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/adhoc-rule-buildscript.hxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'libbuild2/adhoc-rule-buildscript.hxx')

diff --git a/libbuild2/adhoc-rule-buildscript.hxx b/libbuild2/adhoc-rule-buildscript.hxx
index 7f9c10a..51d37d4 100644
--- a/libbuild2/adhoc-rule-buildscript.hxx
+++ b/libbuild2/adhoc-rule-buildscript.hxx
@@ -38,6 +38,18 @@ namespace build2
     target_state
     perform_update_file (action, const target&) const;
 
+    struct match_data;
+
+    target_state
+    perform_update_file_dyndep (action, const target&, match_data&) const;
+
+    bool
+    execute_update_file (const scope&,
+                         action a, const file&,
+                         build::script::environment&,
+                         build::script::default_runner&,
+                         bool deferred_failure = false) const;
+
     target_state
     default_action (action, const target&, const optional<timestamp>&) const;
 
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