From 939beb11a5ccf58d7fe79a809a1b592c5c9143c0 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 11 Nov 2021 13:20:30 +0200
Subject: Add support for dynamic dependencies in ad hoc Buildscript recipes

Specifically, add the new `depdb dyndep` builtin that can be used to extract
dynamic dependencies from a program run or a file. For example:

obje{hello.o}: cxx{hello}
{{
  s = $path($<[0])

  depdb dyndep $cxx.poptions $cc.poptions --what=header --default-prereq-type=h -- $cxx.path $cxx.poptions $cc.poptions $cxx.mode -M -MG $s

  diag c++ ($<[0])

  o = $path($>)
  $cxx.path $cxx.poptions $cc.poptions $cc.coptions $cxx.coptions $cxx.mode -o $o -c $s
}}

Currently only the `make` dependency format is supported.
---
 libbuild2/script/script.hxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'libbuild2/script/script.hxx')

diff --git a/libbuild2/script/script.hxx b/libbuild2/script/script.hxx
index d162900..81bc13c 100644
--- a/libbuild2/script/script.hxx
+++ b/libbuild2/script/script.hxx
@@ -495,7 +495,8 @@ namespace build2
 
       // Register a cleanup. If the cleanup is explicit, then override the
       // cleanup type if this path is already registered. Ignore implicit
-      // registration of a path outside root directory (see below).
+      // registration of a path outside sandbox directory, if specified (see
+      // above).
       //
       void
       clean (cleanup, bool implicit);
-- 
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