From db8336a686a85f0e458acb2d5f1ad442585bfc9a Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 1 Oct 2021 11:05:49 +0200
Subject: Add notion of internal scope, translate external -I to -isystem or
 equivalent

---
 libbuild2/utility.hxx | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'libbuild2/utility.hxx')

diff --git a/libbuild2/utility.hxx b/libbuild2/utility.hxx
index f9f1daa..b62d2ab 100644
--- a/libbuild2/utility.hxx
+++ b/libbuild2/utility.hxx
@@ -650,6 +650,26 @@ namespace build2
                         I begin, I end,
                         F&& get = [] (const string& s) {return s;});
 
+  // As above but append a single option (used for append/hash uniformity).
+  //
+  inline void
+  append_option (cstrings& args, const char* o)
+  {
+    args.push_back (o);
+  }
+
+  inline void
+  append_option (strings& args, const char* o)
+  {
+    args.push_back (o);
+  }
+
+  inline void
+  append_option (sha256& csum, const char* o)
+  {
+    csum.append (o);
+  }
+
   // Check if a specified option is present in the variable or value. T is
   // either target or scope. For the interator version use rbegin()/rend() to
   // search backwards.
-- 
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