build: pass cflags in subproject

When DPDK is used as a subproject, include the required compile
arguments so that the parent project is also built with the appropriate
cflags (most importantly -march). Use the same cflags as pkg-config.

Fixes: f93a605 ("build: add definitions for use as Meson subproject")
Cc: stable@dpdk.org

Signed-off-by: Robin Jarry <rjarry@redhat.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

buildtools/subproject/meson.build

@@ -2,17 +2,23 @@
 # Copyright(c) 2022 Intel Corporation
 
 message('DPDK subproject linking: ' + get_option('default_library'))
+subproject_cflags = ['-include', 'rte_config.h'] + machine_args
+if is_freebsd
+    subproject_cflags += ['-D__BSD_VISIBLE']
+endif
 if get_option('default_library') == 'static'
     dpdk_dep = declare_dependency(
             version: meson.project_version(),
             dependencies: dpdk_static_lib_deps,
+            compile_args: subproject_cflags,
             # static library deps in DPDK build don't include "link_with" parameters,
             # so explicitly link-in both libs and drivers
             link_whole: dpdk_static_libraries + dpdk_drivers,
             link_args: dpdk_extra_ldflags)
 else
     dpdk_dep = declare_dependency(
             version: meson.project_version(),
+            compile_args: subproject_cflags,
             # shared library deps include all necessary linking parameters
             dependencies: dpdk_shared_lib_deps)
 endif