le_apiFeatures.h

    1 /** @file le_apiFeatures.h
    2  *
    3  * API feature selection for Legato.  This file provides a mapping of KConfig selections to API
    4  * functions that are available.  As an example, if file system support is disabled, then a
    5  * compile-time error will be generated if an le_fs function is used.
    6  *
    7  * Copyright (C) Sierra Wireless Inc.
    8  */
    9 
   10 #ifndef LEGATO_APIFEATURES_INCLUDE_GUARD
   11 #define LEGATO_APIFEATURES_INCLUDE_GUARD
   12 
   13 //--------------------------------------------------------------------------------------------------
   14 /**
   15  * Mark a function as disabled due to a KConfig selection.
   16  *
   17  * @param   setting Configuration setting name string.
   18  */
   19 //--------------------------------------------------------------------------------------------------
   20 #if (defined(__GNUC__) && !defined(__clang__)) || __has_attribute(error)
   21 #  define LE_FUNC_DISABLED(setting) \
   22     __attribute__((error("Function unavailable due to " setting " configuration")))
   23 #elif __has_attribute(enable_if)
   24 #  define LE_FUNC_DISABLED(setting) \
   25     __attribute__((enable_if(0, "Function unavailable due to " setting " configuration")))
   26 #else
   27 #  define LE_FUNC_DISABLED(setting)
   28 #endif
   29 
   30 //--------------------------------------------------------------------------------------------------
   31 /**
   32  * Macro used to declare that a symbol is part of the "full" Legato API.
   33  *
   34  * There are two APIs for Legato: "full" and "limited".  Linux uses the "full" API and all
   35  * functions are available.  On other platforms only the "limited" API is supported, and
   36  * any attempt to use a "full" api function will lead to a compile error.
   37  */
   38 //--------------------------------------------------------------------------------------------------
   39 #if LE_CONFIG_LINUX
   40 #  define LE_FULL_API
   41 #else
   42 #  define LE_FULL_API LE_FUNC_DISABLED("LINUX")
   43 #endif
   44 
   45 /// API requires filesystem support.
   46 #if LE_CONFIG_FILESYSTEM
   47 #  define LE_API_FILESYSTEM
   48 #else
   49 #  define LE_API_FILESYSTEM LE_FUNC_DISABLED("FILESYSTEM")
   50 #endif
   51 
   52 #if LE_CONFIG_ENABLE_LE_JSON_API
   53 #  define LE_API_JSON
   54 #else
   55 #  define LE_API_JSON LE_FUNC_DISABLED("ENABLE_LE_JSON_API")
   56 #endif
   57 
   58 #endif /* end LEGATO_APIFEATURES_INCLUDE_GUARD */