1 files changed, 98 insertions, 10 deletions

diff --git a/Source/cmGeneratorExpression.cxx b/Source/cmGeneratorExpression.cxx
index 3fd4a5f..6d003e1 100644
--- a/Source/cmGeneratorExpression.cxx
+++ b/Source/cmGeneratorExpression.cxx
@@ -53,7 +53,22 @@ cmGeneratorExpression::~cmGeneratorExpression()
 //----------------------------------------------------------------------------
 const char *cmCompiledGeneratorExpression::Evaluate(
   cmMakefile* mf, const char* config, bool quiet,
-  cmTarget *target,
+  cmTarget *headTarget,
+  cmGeneratorExpressionDAGChecker *dagChecker) const
+{
+  return this->Evaluate(mf,
+                        config,
+                        quiet,
+                        headTarget,
+                        headTarget,
+                        dagChecker);
+}
+
+//----------------------------------------------------------------------------
+const char *cmCompiledGeneratorExpression::Evaluate(
+  cmMakefile* mf, const char* config, bool quiet,
+  cmTarget *headTarget,
+  cmTarget *currentTarget,
   cmGeneratorExpressionDAGChecker *dagChecker) const
 {
   if (!this->NeedsParsing)
@@ -73,7 +88,8 @@ const char *cmCompiledGeneratorExpression::Evaluate(
   context.Config = config;
   context.Quiet = quiet;
   context.HadError = false;
-  context.Target = target;
+  context.HeadTarget = headTarget;
+  context.CurrentTarget = currentTarget ? currentTarget : headTarget;
   context.Backtrace = this->Backtrace;
 
   for ( ; it != end; ++it)
@@ -123,15 +139,9 @@ cmCompiledGeneratorExpression::~cmCompiledGeneratorExpression()
     }
 }
 
-std::string cmGeneratorExpression::Preprocess(const std::string &input,
-                                              PreprocessContext context)
+//----------------------------------------------------------------------------
+static std::string stripAllGeneratorExpressions(const std::string &input)
 {
-  if (context != StripAllGeneratorExpressions)
-  {
-    assert(!"cmGeneratorExpression::Preprocess called with invalid args");
-    return std::string();
-  }
-
   std::string result;
   std::string::size_type pos = 0;
   std::string::size_type lastPos = pos;
@@ -170,3 +180,81 @@ std::string cmGeneratorExpression::Preprocess(const std::string &input,
   result += input.substr(lastPos);
   return result;
 }
+
+//----------------------------------------------------------------------------
+static std::string stripExportInterface(const std::string &input,
+                          cmGeneratorExpression::PreprocessContext context)
+{
+  std::string result;
+
+  std::string::size_type pos = 0;
+  std::string::size_type lastPos = pos;
+  while((pos = input.find("$<BUILD_INTERFACE:", lastPos)) != input.npos
+    || (pos = input.find("$<INSTALL_INTERFACE:", lastPos)) != input.npos)
+    {
+    result += input.substr(lastPos, pos - lastPos);
+    const bool gotInstallInterface = input[pos + 2] == 'I';
+    pos += gotInstallInterface ? sizeof("$<INSTALL_INTERFACE:") - 1
+                               : sizeof("$<BUILD_INTERFACE:") - 1;
+    int nestingLevel = 1;
+    const char *c = input.c_str() + pos;
+    const char * const cStart = c;
+    for ( ; *c; ++c)
+      {
+      if(c[0] == '$' && c[1] == '<')
+        {
+        ++nestingLevel;
+        ++c;
+        continue;
+        }
+      if(c[0] == '>')
+        {
+        --nestingLevel;
+        if (nestingLevel != 0)
+          {
+          continue;
+          }
+        if(context == cmGeneratorExpression::BuildInterface
+            && !gotInstallInterface)
+          {
+          result += input.substr(pos, c - cStart);
+          }
+        else if(context == cmGeneratorExpression::InstallInterface
+            && gotInstallInterface)
+          {
+          result += input.substr(pos, c - cStart);
+          }
+        break;
+        }
+      }
+    const std::string::size_type traversed = (c - cStart) + 1;
+    if (!*c)
+      {
+      result += std::string(gotInstallInterface ? "$<INSTALL_INTERFACE:"
+                                                : "$<BUILD_INTERFACE:")
+             + input.substr(pos, traversed);
+      }
+    pos += traversed;
+    lastPos = pos;
+    }
+  result += input.substr(lastPos);
+
+  return result;
+}
+
+//----------------------------------------------------------------------------
+std::string cmGeneratorExpression::Preprocess(const std::string &input,
+                                              PreprocessContext context)
+{
+  if (context == StripAllGeneratorExpressions)
+    {
+    return stripAllGeneratorExpressions(input);
+    }
+  else if (context == BuildInterface || context == InstallInterface)
+    {
+    return stripExportInterface(input, context);
+    }
+
+  assert(!"cmGeneratorExpression::Preprocess called with invalid args");
+  return std::string();
+}