From b4eba9a0259abb4a9c2337c77758072130e1b6ff Mon Sep 17 00:00:00 2001
From: "Robin H. Johnson" <robbat2@gentoo.org>
Date: Thu, 2 Jan 2025 17:26:51 -0800
Subject: [PATCH] feat: allow libc strlcpy

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Fixes: https://github.com/radvd-project/radvd/issues/248
---
 configure.ac | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index a0b2804..d6f7287 100644
--- a/configure.ac
+++ b/configure.ac
@@ -93,8 +93,23 @@ AC_MSG_RESULT(no)
 
 dnl clock_gettime is in librt for glibc <2.17
 AC_SEARCH_LIBS(clock_gettime, rt)
-dnl strlcpy is in libbsd
-AC_SEARCH_LIBS(strlcpy, bsd)
+
+AC_CHECK_FUNC(strlcpy, found_strlcpy=yes, found_strlcpy=no)
+if test "x$found_strlcpy" = xno; then
+	dnl check libbsd for strlcpy
+	PKG_CHECK_MODULES([BSD], [libbsd >= 0])
+	AC_SEARCH_LIBS(strlcpy, bsd,
+					[
+						found_bsd_strlcpy=yes
+						CFLAGS="$BSD_CFLAGS $CFLAGS"
+						LIBS="$BSD_LIBS $LIBS"
+					],
+					found_bsd_strlcpy=no)
+fi
+
+if test "x$found_strlcpy" = xno && test "x$found_bsd_strlcpy" = xno; then
+	AC_MSG_ERROR(cannot find strlcpy - upgrade your libc or install libbsd)
+fi
 
 dnl Needed for normal compile
 AC_PROG_INSTALL