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[Xen-devel] [PATCH v3 1/5] build: filter out command line assembler arguments

If the assembler is not used. This happens when using cc -E or cc -S
for example. GCC will just ignore the -Wa,... when the assembler is
not called, but clang will complain loudly and fail.

This is a preparatory change in order to pass assembler arguments when
using clang.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
 xen/arch/x86/Makefile | 6 +++---
 xen/include/Makefile  | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index d903b7abb9..021a4ba27e 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -215,15 +215,15 @@ efi/boot.init.o efi/runtime.o efi/compat.o efi/buildid.o: 
 efi/boot.init.o efi/runtime.o efi/compat.o efi/buildid.o: ;
 asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c
-       $(CC) $(filter-out -flto,$(CFLAGS)) -S -o $@ $<
+       $(CC) $(filter-out -Wa% -flto,$(CFLAGS)) -S -o $@ $<
 xen.lds: xen.lds.S
-       $(CC) -P -E -Ui386 $(AFLAGS) -o $@ $<
+       $(CC) -P -E -Ui386 $(filter-out -Wa%,$(AFLAGS)) -o $@ $<
        sed -e 's/xen\.lds\.o:/xen\.lds:/g' <.xen.lds.d >.xen.lds.d.new
        mv -f .xen.lds.d.new .xen.lds.d
 efi.lds: xen.lds.S
-       $(CC) -P -E -Ui386 -DEFI $(AFLAGS) -o $@ $<
+       $(CC) -P -E -Ui386 -DEFI $(filter-out -Wa%,$(AFLAGS)) -o $@ $<
        sed -e 's/efi\.lds\.o:/efi\.lds:/g' <.$(@F).d >.$(@F).d.new
        mv -f .$(@F).d.new .$(@F).d
diff --git a/xen/include/Makefile b/xen/include/Makefile
index 19066a33a0..094726aab5 100644
--- a/xen/include/Makefile
+++ b/xen/include/Makefile
@@ -65,7 +65,7 @@ compat/%.h: compat/%.i Makefile 
        mv -f $@.new $@
 compat/%.i: compat/%.c Makefile
-       $(CPP) $(filter-out -M% %.d -include %/include/xen/config.h,$(CFLAGS)) 
$(cppflags-y) -o $@ $<
+       $(CPP) $(filter-out -Wa% -M% %.d -include 
%/include/xen/config.h,$(CFLAGS)) $(cppflags-y) -o $@ $<
 compat/%.c: public/%.h xlat.lst Makefile 
        mkdir -p $(@D)

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