Fix:build:Turn feature flag variables into CMake cache vars, to expose them for tools like ccmake.

git-svn-id: http://svn.code.sf.net/p/navit/code/trunk/navit@5150 ffa7fe5e-494d-0410-b361-a75ebd5db220

1 files changed, 21 insertions, 12 deletions

diff --git a/cmake/navit_macros.cmake b/cmake/navit_macros.cmake
index a358b6bd0..0aafd44a1 100644
--- a/cmake/navit_macros.cmake
+++ b/cmake/navit_macros.cmake
@@ -1,48 +1,57 @@
-macro(internal_set VARIABLE REASON)
-   if (NOT DEFINED ${VARIABLE})
-      set(${VARIABLE} ${ARGN})
-      set(${VARIABLE}_REASON ${REASON} CACHE STRING "reason")
+macro(set_feature_switch_default VARIABLE REASON ENABLE)
+   if ((NOT DEFINED ${VARIABLE})              # variable not in cache (first run)
+      OR ((DEFINED ${VARIABLE}_ORIGINAL) AND  # variable in cache -> check for change
+      ((${VARIABLE}_ORIGINAL AND ${VARIABLE}) OR      # poor man's boolean equal
+     (NOT ${VARIABLE}_ORIGINAL AND NOT ${VARIABLE}))))
+      set(${VARIABLE}_REASON ${REASON})
+      set(${VARIABLE} ${ENABLE} CACHE BOOL "feature switch")
    else()
-      set(${VARIABLE}_REASON "User defined" CACHE STRING "reason")
+      set(${VARIABLE}_REASON "User defined")
    endif()
+   set(${VARIABLE}_ORIGINAL ${ENABLE} CACHE INTERNAL "original value set by build script")
 endmacro()
 
 macro(set_with_reason VARIABLE REASON ENABLE)
    if (DEFINED ${VARIABLE}_REASON AND NOT ${VARIABLE}_REASON STREQUAL "User defined")
-      set(${VARIABLE} ${ENABLE})
+      set(${VARIABLE} ${ENABLE} CACHE BOOL "feature switch" FORCE)
+      set(${VARIABLE}_ORIGINAL ${ENABLE} CACHE INTERNAL "original value set by build script")
       set(${VARIABLE}_REASON ${REASON})
       string(REPLACE "/" "_" VARIABLE_NAMES ${VARIABLE})
       set(${VARIABLE_NAMES}_LIBS ${ARGN})
    else()
-      message("Do not change user defined settings for ${VARIABLE}")
+      message(WARNING "Do not change user defined settings for ${VARIABLE}")
    endif()
 endmacro()
 
 macro(add_feature FEATURE REASON ENABLE)
    list(APPEND ALL_FEATURES ${FEATURE})
-   internal_set(${FEATURE} ${REASON} ${ENABLE})
+   set_feature_switch_default(${FEATURE} ${REASON} ${ENABLE})
 endmacro()
 
 macro(cfg_feature FEATURE REASON ENABLE)
    set(${FEATURE} ${ENABLE})
-   set(${FEATURE}_REASON ${REASON})
+   if (${FEATURE}_REASON STREQUAL "User defined")
+      set(${FEATURE}_REASON "${REASON} *user setting overridden*")
+   else()
+      set(${FEATURE}_REASON ${REASON})
+   endif()
 endmacro()
 
 macro(add_module MODULE_PATH REASON ENABLE)
    list(APPEND ALL_MODULES ${MODULE_PATH})
-   internal_set(${MODULE_PATH} ${REASON} ${ENABLE})
+   set_feature_switch_default(${MODULE_PATH} ${REASON} ${ENABLE})
 endmacro()
 
 # plugins are always linked static
 macro(add_plugin PLUGIN_PATH REASON ENABLE)
    list(APPEND ALL_PLUGINS ${PLUGIN_PATH})
-   internal_set(${PLUGIN_PATH} ${REASON} ${ENABLE})
+   set_feature_switch_default(${PLUGIN_PATH} ${REASON} ${ENABLE})
 endmacro()
 
 # module plugins are always linked static
 macro(add_module_plugin PLUGIN_PATH REASON ENABLE)
    list(APPEND ALL_MODULE_PLUGINS ${PLUGIN_PATH})
-   internal_set(${PLUGIN_PATH} ${REASON} ${ENABLE})
+   set_feature_switch_default(${PLUGIN_PATH} ${REASON} ${ENABLE})
 endmacro()
 
 macro(module_add_library MODULE_NAME )