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/build/script/types-parsers.cxx | 56 ++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 libbuild2/build/script/types-parsers.cxx

(limited to 'libbuild2/build/script/types-parsers.cxx')

diff --git a/libbuild2/build/script/types-parsers.cxx b/libbuild2/build/script/types-parsers.cxx
new file mode 100644
index 0000000..9ecfa13
--- /dev/null
+++ b/libbuild2/build/script/types-parsers.cxx
@@ -0,0 +1,56 @@
+// file      : libbuild2/build/script/types-parsers.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/build/script/types-parsers.hxx>
+
+#include <libbuild2/build/script/builtin-options.hxx> // cli namespace
+
+namespace build2
+{
+  namespace build
+  {
+    namespace script
+    {
+      namespace cli
+      {
+        template <typename T>
+        static void
+        parse_path (T& x, scanner& s)
+        {
+          const char* o (s.next ());
+
+          if (!s.more ())
+            throw missing_value (o);
+
+          const char* v (s.next ());
+
+          try
+          {
+            x = T (v);
+
+            if (x.empty ())
+              throw invalid_value (o, v);
+          }
+          catch (const invalid_path&)
+          {
+            throw invalid_value (o, v);
+          }
+        }
+
+        void parser<path>::
+        parse (path& x, bool& xs, scanner& s)
+        {
+          xs = true;
+          parse_path (x, s);
+        }
+
+        void parser<dir_path>::
+        parse (dir_path& x, bool& xs, scanner& s)
+        {
+          xs = true;
+          parse_path (x, s);
+        }
+      }
+    }
+  }
+}
-- 
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