target_link_libraries: Add PUBLIC/PRIVATE/INTERFACE keyword signature

Add a new signature to help populate INTERFACE_LINK_LIBRARIES and
LINK_LIBRARIES cleanly in a single call.  Add policy CMP0023 to control
whether the keyword signatures can be mixed with uses of the plain
signatures on the same target.

1 files changed, 51 insertions, 0 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 26bf9b7..0b3b785 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -2494,6 +2494,57 @@ static std::string targetNameGenex(const char *lib)
 }
 
 //----------------------------------------------------------------------------
+bool cmTarget::PushTLLCommandTrace(TLLSignature signature)
+{
+  bool ret = true;
+  if (!this->TLLCommands.empty())
+    {
+    if (this->TLLCommands.back().first != signature)
+      {
+      ret = false;
+      }
+    }
+  cmListFileBacktrace lfbt;
+  this->Makefile->GetBacktrace(lfbt);
+  this->TLLCommands.push_back(std::make_pair(signature, lfbt));
+  return ret;
+}
+
+//----------------------------------------------------------------------------
+void cmTarget::GetTllSignatureTraces(cmOStringStream &s,
+                                     TLLSignature sig) const
+{
+  std::vector<cmListFileBacktrace> sigs;
+  typedef std::vector<std::pair<TLLSignature, cmListFileBacktrace> > Container;
+  for(Container::const_iterator it = this->TLLCommands.begin();
+      it != this->TLLCommands.end(); ++it)
+    {
+    if (it->first == sig)
+      {
+      sigs.push_back(it->second);
+      }
+    }
+  if (!sigs.empty())
+    {
+    const char *sigString
+                        = (sig == cmTarget::KeywordTLLSignature ? "keyword"
+                                                                : "plain");
+    s << "The uses of the " << sigString << " signature are here:\n";
+    for(std::vector<cmListFileBacktrace>::const_iterator it = sigs.begin();
+        it != sigs.end(); ++it)
+      {
+      cmListFileBacktrace::const_iterator i = it->begin();
+      if(i != it->end())
+        {
+        cmListFileContext const& lfc = *i;
+        s << " * " << (lfc.Line? "": " in ") << lfc << std::endl;
+        ++i;
+        }
+      }
+    }
+}
+
+//----------------------------------------------------------------------------
 void cmTarget::AddLinkLibrary(cmMakefile& mf,
                               const char *target, const char* lib,
                               LinkLibraryType llt)