From 96dd383ceb6568ca4e02c71b271cca394ade6e55 Mon Sep 17 00:00:00 2001
From: KWSys Upstream <kwrobot@kitware.com>
Date: Mon, 17 Feb 2020 11:58:07 -0500
Subject: KWSys 2020-02-17 (3e117fe1)

Code extracted from:

    https://gitlab.kitware.com/utils/kwsys.git

at commit 3e117fe1e008aeca4a4f33a431b196848cc34e11 (master).

Upstream Shortlog
-----------------

Brad King (1):
      c2420a42 SystemTools: Revert "CopyFileIfDifferent: Ensure that source is a file"

Julien Schueller (1):
      c3acc96d CMake: Fix psapi lib name on case-sensitive fs

Sebastian Lipponer (2):
      573713fa SystemTools: CopyFileIfDifferent: Ensure that source is a file
      ea77593a SystemTools: CopyFileIfDifferent: Fix endless recursion
---
 CMakeLists.txt      |  2 +-
 SystemTools.cxx     | 15 +++++++++------
 testSystemTools.cxx |  9 +++++++++
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09bcdb9..aa788e9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -536,7 +536,7 @@ IF(KWSYS_USE_SystemInformation)
   ENDIF()
   IF(WIN32)
     INCLUDE(CheckSymbolExists)
-    SET(CMAKE_REQUIRED_LIBRARIES Psapi)
+    SET(CMAKE_REQUIRED_LIBRARIES psapi)
     CHECK_SYMBOL_EXISTS(GetProcessMemoryInfo "windows.h;psapi.h" KWSYS_SYS_HAS_PSAPI)
     UNSET(CMAKE_REQUIRED_LIBRARIES)
     IF(KWSYS_SYS_HAS_PSAPI)
diff --git a/SystemTools.cxx b/SystemTools.cxx
index 39873e6..d27081b 100644
--- a/SystemTools.cxx
+++ b/SystemTools.cxx
@@ -2186,12 +2186,15 @@ bool SystemTools::CopyFileIfDifferent(const std::string& source,
   // FilesDiffer does not handle file to directory compare
   if (SystemTools::FileIsDirectory(destination)) {
     const std::string new_destination = FileInDir(source, destination);
-    return SystemTools::CopyFileIfDifferent(source, new_destination);
-  }
-  // source and destination are files so do a copy if they
-  // are different
-  if (SystemTools::FilesDiffer(source, destination)) {
-    return SystemTools::CopyFileAlways(source, destination);
+    if (!SystemTools::ComparePath(new_destination, destination)) {
+      return SystemTools::CopyFileIfDifferent(source, new_destination);
+    }
+  } else {
+    // source and destination are files so do a copy if they
+    // are different
+    if (SystemTools::FilesDiffer(source, destination)) {
+      return SystemTools::CopyFileAlways(source, destination);
+    }
   }
   // at this point the files must be the same so return true
   return true;
diff --git a/testSystemTools.cxx b/testSystemTools.cxx
index 1f3a15b..3f6eeb8 100644
--- a/testSystemTools.cxx
+++ b/testSystemTools.cxx
@@ -1074,6 +1074,15 @@ static bool CheckCopyFileIfDifferent()
     }
   }
 
+  if (!kwsys::SystemTools::MakeDirectory("dir_a") ||
+      !kwsys::SystemTools::MakeDirectory("dir_b")) {
+    return false;
+  }
+
+  if (!kwsys::SystemTools::CopyFileIfDifferent("dir_a/", "dir_b")) {
+    ret = false;
+  }
+
   return ret;
 }
 
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