[dpdk-dev] [PATCH] build: set RTE_ARCH_64 based on pointer size

[Bruce Richardson <bruce.richardson@intel.com>]

Rather than relying on the target machine architecture, use the
size of a pointer from the compiler to determine if we are 64-bits
or not. This allows correct behaviour when you pass -m32 as a compile
option. It also allows us to use this value repeatedly throughout the
repo rather than continually testing for the sizeof(void*).

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 config/arm/meson.build      | 3 +--
 config/meson.build          | 5 ++++-
 config/ppc_64/meson.build   | 4 +++-
 config/x86/meson.build      | 3 +--
 drivers/net/sfc/meson.build | 2 +-
 lib/librte_bpf/meson.build  | 2 +-
 lib/librte_kni/meson.build  | 2 +-
 7 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/config/arm/meson.build b/config/arm/meson.build
index 94cca490e..5a1b79a15 100644
--- a/config/arm/meson.build
+++ b/config/arm/meson.build
@@ -85,14 +85,13 @@ impl_dpaa2 = ['NXP DPAA2', flags_dpaa2, machine_args_generic]
 
 dpdk_conf.set('RTE_FORCE_INTRINSICS', 1)
 
-if cc.sizeof('void *') != 8
+if not dpdk_conf.get('RTE_ARCH_64')
 	dpdk_conf.set('RTE_CACHE_LINE_SIZE', 64)
 	dpdk_conf.set('RTE_ARCH_ARM', 1)
 	dpdk_conf.set('RTE_ARCH_ARMv7', 1)
 else
 	dpdk_conf.set('RTE_CACHE_LINE_SIZE', 128)
 	dpdk_conf.set('RTE_ARCH_ARM64', 1)
-	dpdk_conf.set('RTE_ARCH_64', 1)
 
 	machine = []
 	cmd_generic = ['generic', '', '', 'default', '']
diff --git a/config/meson.build b/config/meson.build
index 6f9228c87..172ab0249 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -21,6 +21,8 @@ toolchain = cc.get_id()
 dpdk_conf.set_quoted('RTE_TOOLCHAIN', toolchain)
 dpdk_conf.set('RTE_TOOLCHAIN_' + toolchain.to_upper(), 1)
 
+dpdk_conf.set('RTE_ARCH_64', cc.sizeof('void *') == 8)
+
 # use pthreads
 add_project_link_arguments('-pthread', language: 'c')
 dpdk_extra_ldflags += '-pthread'
@@ -65,7 +67,7 @@ warning_flags = [
 	'-Wcast-qual',
 	'-Wno-address-of-packed-member'
 ]
-if cc.sizeof('void *') == 4
+if not dpdk_conf.get('RTE_ARCH_64')
 # for 32-bit, don't warn about casting a 32-bit pointer to 64-bit int - it's fine!!
 	warning_flags += '-Wno-pointer-to-int-cast'
 endif
@@ -85,6 +87,7 @@ dpdk_conf.set('RTE_MAX_VFIO_GROUPS', 64)
 dpdk_conf.set('RTE_DRIVER_MEMPOOL_BUCKET_SIZE_KB', 64)
 dpdk_conf.set('RTE_LIBRTE_DPAA2_USE_PHYS_IOVA', true)
 
+
 compile_time_cpuflags = []
 if host_machine.cpu_family().startswith('x86')
 	arch_subdir = 'x86'
diff --git a/config/ppc_64/meson.build b/config/ppc_64/meson.build
index e207c438b..7ceae1d39 100644
--- a/config/ppc_64/meson.build
+++ b/config/ppc_64/meson.build
@@ -1,9 +1,11 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Luca Boccassi <bluca@debian.org>
 
+if not dpdk_conf.get('RTE_ARCH_64')
+	error('Only 64-bit compiles are supported for this platform type')
+endif
 dpdk_conf.set('RTE_ARCH', 'ppc_64')
 dpdk_conf.set('RTE_ARCH_PPC_64', 1)
-dpdk_conf.set('RTE_ARCH_64', 1)
 
 # overrides specific to ppc64
 dpdk_conf.set('RTE_MAX_LCORE', 256)
diff --git a/config/x86/meson.build b/config/x86/meson.build
index 33efb5e54..084328da2 100644
--- a/config/x86/meson.build
+++ b/config/x86/meson.build
@@ -19,10 +19,9 @@ foreach f:base_flags
 endforeach
 
 dpdk_conf.set('RTE_ARCH_X86', 1)
-if (host_machine.cpu_family() == 'x86_64')
+if dpdk_conf.get('RTE_ARCH_64')
 	dpdk_conf.set('RTE_ARCH_X86_64', 1)
 	dpdk_conf.set('RTE_ARCH', 'x86_64')
-	dpdk_conf.set('RTE_ARCH_64', 1)
 else
 	dpdk_conf.set('RTE_ARCH_I686', 1)
 	dpdk_conf.set('RTE_ARCH', 'i686')
diff --git a/drivers/net/sfc/meson.build b/drivers/net/sfc/meson.build
index 2d34e869d..e67560991 100644
--- a/drivers/net/sfc/meson.build
+++ b/drivers/net/sfc/meson.build
@@ -6,7 +6,7 @@
 # This software was jointly developed between OKTET Labs (under contract
 # for Solarflare) and Solarflare Communications, Inc.
 
-if arch_subdir != 'x86' or cc.sizeof('void *') == 4
+if arch_subdir != 'x86' or not dpdk_conf.get('RTE_ARCH_64')
 	build = false
 endif
 
diff --git a/lib/librte_bpf/meson.build b/lib/librte_bpf/meson.build
index bc0cd78f9..4fbb29d7c 100644
--- a/lib/librte_bpf/meson.build
+++ b/lib/librte_bpf/meson.build
@@ -8,7 +8,7 @@ sources = files('bpf.c',
 		'bpf_pkt.c',
 		'bpf_validate.c')
 
-if arch_subdir == 'x86' and cc.sizeof('void *') == 8
+if arch_subdir == 'x86' and dpdk_conf.get('RTE_ARCH_64')
 	sources += files('bpf_jit_x86.c')
 endif
 
diff --git a/lib/librte_kni/meson.build b/lib/librte_kni/meson.build
index a738a033a..055ae1227 100644
--- a/lib/librte_kni/meson.build
+++ b/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 cc.sizeof('void *') == 4
+if host_machine.system() != 'linux' or not dpdk_conf.get('RTE_ARCH_64')
 	build = false
 endif
 version = 2
-- 
2.17.1