The current situation in Meson is that subprojects are always built for
the host machine. This means that while cross compiling, a tool that
must be run on the build machine must have all of its dependencies met
by the system (pkg-config, cmake, config-tool, etc); but dependencies
for the host machine can be built. With this patch subprojects may also
be built for the build machine.
Nothing should ever be installed from a subproject for the build
machine, while cross compiling. However, if we are not cross compiling
they are installed, since Meson can't really tell the difference between
a host and build dependency in that case.
Extracted from a patch by Dylan Baker <dylan@pnwbakers.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2631a5efc4