Fix issue 108 <http://code.google.com/p/distcc/issues/detail?id=108>:

include_server --no_force_dirs inhibits forcing_technique

The "forcing_technique" trick which handles the (rare) case of files
included as e.g. <foo/../file.h> causes a performance degradation:
The forcing files accumulate over the life of the include_server, making
distcc send more and more (useless) files as the build progresses.
While the forcing files are zero-length, the transmission filenames
themselves introduce a significant overhead for builds with many files
and directories.

This patch implements the include_server arg --no_force_dirs, which if
set switches off the "forcing_technique" scheme.


git-svn-id: http://distcc.googlecode.com/svn/trunk@767 01de4be4-8c4a-0410-9132-4925637da917

1 files changed, 9 insertions, 0 deletions

diff --git a/include_server/include_server.py b/include_server/include_server.py
index b7aa0d8..886baac 100755
--- a/include_server/include_server.py
+++ b/include_server/include_server.py
@@ -116,6 +116,12 @@ OPTIONS:
                              gathering the include closure. See the
                              include_server(1) man page for futher information.
                              Using this option may lead to incorrect results.
+
+ --no_force_dirs             Do not force the creation of all directories used
+                             in an include path.  May improve peformance for
+                             some cases, but will break builds which use
+                             include structures like "<foo/../file.h>" without
+                             including other files in foo/.
                              
  -v, --verify                Verify that files in CPP closure are contained in
                              closure calculated by include processor.
@@ -482,6 +488,7 @@ def _ParseCommandLineOptions():
                                 "statistics",
                                 "time",
                                 "unsafe_absolute_includes",
+                                "no_force_dirs",
                                 "verify",
                                 "write_include_closure"])
   except getopt.GetoptError:
@@ -517,6 +524,8 @@ def _ParseCommandLineOptions():
         sys.exit("Not implemented")
       if opt in ("--unsafe_absolute_includes",):
         basics.opt_unsafe_absolute_includes = True
+      if opt in ("--no_force_dirs",):
+        basics.opt_no_force_dirs = True
       if opt in ("-s", "--statistics"):
         basics.opt_statistics = True
       if opt in ("-t", "--time"):