[xen staging] x86/build: correctly record dependencies of asm-offsets.s

[patchbot@xxxxxxx]

commit 5e7aa904405fa2f268c3af213516bae271de3265
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Feb 2 11:36:50 2021 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 2 11:36:50 2021 +0100

    x86/build: correctly record dependencies of asm-offsets.s
    
    Going through an intermediate *.new file requires telling the compiler
    what the real target is, so that the inclusion of the resulting .*.d
    file will actually be useful.
    
    Fixes: 7d2d7a43d014 ("x86/build: limit rebuilding of asm-offsets.h")
    Reported-by: Julien Grall <julien@xxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 xen/arch/x86/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 7769bb40d7..3a9b7e7b2e 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -241,7 +241,7 @@ efi/buildid.o efi/relocs-dummy.o: 
$(BASEDIR)/arch/x86/efi/built_in.o
 efi/buildid.o efi/relocs-dummy.o: ;
 
 asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c 
$(BASEDIR)/include/asm-x86/asm-macros.h
-       $(CC) $(filter-out -Wa$(comma)% -flto,$(c_flags)) -S -g0 -o $@.new $<
+       $(CC) $(filter-out -Wa$(comma)% -flto,$(c_flags)) -S -g0 -o $@.new -MQ 
$@ $<
        $(call move-if-changed,$@.new,$@)
 
 asm-macros.i: CFLAGS-y += -D__ASSEMBLY__ -P
--
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