[xen master] build: fix building flask headers before descending in flask/ss/

[patchbot@xxxxxxx]

commit d60324d8af9404014cfcc37bba09e9facfd02fcf
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Mon Jan 23 15:03:58 2023 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jan 23 15:03:58 2023 +0100

    build: fix building flask headers before descending in flask/ss/
    
    Unfortunatly, adding prerequisite to "$(obj)/ss/built_in.o" doesn't
    work because we have "$(obj)/%/built_in.o: $(obj)/% ;" in Rules.mk.
    So, make is allow to try to build objects in "xsm/flask/ss/" before
    generating the headers.
    
    Adding a prerequisite on "$(obj)/ss" instead will fix the issue as
    that's the target used to run make in this subdirectory.
    
    Unfortunatly, that target is also used when running `make clean`, so
    we want to ignore it in this case. $(MAKECMDGOALS) can't be used in
    this case as it is empty, but we can guess which operation is done by
    looking at the list of loaded makefiles.
    
    Fixes: 7a3bcd2babcc ("build: build everything from the root dir, use 
obj=$subdir")
    Reported-by: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/xsm/flask/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/xsm/flask/Makefile b/xen/xsm/flask/Makefile
index d25312f4fa..3fdcf7727e 100644
--- a/xen/xsm/flask/Makefile
+++ b/xen/xsm/flask/Makefile
@@ -16,7 +16,11 @@ FLASK_H_FILES := flask.h class_to_string.h 
initial_sid_to_string.h
 AV_H_FILES := av_perm_to_string.h av_permissions.h
 ALL_H_FILES := $(addprefix include/,$(FLASK_H_FILES) $(AV_H_FILES))
 
-$(addprefix $(obj)/,$(obj-y)) $(obj)/ss/built_in.o: $(addprefix 
$(obj)/,$(ALL_H_FILES))
+# Adding prerequisite to descending into ss/ folder only when not running
+# `make *clean`.
+ifeq ($(filter %/Makefile.clean,$(MAKEFILE_LIST)),)
+$(addprefix $(obj)/,$(obj-y)) $(obj)/ss: $(addprefix $(obj)/,$(ALL_H_FILES))
+endif
 extra-y += $(ALL_H_FILES)
 
 mkflask := $(srcdir)/policy/mkflask.sh
--
generated by git-patchbot for /home/xen/git/xen.git#master