From 038e5ecc76578a9ca54cc7f8e211b5253093287c Mon Sep 17 00:00:00 2001
From: Bruce Richardson <bruce.richardson@intel.com>
Date: Thu, 29 Mar 2018 14:54:34 +0100
Subject: [PATCH] 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>
---
 examples/meson.build | 45 +++++++++++++++++++++++++++++++-------------
 1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/examples/meson.build b/examples/meson.build
index 2c6b3f889c..16c3ab0052 100644
--- 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
-- 
2.20.1