On Sun, Aug 23, 2015 at 5:57 PM, Michael Marineau <michael.marin...@coreos.com> wrote: > Using ccache with CCACHE_BASEDIR set to $(SRC_PATH) or a parent will > rewrite all absolute paths to relative paths. This interacts poorly with > QEMU's two-level build directory scheme. For example, lets say > BUILD_DIR=$(SRC_PATH)/build so build/blockdev.d will contain: > > blockdev.o: ../blockdev.c ../include/sysemu/block-backend.h \ > > Now the target build under build/x86_64-softmmu or similar will depend > on ../blockdev.o which in turn will get make to source ../blockdev.d to > check its dependencies. Since make always considers paths relative to > the current working directory rather than the makefile the path appeared > in the relative path to ../blockdev.c is useless. > > This change simply adds the top level build directory to vpath so paths > relative to the source directory, top build directory, and target build > directory all work just fine. > > Signed-off-by: Michael Marineau <michael.marin...@coreos.com> > --- > > This is a re-send with the proper Signed-off-by line. > > Makefile.target | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/Makefile.target b/Makefile.target > index 3e7aafd..dc32294 100644 > --- a/Makefile.target > +++ b/Makefile.target > @@ -7,7 +7,7 @@ include config-target.mak > include config-devices.mak > include $(SRC_PATH)/rules.mak > > -$(call set-vpath, $(SRC_PATH)) > +$(call set-vpath, $(SRC_PATH):$(BUILD_DIR)) > ifdef CONFIG_LINUX > QEMU_CFLAGS += -I../linux-headers > endif > -- > 2.4.6 >
ping http://patchwork.ozlabs.org/patch/510065/
