From fa9dbc56a15aec71ac2eda7890efd0116797f373 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Thu, 13 Oct 2016 00:18:26 +0200
Subject: cmGeneratorTarget: Implement cmTargetPropertyComputer interface

Populate a local member for the sources property when the instance is
created.  Pass the parameter to avoid the policy check when doing so.
Ordinarily, the GetSources function should not be called unconditionally
(at generate time), but we need to do so here in case the property is
read in a generator expression.  The intent is to be able to implement
cmGeneratorTarget without requiring cmTarget.
---
 Source/cmGeneratorTarget.cxx | 38 ++++++++++++++++++++++++++++++++++++++
 Source/cmGeneratorTarget.h   |  2 ++
 2 files changed, 40 insertions(+)

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index fb732a6..050fcb8 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -18,6 +18,7 @@
 #include "cmSystemTools.h"
 #include "cmTarget.h"
 #include "cmTargetLinkLibraryType.h"
+#include "cmTargetPropertyComputer.h"
 #include "cm_auto_ptr.hxx"
 #include "cmake.h"
 
@@ -42,6 +43,28 @@
 #define UNORDERED_SET std::set
 #endif
 
+template <>
+const char* cmTargetPropertyComputer::GetSources<cmGeneratorTarget>(
+  cmGeneratorTarget const* tgt, cmMessenger* /* messenger */,
+  cmListFileBacktrace const& /* context */)
+{
+  return tgt->GetSourcesProperty();
+}
+
+template <>
+const char* cmTargetPropertyComputer::ComputeLocationForBuild<
+  cmGeneratorTarget>(cmGeneratorTarget const* tgt)
+{
+  return tgt->GetLocation("");
+}
+
+template <>
+const char* cmTargetPropertyComputer::ComputeLocation<cmGeneratorTarget>(
+  cmGeneratorTarget const* tgt, const std::string& config)
+{
+  return tgt->GetLocation(config);
+}
+
 class cmGeneratorTarget::TargetPropertyEntry
 {
   static cmLinkImplItem NoLinkImplItem;
@@ -320,6 +343,21 @@ cmGeneratorTarget::~cmGeneratorTarget()
   cmDeleteAll(this->LinkInformation);
 }
 
+const char* cmGeneratorTarget::GetSourcesProperty() const
+{
+  std::vector<std::string> values;
+  for (std::vector<cmGeneratorTarget::TargetPropertyEntry *>::const_iterator
+         it = this->SourceEntries.begin(),
+         end = this->SourceEntries.end();
+       it != end; ++it) {
+    values.push_back((*it)->ge->GetInput());
+  }
+  static std::string value;
+  value.clear();
+  value = cmJoin(values, "");
+  return value.c_str();
+}
+
 cmGlobalGenerator* cmGeneratorTarget::GetGlobalGenerator() const
 {
   return this->GetLocalGenerator()->GetGlobalGenerator();
diff --git a/Source/cmGeneratorTarget.h b/Source/cmGeneratorTarget.h
index bfbd790..15e46b8 100644
--- a/Source/cmGeneratorTarget.h
+++ b/Source/cmGeneratorTarget.h
@@ -532,6 +532,8 @@ public:
 
   std::string GetFortranModuleDirectory(std::string const& working_dir) const;
 
+  const char* GetSourcesProperty() const;
+
 private:
   void AddSourceCommon(const std::string& src);
 
-- 
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