examples: allow building all as part of meson build

To test building all relevant example applications as part of a build, we
add support for the "all" keyword to be passed to the "examples" build
option. Since not all examples can actually be built on all systems,
we also add support for the "build" option inside the sub-dirs. However,
in case where "all" is not used, and a particular example is requested
to be built, we will error out if building the requested app is not
possible.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Tested-by: Harry van Haaren <harry.van.haaren@intel.com>

diff --git a/examples/meson.build b/examples/meson.build
index 2c6b3f8..16c3ab0 100644 (file)
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -7,8 +7,20 @@ if get_option('default_library') == 'static'
 endif
 
 execinfo = cc.find_library('execinfo', required: false)
-foreach example: get_option('examples').split(',')
+
+allow_skips = true # don't flag an error if we can't build an app
+
+if get_option('examples').to_lower() == 'all'
+       dirs = run_command('sh', '-c',
+               'cd $MESON_SOURCE_ROOT/$MESON_SUBDIR && for d in * ; do if [ -d $d ] ; then echo $d ; fi ; done')
+       examples = dirs.stdout().split()
+else
+       examples = get_option('examples').split(',')
+       allow_skips = false # error out if we can't build a requested app
+endif
+foreach example: examples
        name = example
+       build = true
        sources = []
        allow_experimental_apis = false
        cflags = machine_args
@@ -17,17 +29,24 @@ foreach example: get_option('examples').split(',')
        deps = ['eal', 'mempool', 'net', 'mbuf', 'ethdev', 'cmdline']
        subdir(example)
 
-       dep_objs = ext_deps
-       foreach d:deps
-               dep_objs += [get_variable(get_option('default_library') + '_rte_' + d)]
-       endforeach
-       if allow_experimental_apis
-               cflags += '-DALLOW_EXPERIMENTAL_API'
+       if build
+               dep_objs = ext_deps
+               foreach d:deps
+                       dep_objs += [get_variable(
+                               get_option('default_library') + '_rte_' + d)]
+               endforeach
+               if allow_experimental_apis
+                       cflags += '-DALLOW_EXPERIMENTAL_API'
+               endif
+               executable('dpdk-' + name, sources,
+                       include_directories: includes,
+                       link_whole: driver_libs,
+                       link_args: dpdk_extra_ldflags,
+                       c_args: cflags,
+                       dependencies: dep_objs)
+       elif not allow_skips
+               error('Cannot build requested example "' + name + '"')
+       else
+               message('Skipping example "' + name + '"')
        endif
-       executable('dpdk-' + name, sources,
-               include_directories: includes,
-               link_whole: driver_libs,
-               link_args: dpdk_extra_ldflags,
-               c_args: cflags,
-               dependencies: dep_objs)
 endforeach