[yocto] native recipe and sysroot-destdir troubles

[Richard Purdie]

On Fri, 2012-04-13 at 17:17 -0400, Philip Tricca wrote:
> Worked out a solution to this issue.  For the sake of brevity it can be
> found here:
> 
> http://twobit.us/blog/2012/04/openembedded-yocto-native-hello-world/

So just to follow up here too for the list archives:

This “craziness” does have a rational explanation. “native” targets are
meant to run on the system they’re built on and run in the location
they’re installed to. This means they install to a destination of “/”
and PREFIX is inside the native sysroot directory.

We install them to a DESTDIR to allow us to manipulate them before they
then get moved to a final DESTDIR of “/”.

Most Makefiles handle this correctly by doing:

DESTDIR ?= “”
prefix ?= “/usrr”
bindir ?= “$(prefix)/bin”

and then, importantly, install in the form:

install -d $(DESTDIR)$(bindir)

so both prefix and DESTDIR are used. Whilst this is a convention, its a
widely adopted and followed one. As you’ve found, you can call into a
custom makefile and set the variables manually if the makefile doesn’t
follow the convention.

Cheers,

Richard