[Buildroot] Is there a way to alter BR2_CMAKE_VERSION_MIN?
Yann E. MORIN
yann.morin.1998 at free.fr
Tue Jun 23 19:04:13 UTC 2020
Asaf, All,
On 2020-06-23 21:36 +0300, Asaf Kahlon spake thusly:
> Currently, BR2_CMAKE_VERSION_MIN is set to 3.10.
> On my machine I have cmake=3.12 and on my BR2_EXTERNAL tree I have
> some private packages requiring cmake>=3.13.
> In the current state, Buildroot won't build host-cmake since the
> installed one is greater than 3.10, but still the compilation fails
> because those packages need a higher version from what I have on my
> machine.
>
> Is there a reason why BR2_CMAKE_VERSION_MIN isn't set with "?=" but
> with "="? Setting it with "?=" gives the user the option to change it
> in case there are private packages which need a higher version of
> CMake.
>
> Any other ideas on how to overcome this issue?
We already had the discussion a while ago on the IRC channel, and IIRC,
the conclusion was that we wanted to move to a per-package minimum
version, for example:
LIBFOO_CMAKE_REQUIRED_VERSION = 3.12
And the the cmake-package infra would automatically add host-cmake as a
dependency of libfoo if the host cmake is not suitable. Probably with
some code like:
$(2)_CMAKE = $$(shell support/dependencies/check-host-cmake.sh $$($(2)_CMAKE_REQUIRED_VERSION) $$(BR2_CMAKE_CANDIDATES))
ifeq ($$($(2)_CMAKE),)
$(2)_DEPENDENCIES += host-cmake
$(2)_CMAKE = $(HOST_DIR)/bin/cmake
endif
And then, remove:
$(2)_DEPENDENCIES += $(BR2_CMAKE_HOST_DEPENDENCY)
And change calls to $$(BR2_CMAKE) with calls to $$($(2)_CMAKE)
Then move the definition of BR2_CMAKE_CANDIDATES to pkg-cmake.mk
Expand all the packages that use cmake-package to define the version
they need.
And finally, kill support/dependencies/check-host-cmake.mk, tp keep only
support/dependencies/check-host-cmake.sh
Obviously, that will be a multi-patch, long effort...
Regards,
Yann E. MORIN.
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