From 3cc5e3bd441fc9d18fece3d9e99fae75c78438e7 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 28 Jun 2018 09:44:15 +0200
Subject: Implement support for excluded and ad hoc prerequisites

The inclusion/exclusion is controlled via the 'include' prerequisite-specific
variable. Valid values are:

false  - exclude
true   - include
adhoc  - include but treat as an ad hoc input

For example:

lib{foo}: cxx{win32-utility}: include = ($cxx.targe.class == 'windows')
exe{bar}: libs{plugin}: include = adhoc
---
 build2/cc/common.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'build2/cc/common.cxx')

diff --git a/build2/cc/common.cxx b/build2/cc/common.cxx
index 0778acf..3c4994e 100644
--- a/build2/cc/common.cxx
+++ b/build2/cc/common.cxx
@@ -224,7 +224,10 @@ namespace build2
       {
         for (const prerequisite_target& pt: l.prerequisite_targets[a])
         {
-          if (pt == nullptr)
+          // Note: adhoc prerequisites are not part of the library meta-
+          // information protocol.
+          //
+          if (pt == nullptr || pt.adhoc)
             continue;
 
           bool la;
-- 
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