[xen staging] build: work around bash issue

[patchbot@xxxxxxx]

commit 5132a0a37190b73c99dbbecf48dc4fb214feaf14
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Aug 7 13:12:00 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Aug 7 13:12:00 2020 +0200

    build: work around bash issue
    
    Older bash (observed with 3.2.57(2)) fails to honor "set -e" for certain
    built-in commands ("while" here), despite the command's status correctly
    being non-zero. The subsequent objcopy invocation now being separated by
    a semicolon results in no failure. Insert an explicit "exit" (replacing
    ; by && ought to be another possible workaround).
    
    Fixes: e321576f4047 ("xen/build: start using if_changed")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/Rules.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/Rules.mk b/xen/Rules.mk
index ebfd40caff..62e9fabe7a 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -193,7 +193,7 @@ define cmd_obj_init_o
             echo "Error: size of $<:$$name is 0x$$sz" >&2; \
             exit $$(expr $$idx + 1);; \
         esac; \
-    done; \
+    done || exit $$?; \
     $(OBJCOPY) $(foreach s,$(SPECIAL_DATA_SECTIONS),--rename-section 
.$(s)=.init.$(s)) $< $@
 endef
 
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