[gnome-code-assistance] Add global system include dir if found

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 3e250d6bed5f0aa2f56c4ef8ceed5aaa64c3dffa
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Tue Jun 24 21:48:59 2014 +0200

    Add global system include dir if found

 backends/c/service.py |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)
---
diff --git a/backends/c/service.py b/backends/c/service.py
index fb78860..9e7fde1 100644
--- a/backends/c/service.py
+++ b/backends/c/service.py
@@ -19,12 +19,14 @@ from gnome.codeassistance.c import clangimporter, makefileintegration, config
 from gnome.codeassistance import transport, types
 
 import clang.cindex as cindex
-import glob, os
+import glob, os, subprocess
 
 _did_libclang_config = False
+_global_sysinclude = None
 
 def config_libclang():
     global _did_libclang_config
+    global _global_sysinclude
 
     if _did_libclang_config:
         return
@@ -39,6 +41,13 @@ def config_libclang():
     if len(files) != 0:
         cindex.Config.set_library_file(files[0])
 
+    try:
+        _global_sysinclude = subprocess.check_output(['llvm-clang', '-print-file-name=include']).strip()
+    except:
+        pass
+
+    print(_global_sysinclude)
+
 class Service(transport.Service, transport.Project):
     language = 'c'
 
@@ -54,8 +63,15 @@ class Service(transport.Service, transport.Project):
         if (not doc.tu is None) and not self.makefile.changed_for_file(doc.path):
             doc.tu.reparse(unsaved)
         else:
+            global _global_sysinclude
+
             args = self.makefile.flags_for_file(doc.path)
 
+            if not _global_sysinclude is None:
+                args = list(args)
+                args.append('-isystem')
+                args.append(_global_sysinclude)
+
             doc.tu = cindex.TranslationUnit.from_source(doc.path,
                                                         args=args,
                                                         unsaved_files=unsaved,
@@ -112,6 +128,7 @@ class Service(transport.Service, transport.Project):
         resolved = {}
 
         for d in tu.diagnostics:
+            print(d)
             if d.location is None or d.location.file is None:
                 continue