build: increase readability via shortcut variables

Define variables for "is_linux", "is_freebsd" and "is_windows"
to make the code shorter for comparisons and more readable.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
Acked-by: Luca Boccassi <bluca@debian.org>

app/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017-2019 Intel Corporation
 
-if host_machine.system() == 'windows'
+if is_windows
 	subdir_done()
 endif
 

buildtools/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017-2019 Intel Corporation
 
-if host_machine.system() == 'windows'
+if is_windows
 	subdir_done()
 endif
 

config/meson.build

@@ -8,6 +8,12 @@ if not supported_exec_envs.contains(exec_env)
 	error('unsupported system type "@0@"'.format(exec_env))
 endif
 
+# define a handy variable for checking which OS we have.
+# gives us "is_windows", "is_freebsd" and "is_linux"
+foreach env:supported_exec_envs
+	set_variable('is_' + env, exec_env == env)
+endforeach
+
 # set the major version, which might be used by drivers and libraries
 # depending on the configuration options
 pver = meson.project_version().split('.')
@@ -95,9 +101,9 @@ if cc.find_library('libm', required : false).found()
 endif
 
 # for linux link against dl, for bsd execinfo
-if host_machine.system() == 'linux'
+if is_linux
 	link_lib = 'dl'
-elif host_machine.system() == 'freebsd'
+elif is_freebsd
 	link_lib = 'execinfo'
 else
 	link_lib = ''
@@ -120,7 +126,7 @@ if numa_dep.found() and cc.has_header('numaif.h')
 endif
 
 # check for strlcpy
-if host_machine.system() == 'linux'
+if is_linux
 	libbsd = dependency('libbsd', required: false)
 	if libbsd.found()
 		dpdk_conf.set('RTE_USE_LIBBSD', 1)
@@ -175,4 +181,4 @@ dpdk_conf.set_quoted('RTE_EAL_PMD_PATH', eal_pmd_path)
 install_headers('rte_config.h', subdir: get_option('include_subdir_arch'))
 
 # enable VFIO only if it is linux OS
-dpdk_conf.set('RTE_EAL_VFIO', host_machine.system() == 'linux')
+dpdk_conf.set('RTE_EAL_VFIO', is_linux)

config/x86/meson.build

@@ -5,7 +5,7 @@
 march_opt = ['-march=@0@'.format(machine)]
 
 # get binutils version for the workaround of Bug 97
-if host_machine.system() != 'windows'
+if not is_windows
 	ldver = run_command('ld', '-v').stdout().strip()
 	if ldver.contains('2.30')
 		if cc.has_argument('-mno-avx512f')

doc/guides/contributing/coding_style.rst

@@ -856,7 +856,7 @@ build
 
 .. code-block:: python
 
-	if host_machine.system() != 'linux'
+	if not is_linux
 	        build = false
 	endif
 

drivers/bus/dpaa/meson.build

@@ -3,7 +3,7 @@
 
 version = 2
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/bus/fslmc/meson.build

@@ -3,7 +3,7 @@
 
 version = 2
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/bus/pci/meson.build

@@ -8,7 +8,7 @@ install_headers('rte_bus_pci.h')
 sources = files('pci_common.c',
 	'pci_common_uio.c',
 	'pci_params.c')
-if host_machine.system() == 'linux'
+if is_linux
 	sources += files('linux/pci.c',
 			'linux/pci_uio.c',
 			'linux/pci_vfio.c')

drivers/bus/vmbus/meson.build

@@ -11,7 +11,7 @@ sources = files('vmbus_common.c',
 		'vmbus_bufring.c',
 		'vmbus_common_uio.c')
 
-if host_machine.system() == 'linux'
+if is_linux
 	sources += files('linux/vmbus_bus.c',
 			'linux/vmbus_uio.c')
 	includes += include_directories('linux')

drivers/common/dpaax/meson.build

@@ -3,7 +3,7 @@
 
 allow_experimental_apis = true
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/crypto/caam_jr/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 NXP
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/crypto/ccp/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Advanced Micro Devices, Inc. All rights reserved.
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 dep = dependency('libcrypto', required: false)

drivers/crypto/dpaa2_sec/meson.build

@@ -3,7 +3,7 @@
 
 version = 2
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/crypto/dpaa_sec/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 NXP
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/crypto/octeontx/meson.build

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Cavium, Inc
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 

drivers/event/dpaa/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 NXP
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 deps += ['pmd_dpaa']

drivers/event/dpaa2/meson.build

@@ -3,7 +3,7 @@
 
 version = 2
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 deps += ['bus_vdev', 'pmd_dpaa2', 'pmd_dpaa2_sec']

drivers/mempool/dpaa/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 NXP
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/mempool/dpaa2/meson.build

@@ -3,7 +3,7 @@
 
 version = 2
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017-2019 Intel Corporation
 
-if host_machine.system() == 'windows'
+if is_windows
 	subdir_done()
 endif
 

drivers/net/af_packet/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 sources = files('rte_eth_af_packet.c')

drivers/net/avp/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Intel Corporation
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 sources = files('avp_ethdev.c')

drivers/net/axgbe/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright (c) 2018 Advanced Micro Devices, Inc. All rights reserved.
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 

drivers/net/dpaa/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 NXP
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 deps += ['mempool_dpaa']

drivers/net/dpaa2/meson.build

@@ -3,7 +3,7 @@
 
 version = 2
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 

drivers/net/enetc/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 NXP
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 

drivers/net/failsafe/meson.build

@@ -5,7 +5,7 @@ cflags += '-std=gnu99'
 cflags += '-D_DEFAULT_SOURCE'
 cflags += '-D_XOPEN_SOURCE=700'
 cflags += '-pedantic'
-if host_machine.system() == 'linux'
+if is_linux
 	cflags += '-DLINUX'
 else
 	cflags += '-DBSD'

drivers/net/nfp/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Intel Corporation
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 sources = files('nfpcore/nfp_cpp_pcie_ops.c',

drivers/net/softnic/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Intel Corporation
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 allow_experimental_apis = true

drivers/net/tap/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright 2018 Luca Boccassi <bluca@debian.org>
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 sources = files(

drivers/net/vdev_netvsc/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Luca Boccassi <bluca@debian.org>
 
-if host_machine.system() != 'linux'
+if not is_linux
         build = false
 endif
 sources = files('vdev_netvsc.c')

drivers/net/virtio/meson.build

@@ -15,7 +15,7 @@ elif arch_subdir == 'arm' and host_machine.cpu_family().startswith('aarch64')
 	sources += files('virtio_rxtx_simple_neon.c')
 endif
 
-if host_machine.system() == 'linux'
+if is_linux
 	dpdk_conf.set('RTE_VIRTIO_USER', 1)
 
 	sources += files('virtio_user_ethdev.c',

examples/l3fwd-power/meson.build

@@ -6,7 +6,7 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 allow_experimental_apis = true

examples/meson.build

@@ -36,7 +36,7 @@ foreach example: examples
 	ext_deps = [execinfo]
 	includes = [include_directories(example)]
 	deps = ['eal', 'mempool', 'net', 'mbuf', 'ethdev', 'cmdline']
-	if host_machine.system() == 'windows'
+	if is_windows
 		deps = ['eal'] # only supported lib on Windows currently
 	endif
 	subdir(example)

examples/tep_termination/meson.build

@@ -6,7 +6,7 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 deps += ['hash', 'vhost']

examples/vdpa/meson.build

@@ -6,11 +6,11 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 deps += 'vhost'
 allow_experimental_apis = true
 sources = files(
 	'main.c'
-)
+)

examples/vhost/meson.build

@@ -6,7 +6,7 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 deps += 'vhost'

examples/vhost_scsi/meson.build

@@ -6,7 +6,7 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 

kernel/meson.build

@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-subdir(host_machine.system())
+subdir(exec_env)

lib/librte_eventdev/meson.build

@@ -4,7 +4,7 @@
 version = 6
 allow_experimental_apis = true
 
-if host_machine.system() == 'linux'
+if is_linux
 	cflags += '-DLINUX'
 else
 	cflags += '-DBSD'

lib/librte_kni/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-if host_machine.system() != 'linux' or not dpdk_conf.get('RTE_ARCH_64')
+if not is_linux or not dpdk_conf.get('RTE_ARCH_64')
 	build = false
 endif
 version = 2

lib/librte_power/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 sources = files('rte_power.c', 'power_acpi_cpufreq.c',

lib/librte_vhost/meson.build

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017-2018 Intel Corporation
 
-if host_machine.system() != 'linux'
+if not is_linux
 	build = false
 endif
 if has_libnuma == 1

lib/meson.build

@@ -30,7 +30,7 @@ libraries = [
 	# flow_classify lib depends on pkt framework table lib
 	'flow_classify', 'bpf', 'telemetry']
 
-if host_machine.system() == 'windows'
+if is_windows
 	libraries = ['kvargs','eal'] # only supported libraries for windows
 endif
 
@@ -123,7 +123,7 @@ foreach l:libraries
 					meson.current_source_dir(), dir_name, name)
 			exports = []
 			implib = dir_name + '.dll.a'
-			if host_machine.system() == 'windows'
+			if is_windows
 				exports = '@0@/@1@/rte_@2@_exports.def'.format(
 					meson.current_source_dir(), dir_name, name)
 				lk_args = ['-Wl,/def:' + exports, '-Wl,/implib:lib\\' + implib]