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Makefile: Forbid out-of-tree build from a source tree that has been built in

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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.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Peter Maydell 2012-10-19 14:54:23 +01:00 committed by Blue Swirl
parent 49cdaea18b
commit d1bd2423a9
1 changed files with 11 additions and 0 deletions
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Makefile
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@ -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@echo $@ is out-of-date, running configure