From a3aedb8152ad6fcdb42fd04e45307eea6ce0043e Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Fri, 4 Jan 2013 15:56:13 +0100
Subject: Split the generator expression before extracting targets.

Now that we're processing a LINK_INTERFACE_LIBRARIES string, it
can contain targets. Make sure they are extracted for
namespacing purposes.

This needs to be restricted to strings which can actually have
targets named in them. For example, this is not done for
INTERFACE_COMPILE_DEFINITIONS, because even if there is a target
named 'foo', the string 'foo' in that property means that '-Dfoo'
will be set when compiling.
---
 Source/cmExportFileGenerator.cxx | 45 ++++++++++++++++++++++++++++++++++++++++
 Source/cmExportFileGenerator.h   | 14 +++++++++++--
 2 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index da18856..df8f3e8 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -219,10 +219,55 @@ cmExportFileGenerator::AddTargetNamespace(std::string &input,
 }
 
 //----------------------------------------------------------------------------
+static bool isGeneratorExpression(const std::string &lib)
+{
+  const std::string::size_type openpos = lib.find("$<");
+  return (openpos != std::string::npos)
+      && (lib.find(">", openpos) != std::string::npos);
+}
+
+//----------------------------------------------------------------------------
 void
 cmExportFileGenerator::ResolveTargetsInGeneratorExpressions(
                                     std::string &input,
                                     cmTarget* target,
+                                    std::vector<std::string> &missingTargets,
+                                    FreeTargetsReplace replace)
+{
+  if (replace == NoReplaceFreeTargets)
+    {
+    this->ResolveTargetsInGeneratorExpression(input, target, missingTargets);
+    return;
+    }
+  std::vector<std::string> parts;
+  cmGeneratorExpression::Split(input, parts);
+
+  std::string sep;
+  input = "";
+  for(std::vector<std::string>::iterator li = parts.begin();
+      li != parts.end(); ++li)
+    {
+    if (!isGeneratorExpression(*li))
+      {
+      this->AddTargetNamespace(*li, target, missingTargets);
+      }
+    else
+      {
+      this->ResolveTargetsInGeneratorExpression(
+                                    *li,
+                                    target,
+                                    missingTargets);
+      }
+    input += sep + *li;
+    sep = ";";
+    }
+}
+
+//----------------------------------------------------------------------------
+void
+cmExportFileGenerator::ResolveTargetsInGeneratorExpression(
+                                    std::string &input,
+                                    cmTarget* target,
                                     std::vector<std::string> &missingTargets)
 {
   std::string::size_type pos = 0;
diff --git a/Source/cmExportFileGenerator.h b/Source/cmExportFileGenerator.h
index a5b25f4..866806b 100644
--- a/Source/cmExportFileGenerator.h
+++ b/Source/cmExportFileGenerator.h
@@ -102,9 +102,16 @@ protected:
   void GenerateInterfaceProperties(cmTarget *target, std::ostream& os,
                                    const ImportPropertyMap &properties);
 
+
+  enum FreeTargetsReplace {
+    ReplaceFreeTargets,
+    NoReplaceFreeTargets
+  };
+
   void ResolveTargetsInGeneratorExpressions(std::string &input,
-                                    cmTarget* target,
-                                    std::vector<std::string> &missingTargets);
+                          cmTarget* target,
+                          std::vector<std::string> &missingTargets,
+                          FreeTargetsReplace replace = NoReplaceFreeTargets);
 
   // The namespace in which the exports are placed in the generated file.
   std::string Namespace;
@@ -132,6 +139,9 @@ private:
   bool AddTargetNamespace(std::string &input, cmTarget* target,
                           std::vector<std::string> &missingTargets);
 
+  void ResolveTargetsInGeneratorExpression(std::string &input,
+                                    cmTarget* target,
+                                    std::vector<std::string> &missingTargets);
 };
 
 #endif
-- 
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