From f189e03a083df9538ef914943b2cf552ee663bbb Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 29 Oct 2019 09:35:46 +0200
Subject: Add support for specifying custom load prefix and version clean
 patterns

---
 libbuild2/bin/init.cxx     | 19 ++++++++++++++-----
 libbuild2/cc/link-rule.cxx | 15 ++++++++++-----
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/libbuild2/bin/init.cxx b/libbuild2/bin/init.cxx
index db9db0e..68b5fb4 100644
--- a/libbuild2/bin/init.cxx
+++ b/libbuild2/bin/init.cxx
@@ -59,6 +59,9 @@ namespace build2
       //
       auto& vp (rs.ctx.var_pool.rw (rs));
 
+      const auto vis_tgt (variable_visibility::target);
+      const auto vis_prj (variable_visibility::project);
+
       vp.insert<string>    ("config.bin.target",   true);
       vp.insert<string>    ("config.bin.pattern",  true);
 
@@ -117,18 +120,24 @@ namespace build2
       //
       // If unspecified, defaults to false for liba{} and to true for libu*{}.
       //
-      vp.insert<bool>      ("bin.whole", false, variable_visibility::target);
+      vp.insert<bool>      ("bin.whole", false, vis_tgt);
 
       vp.insert<string>    ("bin.exe.prefix");
       vp.insert<string>    ("bin.exe.suffix");
       vp.insert<string>    ("bin.lib.prefix");
       vp.insert<string>    ("bin.lib.suffix");
 
-      vp.insert<string>    ("bin.lib.load_suffix",
-                            variable_visibility::project);
+      // The optional custom clean patterns should be just the pattern stem,
+      // without the library prefix/name or extension. For example, `-[A-Z]`
+      // instead of `libfoo-[A-Z].so`. Note that the custom version pattern is
+      // only used for platform-independent versions (for platforms-specific
+      // versions we can always derive the pattern automatically).
+      //
+      vp.insert<string> ("bin.lib.load_suffix", vis_prj);
+      vp.insert<string> ("bin.lib.load_suffix_pattern", vis_prj);
 
-      vp.insert<map<string, string>> ("bin.lib.version",
-                                      variable_visibility::project);
+      vp.insert<map<string, string>> ("bin.lib.version", vis_prj);
+      vp.insert<string>              ("bin.lib.version_pattern", vis_prj);
 
       return true;
     }
diff --git a/libbuild2/cc/link-rule.cxx b/libbuild2/cc/link-rule.cxx
index a9f798a..8a3b493 100644
--- a/libbuild2/cc/link-rule.cxx
+++ b/libbuild2/cc/link-rule.cxx
@@ -458,7 +458,9 @@ namespace build2
         // a base for the version clean pattern.
         //
         cp_l = b;
-        if (append_sep (cp_l, ls))
+        if (auto* p = cast_null<string> (t["bin.lib.load_suffix_pattern"]))
+          cp_l += *p;
+        else if (append_sep (cp_l, ls))
           cp_l += "[0-9]*";
         else
           cp_l.clear (); // Non-digit load suffix (use custom clean pattern).
@@ -485,14 +487,17 @@ namespace build2
           // we have the load clean pattern, `foo-[0-9]*-[0-9]*.dll`).
           //
           cp_v = cp_l.empty () ? b : cp_l;
-          if (append_sep (cp_v, ver))
-          {
+
+          if (auto* p = cast_null<string> (t["bin.lib.version_pattern"]))
+            cp_v += *p;
+          else if (append_sep (cp_v, ver))
             cp_v += "[0-9]*";
-            append_ext (cp_v);
-          }
           else
             cp_v.clear (); // Non-digit version (use custom clean pattern).
 
+          if (!cp_v.empty ())
+            append_ext (cp_v);
+
           b += ver;
         }
 
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