[Buildroot] CMake package requires out of source build

[mattwood2000 at gmail.com]

Hi Peter,

On Mon, Feb 15, 2021 at 6:07 PM Peter Seiderer <ps.report at gmx.net> wrote:
>
> Hello Matt,
>
> On Mon, 15 Feb 2021 16:28:28 -0500, mattwood2000 at gmail.com wrote:
>
> > Hi,
> >
> > I've found myself in a bit of a dilemma with a piece of software I'm
> > trying to integrate into a custom cmake package.
> >
> > The software is the amazon avs-device-sdk:
> > https://github.com/alexa/avs-device-sdk
> >
> > For whatever reason, it does not support building within the source
> > tree.  Under normal circumstances one would set
> > <PKG>_SUPPORTS_IN_SOURCE_BUILD=NO, but in this case the sdk will not
> > support a build directory in the source SDK whatsoever, so that config
> > option is useless.
> >
> > The only way I can see to get around this short of Amazon fixing their
> > weird build requirement is to do a dirty hack like below.
> >
> > Does anyone have any other suggestions?
>
> You can try it the other way round, overwrite the extract step
> via <PKG>_EXTRACT_CMDS to extract into build/<package>-<version>/some_sub_dir
> and use <PKGC>_SUBDIR=some_sub_dir then (did not test the solution)....
>
> If it works it would have the advantage to not touch pkg-cmake.mk and keep
> all files in the package build directory...

Well, that sounded like a great solution but unfortunately the
buildroot still tries to build within the <PKG>_SUBDIR.  The main
issue is Amazon's rule to disallow in-source building, even within a
separate directory.  I worked around this by not including their
iterate function to detect an in-source build and using
SUPPORTS_IN_SOURCE_BUILD=NO.

Thanks for the suggestion though.


>
> Regards,
> Peter
>
> >
> > Thanks, Matt.
> >
> > --- a/package/pkg-cmake.mk
> > +++ b/package/pkg-cmake.mk
> > @@ -66,7 +66,8 @@ $(3)_SUPPORTS_IN_SOURCE_BUILD ?= YES
> >  ifeq ($$($(3)_SUPPORTS_IN_SOURCE_BUILD),YES)
> >  $(2)_BUILDDIR                  = $$($(2)_SRCDIR)
> >  else
> > -$(2)_BUILDDIR                  = $$($(2)_SRCDIR)/buildroot-build
> > +$(2)_BUILDDIR                  = $$($(2)_SRCDIR)/../$(1)_buildroot-build
> >  endif
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