buildroot/package/netsniff-ng/0001-Detect-libpcap-dependencies-using-pkg-config.patch

From 194ec61843b9598ce90873c812b817c4b96e2e0d Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@tkos.co.il>
Date: Thu, 2 Sep 2021 12:56:00 +0300
Subject: [PATCH] Detect libpcap dependencies using pkg-config

When building statically the link command line must include all
dependencies of all libraries. libpcap can optionally depend on libnl.
mausezahn can't build statically in this case.

Use pkg-config in configure and in the link command to construct the
library flags we need to link with libpcap.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
---
Upstream status: commit 194ec61843b9598ce90873c812b817c4b96e2e0d

 configure          | 4 +++-
 mausezahn/Makefile | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 510826a798f5..598ae2433a7a 100755
--- a/configure
+++ b/configure
@@ -588,7 +588,9 @@ int main(void)
 }
 EOF
 
-	$CC -o $TMPDIR/pcaptest $TMPDIR/pcaptest.c -lpcap >> config.log 2>&1
+	$CC -o $TMPDIR/pcaptest $TMPDIR/pcaptest.c \
+		$($PKG_CONFIG --libs libpcap 2>> config.log) \
+		>> config.log 2>&1
 	if [ ! -x $TMPDIR/pcaptest ] ; then
 		echo "[NO]"
 		echo "CONFIG_LIBPCAP=0" >> Config
diff --git a/mausezahn/Makefile b/mausezahn/Makefile
index ca16b6579583..9544565355cc 100644
--- a/mausezahn/Makefile
+++ b/mausezahn/Makefile
@@ -1,6 +1,6 @@
 mausezahn-libs =	-lcli \
 			-lnet \
-			-lpcap \
+			$(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) $(PKG_CONFIG) --libs libpcap 2> /dev/null ) \
 			-lrt \
 			-lpthread \
 			-lm
-- 
2.33.0