[dpdk-dev] [PATCH v2 2/3] build: use dependency() instead of find_library()

[Luca Boccassi <bluca@debian.org>]

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 superfluos and
take extra time, and avoid adding the linker flag manually which causes
it to be duplicated.

An internal checker has been added to Meson 0.42 to detect libpcap,
which ships a custom tool rather than a pkg-config file, so bump the
minimum Meson version from 0.41 to 0.42.

Signed-off-by: Luca Boccassi <bluca@debian.org>
---
v2: split libbsd change in a separate commit, remove CC to stable
    as a meson bump will be required

 drivers/crypto/ccp/meson.build     | 1 -
 drivers/crypto/openssl/meson.build | 1 -
 drivers/crypto/qat/meson.build     | 1 -
 drivers/meson.build                | 2 +-
 drivers/net/bnx2x/meson.build      | 2 +-
 drivers/net/mlx4/meson.build       | 6 +++---
 drivers/net/mlx5/meson.build       | 6 +++---
 drivers/net/pcap/meson.build       | 5 ++---
 lib/librte_bpf/meson.build         | 4 ++--
 lib/librte_telemetry/meson.build   | 2 +-
 meson.build                        | 2 +-
 11 files changed, 14 insertions(+), 18 deletions(-)

diff --git a/drivers/crypto/ccp/meson.build b/drivers/crypto/ccp/meson.build
index e43b00591..915c4c854 100644
--- 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'
diff --git a/drivers/crypto/openssl/meson.build b/drivers/crypto/openssl/meson.build
index c2a0dd8ba..80e5e8835 100644
--- 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'
diff --git a/drivers/crypto/qat/meson.build b/drivers/crypto/qat/meson.build
index 9cc98d2c2..21f969735 100644
--- 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
diff --git a/drivers/meson.build b/drivers/meson.build
index c3c66bbc0..91bc6dc3f 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -46,7 +46,7 @@ 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
+		# using dependency() (preferred) or 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
diff --git a/drivers/net/bnx2x/meson.build b/drivers/net/bnx2x/meson.build
index e3c688869..dd189ffc4 100644
--- 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'
diff --git a/drivers/net/mlx4/meson.build b/drivers/net/mlx4/meson.build
index 7de571e2a..4ba4e93b6 100644
--- 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
diff --git a/drivers/net/mlx5/meson.build b/drivers/net/mlx5/meson.build
index 8ba19e818..161c5641f 100644
--- 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
diff --git a/drivers/net/pcap/meson.build b/drivers/net/pcap/meson.build
index 0c4e0201a..89c9d7a74 100644
--- 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'
diff --git a/lib/librte_bpf/meson.build b/lib/librte_bpf/meson.build
index bc0cd78f9..c3b1f698e 100644
--- 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
diff --git a/lib/librte_telemetry/meson.build b/lib/librte_telemetry/meson.build
index 9492f544e..cafb26f08 100644
--- a/lib/librte_telemetry/meson.build
+++ b/lib/librte_telemetry/meson.build
@@ -6,7 +6,7 @@ headers = files('rte_telemetry.h', 'rte_telemetry_internal.h', 'rte_telemetry_pa
 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']
diff --git a/meson.build b/meson.build
index d500507c5..35126106a 100644
--- a/meson.build
+++ b/meson.build
@@ -5,7 +5,7 @@ project('DPDK', 'C',
 	version: '19.02.0-rc1',
 	license: 'BSD',
 	default_options: ['buildtype=release', 'default_library=static'],
-	meson_version: '>= 0.41'
+	meson_version: '>= 0.42'
 )
 
 # set up some global vars for compiler, platform, configuration, etc.
-- 
2.20.1