[xen master] build: don't export building_out_of_srctree

[patchbot@xxxxxxx]

commit e1b8adf9f39cf192e1e05f76d903b99fe87e5116
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri May 5 09:10:28 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 5 09:10:28 2023 +0200

    build: don't export building_out_of_srctree
    
    I don't view a variable of this name as suitable for exporting, the more
    that it carries entirely redundant information. The reasons for its
    introduction in Linux commit 051f278e9d81 ("kbuild: replace
    KBUILD_SRCTREE with boolean building_out_of_srctree") also don't apply
    to us. Ditch exporting of the variable, replacing uses suitably.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 xen/Makefile               | 2 +-
 xen/arch/x86/boot/Makefile | 2 +-
 xen/scripts/Makefile.host  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/Makefile b/xen/Makefile
index 5166403cff..745a3fadab 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -208,7 +208,7 @@ endif
 objtree := .
 VPATH := $(srctree)
 
-export building_out_of_srctree srctree objtree VPATH
+export srctree objtree VPATH
 
 export XEN_ROOT := $(abs_srctree)/..
 
diff --git a/xen/arch/x86/boot/Makefile b/xen/arch/x86/boot/Makefile
index d6bc8fc084..03d8ce3a9e 100644
--- a/xen/arch/x86/boot/Makefile
+++ b/xen/arch/x86/boot/Makefile
@@ -14,7 +14,7 @@ $(obj)/head.o: $(head-bin-objs:.o=.bin)
 CFLAGS_x86_32 := $(subst -m64,-m32 -march=i686,$(XEN_TREEWIDE_CFLAGS))
 $(call cc-options-add,CFLAGS_x86_32,CC,$(EMBEDDED_EXTRA_CFLAGS))
 CFLAGS_x86_32 += -Werror -fno-builtin -g0 -msoft-float
-ifdef building_out_of_srctree
+ifneq ($(abs_objtree),$(abs_srctree))
 CFLAGS_x86_32 += -I$(objtree)/include
 endif
 CFLAGS_x86_32 += -I$(srctree)/include
diff --git a/xen/scripts/Makefile.host b/xen/scripts/Makefile.host
index d6c358095e..ed24847575 100644
--- a/xen/scripts/Makefile.host
+++ b/xen/scripts/Makefile.host
@@ -88,7 +88,7 @@ _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
                  $(HOSTCXXFLAGS_$(target-stem).o)
 
 # $(objtree)/$(obj) for including generated headers from checkin source files
-ifdef building_out_of_srctree
+ifneq ($(abs_objtree),$(abs_srctree))
 _hostc_flags   += -I $(objtree)/$(obj)
 _hostcxx_flags += -I $(objtree)/$(obj)
 endif
--
generated by git-patchbot for /home/xen/git/xen.git#master