tools: add an option to generate cscope database

When --cscope option is given to Scons, it will generate a cscope
cross-reference database in current directory, which is useful in
Vim(and other cscope-aware text editors). For example, `scons -s
--cscope` will do nothing except generating the database. You can use
this option with other options together.

It is inspired by the `make cscope` of Linux.

1 files changed, 9 insertions, 0 deletions

diff --git a/tools/building.py b/tools/building.py
index a90ad69c1d..6b752674b5 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -83,6 +83,11 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
                       action='store_true',
                       default=False,
                       help='copy header of rt-thread directory to local.')
+    AddOption('--cscope',
+                      dest='cscope',
+                      action='store_true',
+                      default=False,
+                      help='Build Cscope cross reference database. Requires cscope installed.')
 
     # add build library option
     AddOption('--buildlib', 
@@ -341,6 +346,10 @@ def EndBuilding(target, program = None):
     if GetOption('copy-header') and program != None:
         MakeCopyHeader(program)
 
+    if GetOption('cscope'):
+        from cscope import CscopeDatabase
+        CscopeDatabase(Projects)
+
 def SrcRemove(src, remove):
     if type(src[0]) == type('str'):
         for item in src: