[xen staging] build: introduce cpp_flags macro

[patchbot@xxxxxxx]

commit 2ff44490fcbde6f43891a4835286dae6cd0c265e
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Tue Sep 7 09:14:12 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Sep 7 09:14:12 2021 +0200

    build: introduce cpp_flags macro
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/Makefile                    | 2 +-
 xen/Rules.mk                    | 7 +++++--
 xen/arch/x86/Makefile           | 2 +-
 xen/arch/x86/mm/Makefile        | 2 +-
 xen/arch/x86/mm/hap/Makefile    | 2 +-
 xen/arch/x86/mm/shadow/Makefile | 2 +-
 6 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/xen/Makefile b/xen/Makefile
index 94e8371826..4ceb02d374 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -410,7 +410,7 @@ include/xen/compile.h: include/xen/compile.h.in .banner
        @mv -f $@.new $@
 
 asm-offsets.s: arch/$(TARGET_ARCH)/$(TARGET_SUBARCH)/asm-offsets.c
-       $(CC) $(filter-out -Wa$(comma)% -flto,$(c_flags)) -S -g0 -o $@.new -MQ 
$@ $<
+       $(CC) $(call cpp_flags,$(c_flags)) -S -g0 -o $@.new -MQ $@ $<
        $(call move-if-changed,$@.new,$@)
 
 include/asm-$(TARGET_ARCH)/asm-offsets.h: asm-offsets.s
diff --git a/xen/Rules.mk b/xen/Rules.mk
index d65d6a4899..3503f13235 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -133,6 +133,9 @@ endif
 # Always build obj-bin files as binary even if they come from C source. 
 $(obj-bin-y): XEN_CFLAGS := $(filter-out -flto,$(XEN_CFLAGS))
 
+# To be use with e.g. $(a_flags) or $(c_flags) to produce CPP flags
+cpp_flags = $(filter-out -Wa$(comma)% -flto,$(1))
+
 # Calculation of flags, first the generic flags, then the arch specific flags,
 # and last the flags modified for a target or a directory.
 
@@ -222,13 +225,13 @@ $(filter %.init.o,$(obj-y) $(obj-bin-y) $(extra-y)): 
%.init.o: %.o FORCE
        $(call if_changed,obj_init_o)
 
 quiet_cmd_cpp_i_c = CPP     $@
-cmd_cpp_i_c = $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -MQ $@ -o $@ $<
+cmd_cpp_i_c = $(CPP) $(call cpp_flags,$(c_flags)) -MQ $@ -o $@ $<
 
 quiet_cmd_cc_s_c = CC      $@
 cmd_cc_s_c = $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -S $< -o $@
 
 quiet_cmd_cpp_s_S = CPP     $@
-cmd_cpp_s_S = $(CPP) $(filter-out -Wa$(comma)%,$(a_flags)) -MQ $@ -o $@ $<
+cmd_cpp_s_S = $(CPP) $(call cpp_flags,$(a_flags)) -MQ $@ -o $@ $<
 
 %.i: %.c FORCE
        $(call if_changed,cpp_i_c)
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index fe38cfd544..462472215c 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -292,7 +292,7 @@ $(BASEDIR)/include/asm-x86/asm-macros.h: asm-macros.i 
Makefile
 
 efi.lds: AFLAGS-y += -DEFI
 xen.lds efi.lds: xen.lds.S
-       $(CPP) -P $(filter-out -Wa$(comma)%,$(a_flags)) -MQ $@ -o $@ $<
+       $(CPP) -P $(call cpp_flags,$(a_flags)) -MQ $@ -o $@ $<
 
 boot/mkelf32: boot/mkelf32.c
        $(HOSTCC) $(HOSTCFLAGS) -o $@ $<
diff --git a/xen/arch/x86/mm/Makefile b/xen/arch/x86/mm/Makefile
index b31041644f..2818c066f7 100644
--- a/xen/arch/x86/mm/Makefile
+++ b/xen/arch/x86/mm/Makefile
@@ -15,7 +15,7 @@ guest_walk_%.o: guest_walk.c Makefile
        $(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
 
 guest_walk_%.i: guest_walk.c Makefile
-       $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* 
-c $< -o $@
+       $(CPP) $(call cpp_flags,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
 
 guest_walk_%.s: guest_walk.c Makefile
        $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -S 
$< -o $@
diff --git a/xen/arch/x86/mm/hap/Makefile b/xen/arch/x86/mm/hap/Makefile
index 22e7ad54bd..c6d296b517 100644
--- a/xen/arch/x86/mm/hap/Makefile
+++ b/xen/arch/x86/mm/hap/Makefile
@@ -9,7 +9,7 @@ guest_walk_%level.o: guest_walk.c Makefile
        $(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
 
 guest_walk_%level.i: guest_walk.c Makefile
-       $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* 
-c $< -o $@
+       $(CPP) $(call cpp_flags,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
 
 guest_walk_%level.s: guest_walk.c Makefile
        $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -S 
$< -o $@
diff --git a/xen/arch/x86/mm/shadow/Makefile b/xen/arch/x86/mm/shadow/Makefile
index 770213fe9d..fd64b4dda9 100644
--- a/xen/arch/x86/mm/shadow/Makefile
+++ b/xen/arch/x86/mm/shadow/Makefile
@@ -10,7 +10,7 @@ guest_%.o: multi.c Makefile
        $(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
 
 guest_%.i: multi.c Makefile
-       $(CPP) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* 
-c $< -o $@
+       $(CPP) $(call cpp_flags,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
 
 guest_%.s: multi.c Makefile
        $(CC) $(filter-out -Wa$(comma)%,$(c_flags)) -DGUEST_PAGING_LEVELS=$* -S 
$< -o $@
--
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