[xen staging] build: fix exporting for make 3.82

[patchbot@xxxxxxx]

commit 95b0d7bbddfbd797f37f7a09f0586c4bbd22291b
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jun 15 10:23:16 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jun 15 10:23:16 2022 +0200

    build: fix exporting for make 3.82
    
    GNU make 3.82 apparently has a quirk where exporting an undefined
    variable prevents its value from subsequently being updated. This
    situation can arise due to our adding of -rR to MAKEFLAGS, which takes
    effect also on make simply re-invoking itself. Once these flags are in
    effect, CC (in particular) is empty (undefined), and would be defined
    only via Config.mk including StdGNU.mk or alike. With the quirk, CC
    remains empty, yet with an empty CC the compiler minimum version check
    fails, breaking the build.
    
    Move the exporting of the various tool stack component variables past
    where they gain their (final) values.
    
    See also be63d9d47f57 ("build: tweak variable exporting for make 3.82").
    
    Fixes: 15a0578ca4b0 ("build: shuffle main Makefile")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 xen/Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/Makefile b/xen/Makefile
index 82f5310b12..ede4f15b18 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -44,8 +44,6 @@ export ARCH SRCARCH
 # Allow someone to change their config file
 export KCONFIG_CONFIG ?= .config
 
-export CC CXX LD NM OBJCOPY OBJDUMP ADDR2LINE
-
 export TARGET := xen
 
 .PHONY: dist
@@ -244,6 +242,7 @@ export TARGET_ARCH     := $(shell echo $(XEN_TARGET_ARCH) | 
\
                                 -e s'/riscv.*/riscv/g')
 
 export CONFIG_SHELL := $(SHELL)
+export CC CXX LD NM OBJCOPY OBJDUMP ADDR2LINE
 export YACC = $(if $(BISON),$(BISON),bison)
 export LEX = $(if $(FLEX),$(FLEX),flex)
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging