diff --git a/Source/CPack/cmCPackDebGenerator.cxx b/Source/CPack/cmCPackDebGenerator.cxx
index 635de490acce1998020ed637d7ec7f491a4b3ddf..cfb5efd0ea3f65e785d88efe21139ff83520f683 100644
--- a/Source/CPack/cmCPackDebGenerator.cxx
+++ b/Source/CPack/cmCPackDebGenerator.cxx
@@ -195,7 +195,7 @@ bool DebGenerator::generateDataTar() const
       // XXX/application/usr/bin/myprogram with GEN_WDIR=XXX/application
       // should not add XXX/application
       orderedFiles.insert(currentPath);
-      currentPath = cmSystemTools::CollapseCombinedPath(currentPath, "..");
+      currentPath = cmSystemTools::CollapseFullPath("..", currentPath);
     }
   }
 
diff --git a/Source/CPack/cmCPackFreeBSDGenerator.cxx b/Source/CPack/cmCPackFreeBSDGenerator.cxx
index fcf8af1f8d2da98d20ea5d10a2acf5ca9666f3cc..dd8127d897a546811c602b060003fda77482293d 100644
--- a/Source/CPack/cmCPackFreeBSDGenerator.cxx
+++ b/Source/CPack/cmCPackFreeBSDGenerator.cxx
@@ -325,8 +325,7 @@ int cmCPackFreeBSDGenerator::PackageFiles()
                              ONE_PACKAGE_PER_COMPONENT);
   }
 
-  std::string output_dir =
-    cmSystemTools::CollapseCombinedPath(toplevel, "../");
+  std::string output_dir = cmSystemTools::CollapseFullPath("../", toplevel);
   pkg_create_from_manifest(output_dir.c_str(), ::TXZ, toplevel.c_str(),
                            manifestname.c_str(), nullptr);
 
diff --git a/Source/cmDependsC.cxx b/Source/cmDependsC.cxx
index 58b4ebb16abe987519bfdbe3151650e005da7f71..7b78767f2861dc2f4f9d5cbf773bf2145a0ac7ae 100644
--- a/Source/cmDependsC.cxx
+++ b/Source/cmDependsC.cxx
@@ -150,7 +150,7 @@ bool cmDependsC::WriteDependencies(const std::set<std::string>& sources,
             // Construct the name of the file as if it were in the current
             // include directory.  Avoid using a leading "./".
             std::string tmpPath =
-              cmSystemTools::CollapseCombinedPath(iPath, current.FileName);
+              cmSystemTools::CollapseFullPath(current.FileName, iPath);
 
             // Look for the file in this location.
             if (cmSystemTools::FileExists(tmpPath, true)) {
@@ -362,7 +362,7 @@ void cmDependsC::Scan(std::istream& is, const std::string& directory,
         // must check for the file in the directory containing the
         // file we are scanning.
         entry.QuotedLocation =
-          cmSystemTools::CollapseCombinedPath(directory, entry.FileName);
+          cmSystemTools::CollapseFullPath(entry.FileName, directory);
       }
 
       // Queue the file if it has not yet been encountered and it
diff --git a/Source/cmGhsMultiTargetGenerator.cxx b/Source/cmGhsMultiTargetGenerator.cxx
index 9f8f12b96df4cc6b073e0b11ad6aab5d54a3c693..c73ec700e9047433ed3cff4f6057d2d1f0ae7d0c 100644
--- a/Source/cmGhsMultiTargetGenerator.cxx
+++ b/Source/cmGhsMultiTargetGenerator.cxx
@@ -287,7 +287,7 @@ void cmGhsMultiTargetGenerator::WriteTargetLinkLine(std::ostream& fout,
     if (l.compare(0, 2, "-l") == 0) {
       fout << "    \"" << l << "\"" << std::endl;
     } else {
-      std::string rl = cmSystemTools::CollapseCombinedPath(cbd, l);
+      std::string rl = cmSystemTools::CollapseFullPath(l, cbd);
       fout << "    -l\"" << rl << "\"" << std::endl;
     }
   }
diff --git a/Source/cmGlobalGhsMultiGenerator.cxx b/Source/cmGlobalGhsMultiGenerator.cxx
index 4f1d06a232fe4a57fc015389bb9a010667f8db50..dba9afa23d5efe767cbafba76464c9f4e69d43dd 100644
--- a/Source/cmGlobalGhsMultiGenerator.cxx
+++ b/Source/cmGlobalGhsMultiGenerator.cxx
@@ -185,8 +185,7 @@ void cmGlobalGhsMultiGenerator::GetToolset(cmMakefile* mf, std::string& tsd,
     }
   } else {
     std::string tryPath;
-    /* CollapseCombinedPath will check if ts is an absolute path */
-    tryPath = cmSystemTools::CollapseCombinedPath(tsd, ts);
+    tryPath = cmSystemTools::CollapseFullPath(ts, tsd);
     if (!cmSystemTools::FileExists(tryPath)) {
       std::string msg = "GHS toolset \"" + tryPath + "\" not found.";
       cmSystemTools::Error(msg);
diff --git a/Source/cmQtAutoGen.cxx b/Source/cmQtAutoGen.cxx
index 022947f66268ea8031bcac5c7bdafaf864fd238a..87ef112d4e35120882d2260a7665b752f34d8e58 100644
--- a/Source/cmQtAutoGen.cxx
+++ b/Source/cmQtAutoGen.cxx
@@ -309,7 +309,7 @@ void cmQtAutoGen::RccListConvertFullPath(std::string const& qrcFileDir,
                                          std::vector<std::string>& files)
 {
   for (std::string& entry : files) {
-    std::string tmp = cmSystemTools::CollapseCombinedPath(qrcFileDir, entry);
+    std::string tmp = cmSystemTools::CollapseFullPath(entry, qrcFileDir);
     entry = std::move(tmp);
   }
 }
diff --git a/Source/cmQtAutoGenerator.cxx b/Source/cmQtAutoGenerator.cxx
index af50c1dd46423f5e5c625dc05db9f9925ad8cae8..a1abd3f57281cd58ac55e2b0ed3803e15639668d 100644
--- a/Source/cmQtAutoGenerator.cxx
+++ b/Source/cmQtAutoGenerator.cxx
@@ -158,11 +158,11 @@ std::string cmQtAutoGenerator::FileSystem::GetRealPath(
   return cmSystemTools::GetRealPath(filename);
 }
 
-std::string cmQtAutoGenerator::FileSystem::CollapseCombinedPath(
-  std::string const& dir, std::string const& file)
+std::string cmQtAutoGenerator::FileSystem::CollapseFullPath(
+  std::string const& file, std::string const& dir)
 {
   std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::CollapseCombinedPath(dir, file);
+  return cmSystemTools::CollapseFullPath(file, dir);
 }
 
 void cmQtAutoGenerator::FileSystem::SplitPath(
diff --git a/Source/cmQtAutoGenerator.h b/Source/cmQtAutoGenerator.h
index 6771dd86924cd54a82650476e8b5771338cd09fe..b55bebc286a137e731d2b4bd221ec2a4a053ebfa 100644
--- a/Source/cmQtAutoGenerator.h
+++ b/Source/cmQtAutoGenerator.h
@@ -77,9 +77,9 @@ public:
     // -- Paths
     /// @brief Wrapper for cmSystemTools::GetRealPath
     std::string GetRealPath(std::string const& filename);
-    /// @brief Wrapper for cmSystemTools::CollapseCombinedPath
-    std::string CollapseCombinedPath(std::string const& dir,
-                                     std::string const& file);
+    /// @brief Wrapper for cmSystemTools::CollapseFullPath
+    std::string CollapseFullPath(std::string const& file,
+                                 std::string const& dir);
     /// @brief Wrapper for cmSystemTools::SplitPath
     void SplitPath(const std::string& p, std::vector<std::string>& components,
                    bool expand_home_dir = true);
diff --git a/Source/cmQtAutoGeneratorMocUic.cxx b/Source/cmQtAutoGeneratorMocUic.cxx
index b02cd44ccad21a7e3d5016451ea2ed2aa8cf0257..cb6f7eab1e1d3633f438e901dd653a2f2c8e8de4 100644
--- a/Source/cmQtAutoGeneratorMocUic.cxx
+++ b/Source/cmQtAutoGeneratorMocUic.cxx
@@ -27,7 +27,7 @@
 std::string cmQtAutoGeneratorMocUic::BaseSettingsT::AbsoluteBuildPath(
   std::string const& relativePath) const
 {
-  return FileSys->CollapseCombinedPath(AutogenBuildDir, relativePath);
+  return FileSys->CollapseFullPath(relativePath, AutogenBuildDir);
 }
 
 /**