From af73b1603d851dcb2ce7ae84bd57df0c2f9a716d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 16 Jun 2020 09:43:59 +0200
Subject: Add $bin.link_member() function

Given a linker output target type ("exe", "lib[as]", or "libu[eas]") return
the target type of lib{} group member ("liba" or "libs") that will be picked
when linking a lib{} group to this target type.
---
 libbuild2/bin/functions.cxx | 68 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 libbuild2/bin/functions.cxx

(limited to 'libbuild2/bin/functions.cxx')

diff --git a/libbuild2/bin/functions.cxx b/libbuild2/bin/functions.cxx
new file mode 100644
index 0000000..59fcdf2
--- /dev/null
+++ b/libbuild2/bin/functions.cxx
@@ -0,0 +1,68 @@
+// file      : libbuild2/bin/functions.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
+
+#include <libbuild2/bin/utility.hxx>
+
+namespace build2
+{
+  namespace bin
+  {
+    void
+    functions (function_map& m)
+    {
+      function_family f (m, "bin");
+
+      // Given a linker output target type ("exe", "lib[as]", or "libu[eas]")
+      // and a lib{} target group, return the type of library member ("liba"
+      // or "libs") that will be picked when linking this library group to
+      // this target type.
+      //
+      // The lib{} target is only used to resolve the scope to lookup the
+      // bin.lib value on. As a result, it can be omitted in which case the
+      // function call scope is used (covers project-local lib{} targets).
+      //
+      // @@ TODO: support for target (note that if it's out of project, then
+      //          it's imported, which means it might still be qualified.)
+      //
+      // @@ TODO: support utility libraries (see link_member()).
+      //
+      f[".link_member"] = [] (const scope* bs, names ns)
+      {
+        string t (convert<string> (move (ns)));
+
+        if (bs == nullptr)
+          fail << "bin.link_member() called out of scope";
+
+        const scope* rs (bs->root_scope ());
+
+        if (rs == nullptr)
+          fail << "bin.link_member() called out of root scope";
+
+        const target_type* tt (bs->find_target_type (t));
+
+        if (tt == nullptr)
+          fail << "unknown target type '" << t << "'";
+
+        otype ot (link_type (*tt).type);
+
+        switch (ot)
+        {
+        case otype::e:
+        case otype::a:
+        case otype::s:
+          break;
+        default:
+          fail << "target type " << t << " is not linker output";
+        }
+
+        lorder lo (link_order (*bs, ot));
+        lmembers lm (link_members (*rs));
+
+        return link_member (lm, lo).first == otype::s ? "libs" : "liba";
+      };
+    }
+  }
+}
-- 
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