From a59639b60853edd89574a884b6f2d95c64a35c5d Mon Sep 17 00:00:00 2001
From: Vladimir Prus <ghost@cs.msu.su>
Date: Sat, 22 Aug 2009 08:21:07 +0000
Subject: [PATCH] Fix viable-source-types-for-generator-real looping thinko.

The loop over 'source-types' was meant to terminate if we ever get
'*'. However, it was for loop, and assinging empty list to
source-types had no effect. As result, the function would
sometimes return a list containing '*' and other types, which
other code did not expect and mishandled.


[SVN r55712]
---
 src/build/generators.jam | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/build/generators.jam b/src/build/generators.jam
index 1b7a269bb..1515525f2 100644
--- a/src/build/generators.jam
+++ b/src/build/generators.jam
@@ -952,8 +952,10 @@ rule viable-source-types-for-generator-real ( generator )
     else
     {
         local result ;
-        for local s in $(source-types)
+        while $(source-types)
         {
+            local s = $(source-types[1]) ;
+            source-types = $(source-types[2-]) ;
             local viable-sources = [ generators.viable-source-types $(s) ] ;
             if $(viable-sources) = *
             {