Makefile: fix use of PWD in target "all"
The "all" target creates the build-head file in the wrong location when
using "make -C" or "sudo make". The reason is that the PWD environment
variable gets the value of the current directory when calling "make -C"
(before the -C changes directories), or is unset in the case of "sudo
make". Note that the PWD is not changed by the previous "cd $(SRCDIR)".
/a/b/c $ make -C ../kvm-unit-tests
=====> creates /a/b/c/build-head
/a/b/kvm-unit-tests $ sudo make
=====> creates /build-head
(note the root)
The consequence of this is that the standalone script can't find the
build-head file:
/a/b/c $ make -C kvm-unit-tests standalone
cat: build-head: No such file or directory
...
/a/b/kvm-unit-tests $ sudo make standalone
cat: build-head: No such file or directory
...
The fix is to not use PWD. "cd $SRCDIR && git rev-parse" is run in a
subshell in order to not break out-of-tree builds, which expect
build-head in the current directory (/a/b/c/build-head below).
Tested:
out-of-tree build:
/a/b/c $ ../kvm-unit-tests/configure && make standalone
sudo make:
/a/b/kvm-unit-tests $ ./configure && sudo make standalone
make -C:
/a/b/c $ (cd ../kvm-unit-tests && ./configure) && \
make -C ../kvm-unit-tests standalone
Signed-off-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Message-Id: <20201211194331.3830000-1-ricarkol@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/Makefile b/Makefile
index 0e21a49..e0828fe 100644
--- a/Makefile
+++ b/Makefile
@@ -101,7 +101,7 @@
-include */.*.d */*/.*.d
-all: directories $(shell cd $(SRCDIR) && git rev-parse --verify --short=8 HEAD >$(PWD)/build-head 2>/dev/null)
+all: directories $(shell (cd $(SRCDIR) && git rev-parse --verify --short=8 HEAD) >build-head 2>/dev/null)
standalone: all
@scripts/mkstandalone.sh
