[dpdk-stable] [PATCH] port: fix missing pcap support with meson

[Bruce Richardson]

The meson build was missing the define to enable pcap port support if
libpcap (development) package was found on the build platform. Rather than
duplicating the checks for libpcap found in the pcap net PMD build file, we
can move the checks to the top-level config directory and reference the
RTE_PCAP_PORT setting elsewhere in the build.

Bugzilla ID: 351
Fixes: 5b9656b157d3 ("lib: build with meson")

Cc: stable at dpdk.org
Reported-by: Cristian Bidea <cristian.bidea at keysight.com>
Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 config/meson.build           | 13 +++++++++++++
 drivers/net/pcap/meson.build | 18 +++---------------
 lib/librte_port/meson.build  |  4 ++++
 3 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/config/meson.build b/config/meson.build
index 2bafea530..f9ae632cf 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -138,6 +138,19 @@ if libbsd.found()
 	dpdk_conf.set('RTE_USE_LIBBSD', 1)
 endif
 
+# check for pcap
+pcap_dep = dependency('pcap', required: false)
+if pcap_dep.found()
+	# pcap got a pkg-config file only in 1.9.0 and before that meson uses
+	# an internal pcap-config finder, which is not compatible with
+	# cross-compilation, so try to fallback to find_library
+	pcap_dep = cc.find_library('pcap', required: false)
+endif
+if pcap_dep.found() and cc.has_header('pcap.h', dependencies: pcap_dep)
+	dpdk_conf.set('RTE_PORT_PCAP', 1)
+	dpdk_extra_ldflags += '-lpcap'
+endif
+
 # add -include rte_config to cflags
 add_project_arguments('-include', 'rte_config.h', language: 'c')
 
diff --git a/drivers/net/pcap/meson.build b/drivers/net/pcap/meson.build
index 910dfab9b..b680710aa 100644
--- a/drivers/net/pcap/meson.build
+++ b/drivers/net/pcap/meson.build
@@ -1,21 +1,9 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-pcap_dep = dependency('pcap', required: false)
-if pcap_dep.found()
-	build = true
-else
-	# pcap got a pkg-config file only in 1.9.0 and before that meson uses
-	# an internal pcap-config finder, which is not compatible with
-	# cross-compilation, so try to fallback to find_library
-	pcap_dep = cc.find_library('pcap', required: false)
-	if pcap_dep.found() and cc.has_header('pcap.h', dependencies: pcap_dep)
-		build = true
-		pkgconfig_extra_libs += '-lpcap'
-	else
-		build = false
-		reason = 'missing dependency, "libpcap"'
-	endif
+if not dpdk_conf.has('RTE_PORT_PCAP')
+	build = false
+	reason = 'missing dependency, "libpcap"'
 endif
 sources = files('rte_eth_pcap.c')
 ext_deps += pcap_dep
diff --git a/lib/librte_port/meson.build b/lib/librte_port/meson.build
index 0d11456f0..1b48127c1 100644
--- a/lib/librte_port/meson.build
+++ b/lib/librte_port/meson.build
@@ -23,6 +23,10 @@ headers = files(
 	'rte_port_sym_crypto.h')
 deps += ['ethdev', 'sched', 'ip_frag', 'cryptodev']
 
+if dpdk_conf.has('RTE_PORT_PCAP')
+	ext_deps += pcap_dep # dependency provided in config/meson.build
+endif
+
 if dpdk_conf.has('RTE_LIBRTE_KNI')
 	sources += files('rte_port_kni.c')
 	headers += files('rte_port_kni.h')
-- 
2.21.0