tree f3972eebe98c4c9f9df3944e9def966800647f63
parent fbd0110dbdb531b57c4758e04f08fc128feb7201
author David Brown <david.brown@linaro.org> 1604511838 -0700
committer David Brown <david.brown@linaro.org> 1604511838 -0700

cmake: Avoid using target_properties for old cmake

CMake versions less than 3.0 do not support the `target_sources`
command.  In order to be able to support v2.8.12.2 of cmake, add the
extra targets directly to the target command.

This is a backport from the development branch, except that the uses in
this branch are simpler, and modifying the SOURCES property directly is
not needed.

Fixes #3801

Signed-off-by: David Brown <david.brown@linaro.org>