From e022e2d8734ffbc0378b75d85b32a2524302dd50 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 10 Oct 2018 08:56:36 -0400
Subject: cmListFileCache: Add ExpandListWithBacktrace helper

---
 Source/cmListFileCache.cxx | 13 +++++++++++++
 Source/cmListFileCache.h   |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/Source/cmListFileCache.cxx b/Source/cmListFileCache.cxx
index d79afc6..d0495f7 100644
--- a/Source/cmListFileCache.cxx
+++ b/Source/cmListFileCache.cxx
@@ -479,3 +479,16 @@ std::ostream& operator<<(std::ostream& os, BT<std::string> const& s)
 {
   return os << s.Value;
 }
+
+std::vector<BT<std::string>> ExpandListWithBacktrace(
+  const char* list, cmListFileBacktrace const& bt)
+{
+  std::vector<BT<std::string>> result;
+  std::vector<std::string> tmp;
+  cmSystemTools::ExpandListArgument(list, tmp);
+  result.reserve(tmp.size());
+  for (std::string& i : tmp) {
+    result.emplace_back(std::move(i), bt);
+  }
+  return result;
+}
diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index 9f16b16..7c2802e 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -198,6 +198,9 @@ public:
 
 std::ostream& operator<<(std::ostream& os, BT<std::string> const& s);
 
+std::vector<BT<std::string>> ExpandListWithBacktrace(
+  const char* list, cmListFileBacktrace const& bt = cmListFileBacktrace());
+
 struct cmListFile
 {
   bool ParseFile(const char* path, cmMessenger* messenger,
-- 
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