[Buildroot] [PATCH 1/1] package/frr: add libxcrypt optional dependency

[Fabrice Fontaine]

Fix the following build failure raised since bump of glibc to version
2.39 in commit b5680f53d60acf8ff6010082f873438a39bd5d97:

/home/autobuild/autobuild/instance-1/output-1/per-package/frr/host/bin/../lib/gcc/i686-buildroot-linux-gnu/12.3.0/../../../../i686-buildroot-linux-gnu/bin/ld: lib/.libs/libfrr.so: undefined reference to `crypt'

Fixes: b5680f53d60acf8ff6010082f873438a39bd5d97
 - http://autobuild.buildroot.org/results/668da3829cacbe883e6cf97ce6191a8180441db6

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
---
 package/frr/Config.in | 1 +
 package/frr/frr.mk    | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/frr/Config.in b/package/frr/Config.in
index ef105202f4..e2ad5d5aa6 100644
--- a/package/frr/Config.in
+++ b/package/frr/Config.in
@@ -9,6 +9,7 @@ config BR2_PACKAGE_FRR
 	depends on BR2_HOST_GCC_AT_LEAST_7 # protobuf-c
 	select BR2_PACKAGE_BASH
 	select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # bash
+	select BR2_PACKAGE_LIBXCRYPT if BR2_TOOLCHAIN_USES_GLIBC
 	select BR2_PACKAGE_LIBYANG
 	select BR2_PACKAGE_PROTOBUF_C
 	select BR2_PACKAGE_READLINE
diff --git a/package/frr/frr.mk b/package/frr/frr.mk
index 29a9e7b3e8..d20dc07bb7 100644
--- a/package/frr/frr.mk
+++ b/package/frr/frr.mk
@@ -13,7 +13,8 @@ FRR_CPE_ID_PRODUCT = free_range_routing
 FRR_AUTORECONF = YES
 
 FRR_DEPENDENCIES = host-frr readline json-c libyang protobuf-c \
-	$(if $(BR2_PACKAGE_C_ARES),c-ares)
+	$(if $(BR2_PACKAGE_C_ARES),c-ares) \
+	$(if $(BR2_PACKAGE_LIBXCRYPT),libxcrypt)
 
 HOST_FRR_DEPENDENCIES = host-flex host-bison host-elfutils host-python3
 
-- 
2.43.0