[PATCH] Support || and && in preprocessor's conditions.

[Przemyslaw Pawelczyk <przemyslaw@pawelczyk.it>]

---
 parse.cxx |   30 ++++++++++++++++++++++++++++--
 1 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/parse.cxx b/parse.cxx
index a26d594..a74b513 100644
--- a/parse.cxx
+++ b/parse.cxx
@@ -332,16 +332,42 @@ parser::scan_pp (bool wildcard)
 
       // Do not evaluate the condition if we haven't expanded everything.
       // This may occur when having several recursive conditionals.
-      bool result = eval_pp_conditional (session, l, op, r);
+      bool and_result = eval_pp_conditional (session, l, op, r);
       delete l;
       delete op;
       delete r;
 
+      bool result = false;
+      const token *n;
+      while ((n = input.scan ()) && n->type == tok_operator)
+        {
+          if (n->content == "||")
+            {
+              result |= and_result;
+              and_result = true;
+            }
+          else if (n->content != "&&")
+            break;
+          l = input.scan (false);
+          op = input.scan (false);
+          r = input.scan (false);
+          if (l == 0 || op == 0 || r == 0)
+            throw parse_error ("incomplete condition after '%('", t);
+
+          and_result &= eval_pp_conditional (session, l, op, r);
+          delete l;
+          delete op;
+          delete r;
+          delete n;
+        }
+
+      result |= and_result;
+
       /*
       clog << "PP eval (" << *t << ") == " << result << endl;
       */
 
-      const token *m = input.scan (); // NB: not recursive
+      const token *m = n; // NB: not recursive
       if (! (m && m->type == tok_operator && m->content == "%?"))
         throw parse_error ("expected '%?' marker for conditional", t);
       delete m; // "%?"
-- 
1.5.6.5