genex: remove the need for backtraces

Rather than making dummy backtraces and passing them around, just make
backtraces optional.

1 files changed, 5 insertions, 8 deletions

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 153c611..a7576ed 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -259,12 +259,10 @@ static void handleSystemIncludesDep(cmMakefile *mf, cmTarget* depTgt,
                                   std::vector<std::string>& result,
                                   bool excludeImported)
 {
-  cmListFileBacktrace lfbt;
-
   if (const char* dirs =
           depTgt->GetProperty("INTERFACE_SYSTEM_INCLUDE_DIRECTORIES"))
     {
-    cmGeneratorExpression ge(lfbt);
+    cmGeneratorExpression ge;
     cmSystemTools::ExpandListArgument(ge.Parse(dirs)
                                       ->Evaluate(mf,
                                       config, false, headTarget,
@@ -278,7 +276,7 @@ static void handleSystemIncludesDep(cmMakefile *mf, cmTarget* depTgt,
   if (const char* dirs =
                 depTgt->GetProperty("INTERFACE_INCLUDE_DIRECTORIES"))
     {
-    cmGeneratorExpression ge(lfbt);
+    cmGeneratorExpression ge;
     cmSystemTools::ExpandListArgument(ge.Parse(dirs)
                                       ->Evaluate(mf,
                                       config, false, headTarget,
@@ -457,8 +455,7 @@ bool cmGeneratorTarget::IsSystemIncludeDirectory(const std::string& dir,
       return false;
       }
 
-    cmListFileBacktrace lfbt;
-    cmGeneratorExpressionDAGChecker dagChecker(lfbt,
+    cmGeneratorExpressionDAGChecker dagChecker(
                                         this->GetName(),
                                         "SYSTEM_INCLUDE_DIRECTORIES", 0, 0);
 
@@ -470,7 +467,7 @@ bool cmGeneratorTarget::IsSystemIncludeDirectory(const std::string& dir,
         it = this->Target->GetSystemIncludeDirectories().begin();
         it != this->Target->GetSystemIncludeDirectories().end(); ++it)
       {
-      cmGeneratorExpression ge(lfbt);
+      cmGeneratorExpression ge;
       cmSystemTools::ExpandListArgument(ge.Parse(*it)
                                           ->Evaluate(this->Makefile,
                                           config, false, this->Target,
@@ -808,7 +805,7 @@ cmTargetTraceDependencies
 {
   // Transform command names that reference targets built in this
   // project to corresponding target-level dependencies.
-  cmGeneratorExpression ge(cc.GetBacktrace());
+  cmGeneratorExpression ge(&cc.GetBacktrace());
 
   // Add target-level dependencies referenced by generator expressions.
   std::set<cmTarget*> targets;