cmRulePlaceholderExpander: expand `<TARGET_SUPPORT_DIR>` placeholders

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 9ad7f08..78dcda5 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx

@@ -2358,6 +2358,7 @@
     vars.Object = sfVars.ObjectFileDir.c_str();
     vars.ObjectDir = sfVars.ObjectDir.c_str();
     vars.ObjectFileDir = sfVars.ObjectFileDir.c_str();
+    vars.TargetSupportDir = sfVars.TargetSupportDir.c_str();
     vars.Flags = PlaceholderFlags.c_str();
     vars.DependencyFile = sfVars.DependencyFile.c_str();
     vars.DependencyTarget = sfVars.DependencyTarget.c_str();
@@ -2438,12 +2439,16 @@
 
   // Object settings.
   {
+    std::string const targetSupportDir = lg->MaybeRelativeToTopBinDir(
+      gg->ConvertToOutputPath(this->GetCMFSupportDirectory()));
     std::string const objectDir = gg->ConvertToOutputPath(
       cmStrCat(this->GetSupportDirectory(), gg->GetConfigDirectory(config)));
     std::string const objectFileName = this->GetObjectName(sf);
     std::string const objectFilePath =
       cmStrCat(objectDir, '/', objectFileName);
 
+    vars.TargetSupportDir =
+      lg->ConvertToOutputFormat(targetSupportDir, cmOutputConverter::SHELL);
     vars.ObjectDir =
       lg->ConvertToOutputFormat(objectDir, cmOutputConverter::SHELL);
     vars.ObjectFileDir =

diff --git a/Source/cmGeneratorTarget.h b/Source/cmGeneratorTarget.h
index 34b66f7..6e9f92f 100644
--- a/Source/cmGeneratorTarget.h
+++ b/Source/cmGeneratorTarget.h

@@ -566,6 +566,7 @@
     std::string TargetPDB;
     std::string TargetCompilePDB;
     std::string ObjectDir;
+    std::string TargetSupportDir;
     std::string ObjectFileDir;
     std::string DependencyFile;
     std::string DependencyTarget;

diff --git a/Source/cmRulePlaceholderExpander.cxx b/Source/cmRulePlaceholderExpander.cxx
index 01b6a66..4892b7c 100644
--- a/Source/cmRulePlaceholderExpander.cxx
+++ b/Source/cmRulePlaceholderExpander.cxx

@@ -77,6 +77,11 @@
       return this->ReplaceValues->Object;
     }
   }
+  if (this->ReplaceValues->TargetSupportDir) {
+    if (variable == "TARGET_SUPPORT_DIR") {
+      return this->ReplaceValues->TargetSupportDir;
+    }
+  }
   if (this->ReplaceValues->ObjectDir) {
     if (variable == "OBJECT_DIR") {
       return this->ReplaceValues->ObjectDir;

diff --git a/Source/cmRulePlaceholderExpander.h b/Source/cmRulePlaceholderExpander.h
index 598a8ed..d0c3687 100644
--- a/Source/cmRulePlaceholderExpander.h
+++ b/Source/cmRulePlaceholderExpander.h

@@ -48,6 +48,7 @@
     char const* DynDepFile = nullptr;
     char const* Output = nullptr;
     char const* Object = nullptr;
+    char const* TargetSupportDir = nullptr;
     char const* ObjectDir = nullptr;
     char const* ObjectFileDir = nullptr;
     char const* Flags = nullptr;