From 75f9434374ec2ed5e0f516ff914e9c2b4c519e33 Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Fri, 19 Apr 2002 08:27:50 -0400
Subject: [PATCH] BUG: fix SameFile function for windows, and compare source
 directories

---
 Source/cmSystemTools.cxx | 42 ++++++++++++++++++++++++++++++++++++++++
 Source/cmake.cxx         | 18 +++++++----------
 2 files changed, 49 insertions(+), 11 deletions(-)

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 1f68b70de..5accbaae7 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -487,6 +487,47 @@ std::string cmSystemTools::EscapeQuotes(const char* str)
 
 bool cmSystemTools::SameFile(const char* file1, const char* file2)
 {
+#ifdef _WIN32
+  HANDLE hFile1, hFile2;
+
+  hFile1 = CreateFile( file1, 
+                      GENERIC_READ, 
+                      FILE_SHARE_READ ,
+                      NULL,
+                      OPEN_EXISTING,
+                      FILE_FLAG_BACKUP_SEMANTICS,
+                      NULL
+    );
+  hFile2 = CreateFile( file2, 
+                      GENERIC_READ, 
+                      FILE_SHARE_READ, 
+                      NULL,
+                      OPEN_EXISTING,
+                      FILE_FLAG_BACKUP_SEMANTICS,
+                      NULL
+    );
+  if( hFile1 == INVALID_HANDLE_VALUE || hFile2 == INVALID_HANDLE_VALUE)
+    {
+    if(hFile1 != INVALID_HANDLE_VALUE)
+      {
+      CloseHandle(hFile1);
+      }
+    if(hFile2 != INVALID_HANDLE_VALUE)
+      {
+      CloseHandle(hFile2);
+      }
+    return false;
+    }
+
+   BY_HANDLE_FILE_INFORMATION fiBuf1;
+   BY_HANDLE_FILE_INFORMATION fiBuf2;
+   GetFileInformationByHandle( hFile1, &fiBuf1 );
+   GetFileInformationByHandle( hFile2, &fiBuf2 );
+   CloseHandle(hFile1);
+   CloseHandle(hFile2);
+   return (fiBuf1.nFileIndexHigh == fiBuf2.nFileIndexHigh &&
+           fiBuf1.nFileIndexLow == fiBuf2.nFileIndexLow);
+#else
   struct stat fileStat1, fileStat2;
   if (stat(file1, &fileStat1) == 0 && stat(file2, &fileStat2) == 0)
     {
@@ -501,6 +542,7 @@ bool cmSystemTools::SameFile(const char* file1, const char* file2)
       }
     }
   return false;
+#endif
 }
 
 
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index cb6cfc1be..097b1befb 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -358,19 +358,15 @@ int cmake::Generate(const std::vector<std::string>& args, bool buildMakefiles)
   cmCacheManager::GetInstance()->LoadCache(&mf);
   if(mf.GetDefinition("CMAKE_HOME_DIRECTORY"))
     {
-    std::string cacheStart = 
-      cmSystemTools::CollapseFullPath(mf.GetDefinition("CMAKE_HOME_DIRECTORY"));
-    std::string currentStart = 
-      cmSystemTools::CollapseFullPath(mf.GetHomeDirectory());
-#ifdef _WIN32
-    cacheStart = cmSystemTools::LowerCase(cacheStart);
-    currentStart = cmSystemTools::LowerCase(currentStart);
-#endif
-    if(cacheStart != currentStart)
+    std::string cacheStart = mf.GetDefinition("CMAKE_HOME_DIRECTORY");
+    cacheStart += "/CMakeLists.txt";
+    std::string currentStart = mf.GetHomeDirectory();
+    currentStart += "/CMakeLists.txt";
+    if(!cmSystemTools::SameFile(cacheStart.c_str(), currentStart.c_str()))
       {
-      std::string message = "Error: source directory: ";
+      std::string message = "Error: source : ";
       message += currentStart;
-      message += "\nDoes not match source directory used to generate cache: ";
+      message += "\nDoes not match source used to generate cache: ";
       message += cacheStart;
       message += "\nRe-run cmake with a different source directory.";
       cmSystemTools::Error(message.c_str());