[rtems-source-builder commit] sb: Add a defined check.

[Chris Johns]

Module:    rtems-source-builder
Branch:    master
Commit:    9b54dd8e185291f6656fca3f38da1c38947c8dd6
Changeset: http://git.rtems.org/rtems-source-builder/commit/?id=9b54dd8e185291f6656fca3f38da1c38947c8dd6

Author:    Chris Johns <chrisj at rtems.org>
Date:      Fri Oct 27 17:22:12 2017 +1100

sb: Add a defined check.

Updates #3210.

---

 source-builder/sb/macros.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source-builder/sb/macros.py b/source-builder/sb/macros.py
index 2af8d36..28a52b2 100644
--- a/source-builder/sb/macros.py
+++ b/source-builder/sb/macros.py
@@ -447,6 +447,9 @@ class macros:
             if key in self.macros[map]:
                 del self.macros[map][key]
 
+    def defined(self, key, globals = True, maps = None):
+        return self.get(key, globals, maps) is not None
+
     def expand(self, _str):
         """Simple basic expander of config file macros."""
         expanded = True