From ecfae2da0b23631cee3e723a562f64f8aace6879 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 16 Jun 2020 09:43:27 +0200
Subject: Move common functionality from cc to bin

---
 libbuild2/bin/utility.cxx | 134 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 libbuild2/bin/utility.cxx

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

diff --git a/libbuild2/bin/utility.cxx b/libbuild2/bin/utility.cxx
new file mode 100644
index 0000000..8032b79
--- /dev/null
+++ b/libbuild2/bin/utility.cxx
@@ -0,0 +1,134 @@
+// file      : libbuild2/bin/utility.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/bin/utility.hxx>
+
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx> // search()
+
+namespace build2
+{
+  namespace bin
+  {
+    lorder
+    link_order (const scope& bs, otype ot)
+    {
+      // Initialize to suppress 'may be used uninitialized' warning produced
+      // by MinGW GCC 5.4.0.
+      //
+      const char* var (nullptr);
+
+      switch (ot)
+      {
+      case otype::e: var = "bin.exe.lib";  break;
+      case otype::a: var = "bin.liba.lib"; break;
+      case otype::s: var = "bin.libs.lib"; break;
+      }
+
+      const auto& v (cast<strings> (bs[var]));
+      return v[0] == "shared"
+        ? v.size () > 1 && v[1] == "static" ? lorder::s_a : lorder::s
+        : v.size () > 1 && v[1] == "shared" ? lorder::a_s : lorder::a;
+    }
+
+    lmembers
+    link_members (const scope& rs)
+    {
+      const string& type (cast<string> (rs["bin.lib"]));
+
+      bool a (type == "static" || type == "both");
+      bool s (type == "shared" || type == "both");
+
+      if (!a && !s)
+        fail << "unknown library type: " << type <<
+          info << "'static', 'shared', or 'both' expected";
+
+      return lmembers {a, s};
+    }
+
+    const target*
+    link_member (const libx& x, action a, linfo li, bool exist)
+    {
+      if (x.is_a<libul> ())
+      {
+        // For libul{} that is linked to an executable the member choice
+        // should be dictated by the members of lib{} this libul{} is
+        // "primarily" for. If both are being built, then it seems natural to
+        // prefer static over shared since it could be faster (but I am sure
+        // someone will probably want this configurable).
+        //
+        if (li.type == otype::e)
+        {
+          // Utility libraries are project-local which means the primarily
+          // target should be in the same project as us.
+          //
+          li.type = link_members (x.root_scope ()).a ? otype::a : otype::s;
+        }
+
+        const target_type& tt (li.type == otype::a
+                               ? libua::static_type
+                               : libus::static_type);
+
+        // Called by the compile rule during execute.
+        //
+        return x.ctx.phase == run_phase::match && !exist
+          ? &search (x, tt, x.dir, x.out, x.name)
+          : search_existing (x.ctx, tt, x.dir, x.out, x.name);
+      }
+      else
+      {
+        assert (!exist);
+
+        const lib& l (x.as<lib> ());
+
+        // Make sure group members are resolved.
+        //
+        group_view gv (resolve_members (a, l));
+        assert (gv.members != nullptr);
+
+        lorder lo (li.order);
+
+        bool ls (true);
+        switch (lo)
+        {
+        case lorder::a:
+        case lorder::a_s:
+          ls = false; // Fall through.
+        case lorder::s:
+        case lorder::s_a:
+          {
+            if (ls ? l.s == nullptr : l.a == nullptr)
+            {
+              if (lo == lorder::a_s || lo == lorder::s_a)
+                ls = !ls;
+              else
+                fail << (ls ? "shared" : "static") << " variant of " << l
+                     << " is not available";
+            }
+          }
+        }
+
+        return ls ? static_cast<const target*> (l.s) : l.a;
+      }
+    }
+
+    pattern_paths
+    lookup_pattern (const scope& rs)
+    {
+      pattern_paths r;
+
+      // Theoretically, we could have both the pattern and the search paths,
+      // for example, the pattern can come first followed by the paths.
+      //
+      if (const string* v = cast_null<string> (rs["bin.pattern"]))
+      {
+        (path::traits_type::is_separator (v->back ())
+         ? r.paths
+         : r.pattern) = v->c_str ();
+      }
+
+      return r;
+    }
+  }
+}
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