From 56cc47e7e5dd3aa15e1023db5525bdc6a5486c1f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 15 Jan 2024 11:12:14 +0200
Subject: Add no_default_target attribute for source, buildfile import
 directives

This attribute can be used to disable the default target semantics for the
sources/imported buildfile.
---
 libbuild2/parser.hxx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'libbuild2/parser.hxx')

diff --git a/libbuild2/parser.hxx b/libbuild2/parser.hxx
index 7263e59..b756984 100644
--- a/libbuild2/parser.hxx
+++ b/libbuild2/parser.hxx
@@ -388,11 +388,17 @@ namespace build2
     // processing. If the specified path name has a real path, then also enter
     // it as a buildfile.
     //
+    // If default_target is nullopt, then disable the default target semantics
+    // as when loading boostrap.build or root.build. If it is false, then
+    // continue with the existing default_target value. If it is true, then
+    // start with a new default_value and call process_default_target() at
+    // the end.
+    //
     void
     source_buildfile (istream&,
                       const path_name&,
                       const location&,
-                      bool default_target);
+                      optional<bool> default_target);
 
     // The what argument is used in diagnostics (e.g., "expected <what>
     // instead of ...".
-- 
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