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authorBoris Kolpackov <boris@codesynthesis.com>2019-07-08 14:55:35 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2019-07-24 13:53:25 +0200
commit83bb02cada0b894d9134cc5489999e0f0fe8bd7c (patch)
tree1dedff27ce2b7d54bd6b0875c9125f4dafde2e80 /libbuild2/in/target.hxx
parent1ba934bb973c234b68751ee5866365c14da4e795 (diff)
Move in build system module to separate library
Diffstat (limited to 'libbuild2/in/target.hxx')
-rw-r--r--libbuild2/in/target.hxx48
1 files changed, 48 insertions, 0 deletions
diff --git a/libbuild2/in/target.hxx b/libbuild2/in/target.hxx
new file mode 100644
index 0000000..5e3438d
--- /dev/null
+++ b/libbuild2/in/target.hxx
@@ -0,0 +1,48 @@
+// file : libbuild2/in/target.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_IN_TARGET_HXX
+#define LIBBUILD2_IN_TARGET_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/target.hxx>
+
+#include <libbuild2/in/export.hxx>
+
+namespace build2
+{
+ namespace in
+ {
+ // This is the venerable .in ("input") file that needs some kind of
+ // preprocessing.
+ //
+ // One interesting aspect of this target type is that the prerequisite
+ // search is target-dependent. Consider:
+ //
+ // hxx{version}: in{version.hxx} // version.hxx.in -> version.hxx
+ //
+ // Having to specify the header extension explicitly is inelegant. Instead
+ // what we really want to write is this:
+ //
+ // hxx{version}: in{version}
+ //
+ // But how do we know that in{version} means version.hxx.in? That's where
+ // the target-dependent search comes in: we take into account the target
+ // we are a prerequisite of.
+ //
+ class LIBBUILD2_IN_SYMEXPORT in: public file
+ {
+ public:
+ using file::file;
+
+ public:
+ static const target_type static_type;
+ virtual const target_type& dynamic_type () const {return static_type;}
+ };
+ }
+}
+
+#endif // LIBBUILD2_IN_TARGET_HXX