because of the high cost associated with fake symdir resolution, disable...

because of the high cost associated with  fake symdir resolution, disable symbolic-links on Windows by default. Real symlinks (Vista+) as well as NTFS junctions (prior to Vista) do not require this parameter

cmake/ssl.cmake

@@ -69,8 +69,10 @@ MACRO (MYSQL_CHECK_SSL)
     FIND_LIBRARY(CRYPTO_LIBRARY crypto)
     MARK_AS_ADVANCED(CRYPTO_LIBRARY)
     INCLUDE(CheckSymbolExists)
+    SET(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
     CHECK_SYMBOL_EXISTS(SHA512_DIGEST_LENGTH "openssl/sha.h" 
                         HAVE_SHA512_DIGEST_LENGTH)
+    SET(CMAKE_REQUIRED_INCLUDES)
     IF(OPENSSL_FOUND AND CRYPTO_LIBRARY AND HAVE_SHA512_DIGEST_LENGTH)
       SET(SSL_SOURCES "")
       SET(SSL_LIBRARIES ${OPENSSL_LIBRARIES} ${CRYPTO_LIBRARY})

mysys/my_access.c

@@ -26,11 +26,6 @@
     path 	Path to file
     amode	Access method
  
-  DESCRIPTION
-    This function wraps the normal access method because the access 
-    available in MSVCRT> +reports that filenames such as LPT1 and 
-    COM1 are valid (they are but should not be so for us).
- 
   RETURN VALUES
   0    ok
   -1   error  (We use -1 as my_access is mapped to access on other platforms)
@@ -38,12 +33,11 @@
 
 int my_access(const char *path, int amode) 
 { 
-  WIN32_FILE_ATTRIBUTE_DATA fileinfo;
-  BOOL result;
-	
-  result= GetFileAttributesEx(path, GetFileExInfoStandard, &fileinfo);
-  if (! result ||
-      (fileinfo.dwFileAttributes & FILE_ATTRIBUTE_READONLY) && (amode & W_OK))
+  DWORD attributes;
+
+  attributes = GetFileAttributes(path);
+  if (attributes == INVALID_FILE_ATTRIBUTES ||
+      (attributes & FILE_ATTRIBUTE_READONLY) && (amode & W_OK))
   {
     my_errno= errno= EACCES;
     return -1;

sql/mysqld.cc

@@ -6334,8 +6334,10 @@ struct my_option my_long_options[]=
      The system call realpath() produces warnings under valgrind and
      purify. These are not suppressed: instead we disable symlinks
      option if compiled with valgrind support.
+     Also disable by default on Windows, due to high overhead for checking .sym 
+     files.
    */
-   IF_VALGRIND(0,1), 0, 0, 0, 0, 0},
+   IF_VALGRIND(0,IF_WIN(0,1)), 0, 0, 0, 0, 0},
   {"debug-no-sync", 0,
    "Disables system sync calls. Only for running tests or debugging!",
    &my_disable_sync, &my_disable_sync, 0, GET_BOOL, NO_ARG, 1, 0, 0, 0, 0, 0},