some refactoring around readline/libedit

(handle dependent options, allow user with change WITH_READLINE to
WITH_LIBEDIT and other way around after the first compile)

cmake/readline.cmake

@@ -13,16 +13,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA 
 
-MACRO(SET_WITH_BUNDLED_READLINE option)
-  IF(option)
-   SET(not_option OFF)
-  ELSE()
-   SET(not_option ON)
-  ENDIF()
-  SET(WITH_READLINE ${option} CACHE BOOL "Use bundled readline")
-  SET(WITH_LIBEDIT ${not_option} CACHE BOOL "Use bundled libedit")
-ENDMACRO()
-
 MACRO (MYSQL_CHECK_MULTIBYTE)
   CHECK_INCLUDE_FILE(wctype.h HAVE_WCTYPE_H)
   CHECK_INCLUDE_FILE(wchar.h HAVE_WCHAR_H)
@@ -119,8 +109,9 @@ MACRO (FIND_CURSES)
 ENDMACRO()
 
 MACRO (MYSQL_USE_BUNDLED_READLINE)
-  SET_WITH_BUNDLED_READLINE(ON)
   SET(USE_NEW_READLINE_INTERFACE 1)
+  SET(HAVE_HIST_ENTRY)
+  SET(USE_LIBEDIT_INTERFACE)
   SET(READLINE_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/cmd-line-utils)
   SET(READLINE_LIBRARY readline)
   FIND_CURSES()
@@ -128,26 +119,27 @@ MACRO (MYSQL_USE_BUNDLED_READLINE)
 ENDMACRO()
 
 MACRO (MYSQL_USE_BUNDLED_LIBEDIT)
-  SET_WITH_BUNDLED_READLINE(OFF)
-  SET(USE_LIBEDIT_INTERFACE 1 CACHE INTERNAL "")
-  SET(HAVE_HIST_ENTRY 1 CACHE INTERNAL "")
-  SET(READLINE_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/cmd-line-utils/libedit")
+  SET(USE_LIBEDIT_INTERFACE 1)
+  SET(HAVE_HIST_ENTRY 1)
+  SET(READLINE_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/cmd-line-utils/libedit)
   SET(READLINE_LIBRARY edit)
   FIND_CURSES()
   ADD_SUBDIRECTORY(${CMAKE_SOURCE_DIR}/cmd-line-utils/libedit)
 ENDMACRO()
 
+
 MACRO (MYSQL_FIND_SYSTEM_READLINE name)
-  FIND_PATH(SYSTEM_READLINE_INCLUDE_DIR readline/readline.h )
-  FIND_LIBRARY(SYSTEM_READLINE_LIBRARY NAMES ${name})
-  MARK_AS_ADVANCED(SYSTEM_READLINE_INCLUDE_DIR  SYSTEM_READLINE_LIBRARY)
+  
+  FIND_PATH(${name}_INCLUDE_DIR readline/readline.h )
+  FIND_LIBRARY(${name}_LIBRARY NAMES ${name})
+  MARK_AS_ADVANCED(${name}_INCLUDE_DIR  ${name}_LIBRARY)
 
   INCLUDE(CheckCXXSourceCompiles)
-  SET(CMAKE_REQUIRES_LIBRARIES ${SYSTEM_READLINE_LIBRARY})
+  SET(CMAKE_REQUIRES_LIBRARIES ${${name}_LIBRARY})
 
-  IF(SYSTEM_READLINE_LIBRARY AND SYSTEM_READLINE_INCLUDE_DIR)
+  IF(${name}_LIBRARY AND ${name}_INCLUDE_DIR)
     SET(SYSTEM_READLINE_FOUND 1)
-    SET(CMAKE_REQUIRED_LIBRARIES ${SYSTEM_READLINE_LIBRARY})
+    SET(CMAKE_REQUIRED_LIBRARIES ${${name}_LIBRARY})
     CHECK_CXX_SOURCE_COMPILES("
     #include <stdio.h>
     #include <readline/readline.h>
@@ -156,7 +148,7 @@ MACRO (MYSQL_FIND_SYSTEM_READLINE name)
        HIST_ENTRY entry;
        return 0;
     }"
-    HAVE_HIST_ENTRY)
+    ${name}_HAVE_HIST_ENTRY)
     
     CHECK_CXX_SOURCE_COMPILES("
     #include <stdio.h>
@@ -166,7 +158,7 @@ MACRO (MYSQL_FIND_SYSTEM_READLINE name)
       char res= *(*rl_completion_entry_function)(0,0);
       completion_matches(0,0);
     }"
-    USE_LIBEDIT_INTERFACE)
+    ${name}_USE_LIBEDIT_INTERFACE)
 
 
     CHECK_CXX_SOURCE_COMPILES("
@@ -177,31 +169,48 @@ MACRO (MYSQL_FIND_SYSTEM_READLINE name)
       rl_completion_func_t *func1= (rl_completion_func_t*)0;
       rl_compentry_func_t *func2= (rl_compentry_func_t*)0;
     }"
-    USE_NEW_READLINE_INTERFACE)
-    
-    IF(USE_LIBEDIT_INTERFACE  OR USE_NEW_READLINE_INTERFACE)
-      SET(READLINE_LIBRARY ${SYSTEM_READLINE_LIBRARY})
-      SET(READLINE_INCLUDE_DIR ${SYSTEM_READLINE_INCLUDE_DIR})
+    ${name}_USE_NEW_READLINE_INTERFACE)
+    
+    IF(${name}_USE_LIBEDIT_INTERFACE  OR ${name}_USE_NEW_READLINE_INTERFACE)
+      SET(READLINE_LIBRARY ${${name}_LIBRARY})
+      SET(READLINE_INCLUDE_DIR ${${name}_INCLUDE_DIR})
+      SET(HAVE_HIST_ENTRY ${${name}_HAVE_HIST_ENTRY})
+      SET(USE_LIBEDIT_INTERFACE ${${name}_USE_LIBEDIT_INTERFACE})
+      SET(USE_NEW_READLINE_INTERFACE ${${name}_USE_NEW_READLINE_INTERFACE})
       SET(READLINE_FOUND 1)
     ENDIF()
   ENDIF()
 ENDMACRO()
 
+
 MACRO (MYSQL_CHECK_READLINE)
   IF (NOT WIN32)
     MYSQL_CHECK_MULTIBYTE()
-    OPTION(WITH_READLINE "Use bundled readline" OFF)
     IF(NOT CYGWIN)	
-      # Bundled libedit does not compile on cygwin
-      OPTION(WITH_LIBEDIT  "Use bundled libedit" ON)
+      SET(WITH_LIBEDIT  ON CACHE BOOL  "Use bundled libedit")
+      SET(WITH_READLINE OFF CACHE BOOL "Use bundled readline")
     ELSE()
-      OPTION(WITH_LIBEDIT  "Use bundled libedit" OFF)
+      # Bundled libedit does not compile on cygwin, only readline
+      SET(WITH_READLINE OFF CACHE BOOL "Use bundled readline")
+    ENDIF()
+
+    # Handle mutual exclusion of WITH_READLINE/WITH_LIBEDIT variables
+    # We save current setting to recognize when user switched between
+    # WITH_READLINE and WITH_LIBEDIT 
+    IF(WITH_READLINE AND SAVE_READLINE_SETTING MATCHES "WITH_LIBEDIT"
+      OR NOT SAVE_READLINE_SETTING )
+      SET(WITH_LIBEDIT OFF CACHE BOOL "Use bundled libedit" FORCE)
+    ELSEIF(WITH_LIBEDIT AND SAVE_READLINE_SETTING MATCHES "WITH_READLINE"
+      OR NOT SAVE_READLINE_SETTING )
+      SET(WITH_READLINE OFF CACHE BOOL "Use bundled readline" FORCE)
     ENDIF()
 
     IF(WITH_READLINE)
      MYSQL_USE_BUNDLED_READLINE()
+     SET(SAVE_READLINE_SETTING WITH_READLINE CACHE INTERNAL "" FORCE)
     ELSEIF(WITH_LIBEDIT)
      MYSQL_USE_BUNDLED_LIBEDIT()
+     SET(SAVE_READLINE_SETTING WITH_LIBEDIT CACHE INTERNAL "" FORCE)
     ELSE()
       MYSQL_FIND_SYSTEM_READLINE(readline)
       IF(NOT READLINE_FOUND)