Bug#16316074 RFE: MAKE TMPDIR A BUILD-TIME CONFIGURABLE OPTION

Bug#68338    RFE: make tmpdir a build-time configurable option

Post-push fix: windows needs DEFAULT_TMPDIR as well.

CMakeLists.txt

@@ -329,17 +329,15 @@ IF(SYSCONFDIR)
   SET(DEFAULT_SYSCONFDIR "${SYSCONFDIR}")
 ENDIF()
 
-IF(UNIX)
-  SET(TMPDIR "P_tmpdir"
-    CACHE PATH
-    "PATH to MySQL TMP dir. Defaults to the P_tmpdir macro in <stdio.h>")
-  IF(TMPDIR STREQUAL "P_tmpdir")
-    # Do not quote it, to refer to the P_tmpdir macro.
-    SET(DEFAULT_TMPDIR "P_tmpdir")
-  ELSE()
-    # Quote it, to make it a const char string.
-    SET(DEFAULT_TMPDIR "\"${TMPDIR}\"")
-  ENDIF()
+SET(TMPDIR "P_tmpdir"
+  CACHE PATH
+  "PATH to MySQL TMP dir. Defaults to the P_tmpdir macro in <stdio.h>")
+IF(TMPDIR STREQUAL "P_tmpdir")
+  # Do not quote it, to refer to the P_tmpdir macro.
+  SET(DEFAULT_TMPDIR "P_tmpdir")
+ELSE()
+  # Quote it, to make it a const char string.
+  SET(DEFAULT_TMPDIR "\"${TMPDIR}\"")
 ENDIF()
 
 # Run platform tests