From b01aaa16e5adaa0cc064490535f8756b2ef8d421 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 12 Aug 2021 13:05:54 +0200
Subject: Add ${c,cxx}.deduplicate_export_libs() function

This function deduplicates interface library dependencies by removing
libraries that are also interface dependencies of the specified
libraries. This can result in significantly better build performance for
heavily interface-interdependent library families (for example, like Boost).

Typical usage:

import intf_libs = ...
import intf_libs += ...
...
import intf_libs += ...
intf_libs = $cxx.deduplicate_export_libs($intf_libs)
---
 libbuild2/cc/link-rule.hxx | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'libbuild2/cc/link-rule.hxx')

diff --git a/libbuild2/cc/link-rule.hxx b/libbuild2/cc/link-rule.hxx
index 3d801d6..0fc1790 100644
--- a/libbuild2/cc/link-rule.hxx
+++ b/libbuild2/cc/link-rule.hxx
@@ -214,6 +214,13 @@ namespace build2
       append_binless_modules (strings&, sha256*,
                               const scope&, action, const file&) const;
 
+      bool
+      deduplicate_export_libs (
+        const scope&,
+        const vector<name>&,
+        names&,
+        vector<reference_wrapper<const name>>* = nullptr) const;
+
       optional<path>
       find_system_library (const strings&) const;
 
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