[PATCH] tools: hv: Fix cross-compilation

[Saurabh Sengar <ssengar@linux.microsoft.com>]

Use the native ARCH only incase it is not set, this will allow
the cross complilation where ARCH is explicitly set. Add few
info prints as well to know what arch and toolchain is getting
used to build it.

Additionally, simplify the check for ARCH so that fcopy daemon
is build only for x86_64.

Fixes: 82b0945ce2c2 ("tools: hv: Add new fcopy application based on uio driver")
Reported-by: Adrian Vladu <avladu@cloudbasesolutions.com>
Closes: https://lore.kernel.org/linux-hyperv/Z1Y9ZkAt9GPjQsGi@liuwe-devbox-debian-v2/
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 tools/hv/Makefile | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/hv/Makefile b/tools/hv/Makefile
index 34ffcec264ab..d29e6be6309b 100644
--- a/tools/hv/Makefile
+++ b/tools/hv/Makefile
@@ -2,7 +2,7 @@
 # Makefile for Hyper-V tools
 include ../scripts/Makefile.include
 
-ARCH := $(shell uname -m 2>/dev/null)
+ARCH ?= $(shell uname -m 2>/dev/null)
 sbindir ?= /usr/sbin
 libexecdir ?= /usr/libexec
 sharedstatedir ?= /var/lib
@@ -20,18 +20,26 @@ override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
 override CFLAGS += -Wno-address-of-packed-member
 
 ALL_TARGETS := hv_kvp_daemon hv_vss_daemon
-ifneq ($(ARCH), aarch64)
+ifeq ($(ARCH), x86_64)
 ALL_TARGETS += hv_fcopy_uio_daemon
 endif
 ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
 
 ALL_SCRIPTS := hv_get_dhcp_info.sh hv_get_dns_info.sh hv_set_ifconfig.sh
 
-all: $(ALL_PROGRAMS)
+all: info $(ALL_PROGRAMS)
 
 export srctree OUTPUT CC LD CFLAGS
 include $(srctree)/tools/build/Makefile.include
 
+info:
+	@echo "---------------------"
+	@echo "Building for:"
+	@echo "CC $(CC)"
+	@echo "LD $(LD)"
+	@echo "ARCH $(ARCH)"
+	@echo "---------------------"
+
 HV_KVP_DAEMON_IN := $(OUTPUT)hv_kvp_daemon-in.o
 $(HV_KVP_DAEMON_IN): FORCE
 	$(Q)$(MAKE) $(build)=hv_kvp_daemon
-- 
2.43.0