From 23827edd998db30dd1f0d6a14f09399aa7d07b69 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 13 May 2021 15:38:53 +0200
Subject: Add ${c,cxx}.find_system_{header,library}() functions

---
 libbuild2/cc/compile-rule.cxx | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'libbuild2/cc/compile-rule.cxx')

diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index f8529fb..90a6024 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -175,6 +175,21 @@ namespace build2
       throw invalid_argument ("invalid preprocessed value '" + s + "'");
     }
 
+    optional<path> compile_rule::
+    find_system_header (const path& f) const
+    {
+      path p; // Reuse the buffer.
+      for (const dir_path& d: sys_inc_dirs)
+      {
+        if (file_exists ((p = d, p /= f),
+                         true /* follow_symlinks */,
+                         true /* ignore_errors */))
+          return p;
+      }
+
+      return nullopt;
+    }
+
     struct compile_rule::match_data
     {
       explicit
-- 
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