses this, but it may be useful if
someone does want to take on the task of removing a hard dependency
from one component on another and making it optional.

Bruce Richardson (3):
  build: track mandatory rather than optional libs
  build: remove 5 libs from mandatory list
  build: RFC - add support for optional dependencies

 app/test/meson.build |  4 +--
 drivers/meson.build  |  7 +++++
 lib/meson.build      | 72 ++++++++++++++++----------------------------
 3 files changed, 35 insertions(+), 48 deletions(-)

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2.40.1