build: export include directories list

In order to perform things like LTO more easily in our DPDK applications,
we use DPDK as a meson subproject.
Export include directories list in order to be usable in this context.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

drivers/meson.build

@@ -174,6 +174,10 @@ foreach subpath:subdirs
             install_headers(driver_sdk_headers)
         endif
 
+        if headers.length() > 0
+            dpdk_includes += include_directories(drv_path)
+        endif
+
         # generate pmdinfo sources by building a temporary
         # lib and then running pmdinfogen on the contents of
         # that lib. The final lib reuses the object files and

lib/meson.build

@@ -189,6 +189,7 @@ foreach l:libraries
 
     libname = 'rte_' + name
     includes += include_directories(l)
+    dpdk_includes += include_directories(l)
 
     if developer_mode and is_windows and use_function_versioning
         message('@0@: Function versioning is not supported by Windows.'.format(name))

meson.build

@@ -32,6 +32,7 @@ cc = meson.get_compiler('c')
 dpdk_source_root = meson.current_source_dir()
 dpdk_build_root = meson.current_build_dir()
 dpdk_conf = configuration_data()
+dpdk_includes = []
 dpdk_libraries = []
 dpdk_static_libraries = []
 dpdk_shared_lib_deps = []