[XEN PATCH v8 21/47] build: generate x86's asm-macros.h with filechk

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

When we will build out-of-tree, make is going to try to generate
"asm-macros.h" before the directories "arch/x86/include/asm" exist,
thus we would need to call `mkdir` explicitly. We will use "filechk"
for that as it does everything that the current recipe does and does
call `mkdir`.

Also, they are no more "*.new" files generated in this directory.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/Makefile | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 456b7eed7536..873b32cc6945 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -230,18 +230,21 @@ include: $(BASEDIR)/arch/x86/include/asm/asm-macros.h
 $(obj)/asm-macros.i: CFLAGS-y += -D__ASSEMBLY__ -P
 
 $(BASEDIR)/arch/x86/include/asm/asm-macros.h: $(obj)/asm-macros.i 
$(src)/Makefile
-       echo '#if 0' >$@.new
-       echo '.if 0' >>$@.new
-       echo '#endif' >>$@.new
-       echo '#ifndef __ASM_MACROS_H__' >>$@.new
-       echo '#define __ASM_MACROS_H__' >>$@.new
-       echo 'asm ( ".include \"$@\"" );' >>$@.new
-       echo '#endif /* __ASM_MACROS_H__ */' >>$@.new
-       echo '#if 0' >>$@.new
-       echo '.endif' >>$@.new
-       cat $< >>$@.new
-       echo '#endif' >>$@.new
-       $(call move-if-changed,$@.new,$@)
+       $(call filechk,asm-macros.h)
+
+define filechk_asm-macros.h
+    echo '#if 0'; \
+    echo '.if 0'; \
+    echo '#endif'; \
+    echo '#ifndef __ASM_MACROS_H__'; \
+    echo '#define __ASM_MACROS_H__'; \
+    echo 'asm ( ".include \"$@\"" );'; \
+    echo '#endif /* __ASM_MACROS_H__ */'; \
+    echo '#if 0'; \
+    echo '.endif'; \
+    cat $<; \
+    echo '#endif'
+endef
 
 $(obj)/efi.lds: AFLAGS-y += -DEFI
 $(obj)/xen.lds $(obj)/efi.lds: $(src)/xen.lds.S FORCE
@@ -255,7 +258,7 @@ $(obj)/efi/mkreloc: $(src)/efi/mkreloc.c
 
 .PHONY: clean
 clean::
-       rm -f *.lds *.new boot/*.o boot/*~ boot/core boot/mkelf32
+       rm -f *.lds boot/*.o boot/*~ boot/core boot/mkelf32
        rm -f asm-macros.i $(BASEDIR)/arch/x86/include/asm/asm-macros.*
        rm -f $(BASEDIR)/.xen-syms.[0-9]* boot/.*.d $(BASEDIR)/.xen.elf32
        rm -f $(BASEDIR)/.xen.efi.[0-9]* efi/*.efi efi/mkreloc
-- 
Anthony PERARD