Allow --boards to add to not replace the set of enabled boards

The following already work:

Build all boards that are enabled by default:
./build build

Build a specific set of boards:
./build --boards beaver,jetson-tk1 build

Sometimes it's nice to build all boards that are enabled by default,
plus a few others which aren't. This patch enables the following syntax
for that:
./build --boards +jetson-tk1 build

Signed-off-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/build b/build
index 7bfc2d9..5e94474 100755
--- a/build
+++ b/build
@@ -108,9 +108,17 @@ def user_restrict_socs(enabled_socs):
         socs[socname]['disabled'] = not socname in enabled_socs
 
 def user_restrict_boards(enabled_boards):
+    if enabled_boards[0] == '+':
+        disable_others = False
+        enabled_boards = enabled_boards[1:]
+    else:
+        disable_others = True
     enabled_boards = enabled_boards.split(',')
     for boardname in boards.keys():
-        boards[boardname]['disabled'] = not boardname in enabled_boards
+        if boardname in enabled_boards:
+            boards[boardname]['disabled'] = False
+        elif disable_others:
+            boards[boardname]['disabled'] = True
 
 def restrict_boards():
     for board in boards.values():