On Fri, Oct 19, 2012 at 1:54 PM, Peter Maydell <peter.mayd...@linaro.org> wrote: > If we try to do an out-of-tree build but the source tree we're building from > has been used in the past for an in-tree build then things will go > confusingly wrong. Specifically, some parts of the build process will pull > in generated files from the old in-tree build (because SRC_PATH is on > the vpath). Diagnose this situation so we can produce a useful error > message and tell the user how to fix it (run distclean in the source tree). > > Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
OK, but maybe we should deprecate in-tree build and warn if it is detected. > --- > I got bitten by this again the other day so I figured it was worth > adding a molly-guard. The check is not perfect (it won't notice if > you did a distclean but didn't delete the *-softmmu &c directories, > for instance) but it should catch most cases of this user error. > > Makefile | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Makefile b/Makefile > index a9c22bf..5094a08 100644 > --- a/Makefile > +++ b/Makefile > @@ -8,6 +8,17 @@ ifneq ($(wildcard config-host.mak),) > # Put the all: rule here so that config-host.mak can contain dependencies. > all: > include config-host.mak > + > +# Check that we're not trying to do an out-of-tree build from > +# a tree that's been used for an in-tree build. > +ifneq ($(realpath $(SRC_PATH)),$(realpath .)) > +ifneq ($(wildcard $(SRC_PATH)/config-host.mak),) > +$(error This is an out of tree build but your source tree ($(SRC_PATH)) \ > +seems to have been used for an in-tree build. You can fix this by running \ > +"make distclean && rm -rf *-linux-user *-softmmu" in your source tree) > +endif > +endif > + > include $(SRC_PATH)/rules.mak > config-host.mak: $(SRC_PATH)/configure > @echo $@ is out-of-date, running configure > -- > 1.7.9.5 > >
