owner-nrf52sdk/nRF5_SDK_15.3.0/components/libraries/util/sdk_alloca.h

/**
 * Copyright (c) 2017 - 2019, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
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 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
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 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
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 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
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/** @file sdk_alloca.h
 *
 * @brief Defines alloca() function.
 *
 * @details This file defines alloca() function. This can be done directly or by including system
 * header files. Not all platforms support alloca(). In this case no error will be shown, but
 * SDK_ALLOCA_DEFINED will be set to 0.
 */

#ifndef SDK_ALLOCA_H__
#define SDK_ALLOCA_H__


#if defined(__SDK_DOXYGEN__)
    /** @brief Set to one it alloca() function is available on this platform and it is correctly defined
     *  by this header file.
     */
    #define SDK_ALLOCA_DEFINED 1
#elif defined(__GNUC__)
    #if defined(__SES_ARM)
        // SES does not have definition of alloca(), but it have working GCC's __builtin_alloca().
        #if !defined(alloca)
            #define alloca(size) __builtin_alloca((size))
        #endif
    #else
        // alloca() can be defined in <malloc.h> on some platforms, but if not then try standard <alloca.h> header file.
        #include <malloc.h>
        #if !defined(alloca)
            #include <alloca.h>
        #endif
    #endif
    #define SDK_ALLOCA_DEFINED 1
#elif defined(__IAR_SYSTEMS_ICC__)
    // IAR does not support alloca() function.
    #define SDK_ALLOCA_DEFINED 0
#else
    // All other supported compilers have alloca() definition in <alloca.h> header file.
    #include <alloca.h>
    #define SDK_ALLOCA_DEFINED 1
#endif


/*lint -"d__builtin_alloca=(void*)" */


#endif // NRF_ALLOCA_H__