Author: Luca Boccassi <bluca@debian.org>
Description: use dependency() instead of find_library()
 Whenever possible (if the library ships a pkg-config file) use meson's
 dependency() function to look for it, as it will automatically add it
 to the Requires.private list if needed, to allow for static builds to
 succeed for reverse dependencies of DPDK. Otherwise the recursive
 dependencies are not parsed, and users doing static builds have to
 resolve them manually by themselves.
 When using this API avoid additional checks that are superfluous and
 take extra time, and avoid adding the linker flag manually which causes
 it to be duplicated.
Origin: https://patches.dpdk.org/patch/49996/
--- a/drivers/crypto/ccp/meson.build
+++ b/drivers/crypto/ccp/meson.build
@@ -18,4 +18,3 @@ sources = files('rte_ccp_pmd.c',
 		'ccp_pmd_ops.c')
 
 ext_deps += dep
-pkgconfig_extra_libs += '-lcrypto'
--- a/drivers/crypto/openssl/meson.build
+++ b/drivers/crypto/openssl/meson.build
@@ -8,4 +8,3 @@ endif
 deps += 'bus_vdev'
 sources = files('rte_openssl_pmd.c', 'rte_openssl_pmd_ops.c')
 ext_deps += dep
-pkgconfig_extra_libs += '-lcrypto'
--- a/drivers/crypto/qat/meson.build
+++ b/drivers/crypto/qat/meson.build
@@ -13,6 +13,5 @@ if dep.found()
 			     'qat_sym.c',
 			     'qat_sym_session.c')
 	qat_ext_deps += dep
-	pkgconfig_extra_libs += '-lcrypto'
 	qat_cflags += '-DBUILD_QAT_SYM'
 endif
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -46,10 +46,11 @@ foreach class:driver_classes
 		# set up internal deps. Drivers can append/override as necessary
 		deps = std_deps
 		# ext_deps: Stores external library dependency got
-		# using dependency() or cc.find_library(). For most cases, we
-		# probably also need to specify the "-l" flags in
-		# pkgconfig_extra_libs variable too, so that it can be reflected
-		# in the pkgconfig output for static builds
+		# using dependency() (preferred) or find_library().
+		# For the find_library() case (but not with dependency()) we also
+		# need to specify the "-l" flags in pkgconfig_extra_libs variable
+		# too, so that it can be reflected in the pkgconfig output for
+		# static builds.
 		ext_deps = []
 		pkgconfig_extra_libs = []
 
--- a/drivers/net/bnx2x/meson.build
+++ b/drivers/net/bnx2x/meson.build
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Intel Corporation
 
-dep = cc.find_library('z', required: false)
+dep = dependency('zlib', required: false)
 build = dep.found()
 ext_deps += dep
 cflags += '-DZLIB_CONST'
--- a/drivers/net/mlx4/meson.build
+++ b/drivers/net/mlx4/meson.build
@@ -14,9 +14,9 @@ if pmd_dlopen
 	]
 endif
 libs = [
-	cc.find_library('mnl', required:false),
-	cc.find_library('mlx4', required:false),
-	cc.find_library('ibverbs', required:false),
+	dependency('libmnl', required:false),
+	dependency('libmlx4', required:false),
+	dependency('libibverbs', required:false),
 ]
 build = true
 foreach lib:libs
--- a/drivers/net/mlx5/meson.build
+++ b/drivers/net/mlx5/meson.build
@@ -14,9 +14,9 @@ if pmd_dlopen
 	]
 endif
 libs = [
-	cc.find_library('mnl', required:false),
-	cc.find_library('mlx5', required:false),
-	cc.find_library('ibverbs', required:false),
+	dependency('libmnl', required:false),
+	dependency('libmlx5', required:false),
+	dependency('libibverbs', required:false),
 ]
 build = true
 foreach lib:libs
--- a/drivers/net/pcap/meson.build
+++ b/drivers/net/pcap/meson.build
@@ -1,12 +1,11 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-pcap_dep = cc.find_library('pcap', required: false)
-if pcap_dep.found() and cc.has_header('pcap.h', dependencies: pcap_dep)
+pcap_dep = dependency('pcap', required: false)
+if pcap_dep.found()
 	build = true
 else
 	build = false
 endif
 sources = files('rte_eth_pcap.c')
 ext_deps += pcap_dep
-pkgconfig_extra_libs += '-lpcap'
--- a/lib/librte_bpf/meson.build
+++ b/lib/librte_bpf/meson.build
@@ -18,8 +18,8 @@ install_headers = files('bpf_def.h',
 
 deps += ['mbuf', 'net', 'ethdev']
 
-dep = cc.find_library('elf', required: false)
-if dep.found() == true and cc.has_header('libelf.h', dependencies: dep)
+dep = dependency('libelf', required: false)
+if dep.found()
 	sources += files('bpf_load_elf.c')
 	ext_deps += dep
 endif
--- a/lib/librte_telemetry/meson.build
+++ b/lib/librte_telemetry/meson.build
@@ -6,7 +6,7 @@ headers = files('rte_telemetry.h', 'rte_
 deps += ['metrics', 'ethdev']
 cflags += '-DALLOW_EXPERIMENTAL_API'
 
-jansson = cc.find_library('jansson', required: false)
+jansson = dependency('jansson', required: false)
 if jansson.found()
 	ext_deps += jansson
 	dpdk_app_link_libraries += ['telemetry']
--- a/drivers/compress/zlib/meson.build
+++ b/drivers/compress/zlib/meson.build
@@ -9,6 +9,5 @@ endif
 deps += 'bus_vdev'
 sources = files('zlib_pmd.c', 'zlib_pmd_ops.c')
 ext_deps += dep
-pkgconfig_extra_libs += '-lz'
 
 allow_experimental_apis = true