[Buildroot] [git commit] package/dhcp: fix cross build

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=e1dc10b7b8e163ccceca6d0faff27b33517476fd
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fixes build error

Building dns library in /home/bernd/buildroot/br4/output/build/dhcp-4.4.3-
P1/bind/bind-9.11.36/lib/dns
./gen: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found
(required by ./gen)
make[4]: *** [Makefile:601: include/dns/enumtype.h] Error 1
make[3]: *** [Makefile:595: include] Error 2

with this defconfig

BR2_x86_64=y
BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
BR2_PACKAGE_DHCP=y

Please note that this build error only occurs when the target and the
host system have the same arch. For example this defconfig builds fine:

BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
BR2_PACKAGE_DHCP=y

on a Debian 12 x86_64 host using glibc-2.36:

$ /lib/ld-linux.so.2  --version
ld.so (Debian GLIBC 2.36-9+deb12u1) stable release version 2.36.

The error occurs since buildroot commit 34f8d874ee which bumped glibc
from 2.37 to 2.38.

This patch is inspired by the Yocto Project:
https://patchwork.yoctoproject.org/project/oe/patch/20230715212159.3265080-1-raj.khem@gmail.com/

Signed-off-by: Bernd Kuhls <bernd at kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
 package/dhcp/dhcp.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/package/dhcp/dhcp.mk b/package/dhcp/dhcp.mk
index 9d0bcf001f..b3b7fe3203 100644
--- a/package/dhcp/dhcp.mk
+++ b/package/dhcp/dhcp.mk
@@ -33,6 +33,9 @@ DHCP_CONF_ENV = \
 	CFLAGS='$(TARGET_CFLAGS) -DISC_CHECK_NONE=1'
 
 DHCP_BIND_EXTRA_CONFIG = \
+	--build=$(GNU_HOST_NAME) \
+	--host=$(GNU_TARGET_NAME) \
+	--target=$(GNU_TARGET_NAME) \
 	BUILD_CC='$(HOSTCC)' \
 	BUILD_CFLAGS='$(HOST_CFLAGS)' \
 	BUILD_CPPFLAGS='$(HOST_CPPFLAGS)' \