[General] ESP-IDF compilation error when using freertos in custom project.

[blakjak44]

Briefly summarize the issue being raised Compilation was working fine earlier this year but since switching to ESP-IDF v4.2 and updating to the newest freertos version I am getting the following compilation error:

CMake Error at freertos/vendors/espressif/boards/esp32/CMakeLists.txt:455 (add_executable): add_executable cannot create target "dev_app" because another target with the same name already exists. The existing target is an executable created in source directory "~/afr-dev".

Describe the desired outcome I expect the project to compile so that I can flash the board.

System information

• Hardware board: ESP_32
• IDE used: No IDE, iTerm2
• Operating System: MacOS
• Code version: 202012.00-292-gda1da0611
• Project/Demo: Basic custom application from "Getting Started" guide
• Extensa version: xtensa-esp32-elf-gcc (crosstool-NG esp-2020r3) 8.4.0

References Compilation Command: ./freertos/vendors/espressif/esp-idf/tools/idf.py -DCOMPILER=xtensa-esp32 build

Compilation Log:

Setting IDF_PATH environment variable: /Users/blakjak/projects/personal/scratch/afr-dev/freertos/vendors/espressif/esp-idf
Executing action: all (aliases: build)
Running cmake in directory /Users/blakjak/projects/personal/scratch/afr-dev/build
Executing "cmake -G Ninja -DPYTHON_DEPS_CHECKED=1 -DESP_PLATFORM=1 -DCOMPILER=xtensa-esp32 -DCCACHE_ENABLE=0 /Users/blakjak/projects/personal/scratch/afr-dev"...
-- The C compiler identification is AppleClang 11.0.3.11030032
-- The CXX compiler identification is AppleClang 11.0.3.11030032
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/local/opt/ccache/libexec/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/local/opt/ccache/libexec/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Git: /usr/bin/git (found version "2.24.1 (Apple Git-126)")
-- Submodule update
Skipping submodule '../../../libraries/abstractions/backoff_algorithm/'
Skipping submodule '../../../../libraries/abstractions/pkcs11/corePKCS11/'
Skipping submodule '../../../libraries/abstractions/pkcs11/corePKCS11/'
Skipping submodule '../../../libraries/abstractions/pkcs11/corePKCS11/'
Skipping submodule '../../../libraries/abstractions/pkcs11/corePKCS11/'
Skipping submodule '../../../libraries/coreHTTP/'
Skipping submodule '../../../libraries/coreHTTP/'
Skipping submodule '../../../libraries/coreHTTP/'
Skipping submodule '../../../libraries/coreJSON/'
Skipping submodule '../../../libraries/coreJSON/'
Skipping submodule '../../../libraries/coreJSON/'
Skipping submodule '../../../libraries/coreMQTT/'
Skipping submodule '../../../libraries/coreMQTT/'
Skipping submodule '../../../libraries/coreMQTT/'
Skipping submodule '../../../libraries/device_defender_for_aws/'
Skipping submodule '../../../libraries/device_defender_for_aws/'
Skipping submodule '../../../libraries/device_defender_for_aws/'
Skipping submodule '../../../libraries/device_shadow_for_aws/'
Skipping submodule '../../../libraries/device_shadow_for_aws/'
Skipping submodule '../../../libraries/device_shadow_for_aws/'
Skipping submodule '../../libraries/freertos_plus/standard/freertos_plus_tcp/'
Skipping submodule '../../libraries/freertos_plus/standard/freertos_plus_tcp/'
Skipping submodule '../../libraries/freertos_plus/standard/freertos_plus_tcp/'
Skipping submodule '../../../libraries/jobs_for_aws/'
Skipping submodule '../../../libraries/jobs_for_aws/'
Skipping submodule '../../../libraries/jobs_for_aws/'
WARNING: IDF_PATH environment variable is not cleared.
    If CMake is generating an error, consider clearing the IDF_PATH environment
    variable, and generating a clean build. This message can be ignored if
    CMake was successful.
-- Component directory /Users/blakjak/projects/personal/scratch/afr-dev/freertos/vendors/espressif/esp-idf/components/mbedtls does not contain a CMakeLists.txt file. No component will be added
-- Component directory /Users/blakjak/projects/personal/scratch/afr-dev/freertos/vendors/espressif/esp-idf/components/unity does not contain a CMakeLists.txt file. No component will be added
CMake Error at freertos/vendors/espressif/boards/esp32/CMakeLists.txt:455 (add_executable):
  add_executable cannot create target "dev_app" because another target with
  the same name already exists.  The existing target is an executable created
  in source directory "/Users/blakjak/projects/personal/scratch/afr-dev".
  See documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  freertos/CMakeLists.txt:70 (include)

-- Checking Python dependencies...
Python requirements from /Users/blakjak/projects/personal/scratch/afr-dev/freertos/vendors/espressif/esp-idf/requirements.txt are satisfied.
Loading defaults file /Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults...
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:21 CONFIG_NIMBLE_ENABLED was replaced with CONFIG_BT_NIMBLE_ENABLED
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:22 CONFIG_NIMBLE_MAX_CONNECTIONS was replaced with CONFIG_BT_NIMBLE_MAX_CONNECTIONS
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:23 CONFIG_NIMBLE_MAX_BONDS was replaced with CONFIG_BT_NIMBLE_MAX_BONDS
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:24 CONFIG_NIMBLE_MAX_CCCDS was replaced with CONFIG_BT_NIMBLE_MAX_CCCDS
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:25 CONFIG_NIMBLE_L2CAP_COC_MAX_NUM was replaced with CONFIG_BT_NIMBLE_L2CAP_COC_MAX_NUM
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:26 CONFIG_NIMBLE_PINNED_TO_CORE was replaced with CONFIG_BT_NIMBLE_PINNED_TO_CORE
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:27 CONFIG_NIMBLE_ROLE_CENTRAL was replaced with CONFIG_BT_NIMBLE_ROLE_CENTRAL
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:28 CONFIG_NIMBLE_ROLE_PERIPHERAL was replaced with CONFIG_BT_NIMBLE_ROLE_PERIPHERAL
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:29 CONFIG_NIMBLE_ROLE_BROADCASTER was replaced with CONFIG_BT_NIMBLE_ROLE_BROADCASTER
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:30 CONFIG_NIMBLE_ROLE_OBSERVER was replaced with CONFIG_BT_NIMBLE_ROLE_OBSERVER
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:31 CONFIG_NIMBLE_NVS_PERSIST was replaced with CONFIG_BT_NIMBLE_NVS_PERSIST
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:32 CONFIG_NIMBLE_SM_LEGACY was replaced with CONFIG_BT_NIMBLE_SM_LEGACY
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:33 CONFIG_NIMBLE_SM_SC was replaced with CONFIG_BT_NIMBLE_SM_SC
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:34 CONFIG_NIMBLE_DEBUG was replaced with CONFIG_BT_NIMBLE_DEBUG
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:35 CONFIG_NIMBLE_SVC_GAP_DEVICE_NAME was replaced with CONFIG_BT_NIMBLE_SVC_GAP_DEVICE_NAME
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:36 CONFIG_NIMBLE_GAP_DEVICE_NAME_MAX_LEN was replaced with CONFIG_BT_NIMBLE_GAP_DEVICE_NAME_MAX_LEN
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:37 CONFIG_NIMBLE_ATT_PREFERRED_MTU was replaced with CONFIG_BT_NIMBLE_ATT_PREFERRED_MTU
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:38 CONFIG_NIMBLE_SVC_GAP_APPEARANCE was replaced with CONFIG_BT_NIMBLE_SVC_GAP_APPEARANCE
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:39 CONFIG_NIMBLE_ACL_BUF_COUNT was replaced with CONFIG_BT_NIMBLE_ACL_BUF_COUNT
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:40 CONFIG_NIMBLE_ACL_BUF_SIZE was replaced with CONFIG_BT_NIMBLE_ACL_BUF_SIZE
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:41 CONFIG_NIMBLE_HCI_EVT_BUF_SIZE was replaced with CONFIG_BT_NIMBLE_HCI_EVT_BUF_SIZE
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:42 CONFIG_NIMBLE_HCI_EVT_HI_BUF_COUNT was replaced with CONFIG_BT_NIMBLE_HCI_EVT_HI_BUF_COUNT
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:43 CONFIG_NIMBLE_HCI_EVT_LO_BUF_COUNT was replaced with CONFIG_BT_NIMBLE_HCI_EVT_LO_BUF_COUNT
/Users/blakjak/projects/personal/scratch/afr-dev/build/sdkconfig.defaults:44 CONFIG_NIMBLE_MESH was replaced with CONFIG_BT_NIMBLE_MESH
/var/folders/f8/m683xysx4pg4rfq05gchmcdc0000gn/T/confgen_tmpnh2s9rnu:20 line was updated to CONFIG_BT_BLUEDROID_ENABLED=n
/var/folders/f8/m683xysx4pg4rfq05gchmcdc0000gn/T/confgen_tmpnh2s9rnu:34 line was updated to CONFIG_BT_NIMBLE_DEBUG=n
/var/folders/f8/m683xysx4pg4rfq05gchmcdc0000gn/T/confgen_tmpnh2s9rnu:44 line was updated to CONFIG_BT_NIMBLE_MESH=n
CMake Error at freertos/vendors/espressif/esp-idf/components/esp32/project_include.cmake:21 (message):
  Internal error, toolchain has not been set correctly by project (or an
  invalid CMakeCache.txt file has been generated somehow)
Call Stack (most recent call first):
  freertos/vendors/espressif/esp-idf/tools/cmake/build.cmake:306 (include)
  freertos/vendors/espressif/esp-idf/tools/cmake/build.cmake:451 (__build_process_project_includes)
  freertos/vendors/espressif/boards/esp32/CMakeLists.txt:581 (idf_build_process)
  freertos/CMakeLists.txt:70 (include)

-- Configuring incomplete, errors occurred!
See also "/Users/blakjak/projects/personal/scratch/afr-dev/build/CMakeFiles/CMakeOutput.log".
cmake failed with exit code 1

Code/Steps to reproduce the current status Project Structure:

- freertos
- src
    - main.c
- CMakeLists.txt

CMakeLists.text:

cmake_minimum_required(VERSION 3.13)

project(afr-dev)

add_executable(dev_app src/main.c)

# Tell IDF build to link against this target.
set(IDF_PROJECT_EXECUTABLE dev_app)

# Add FreeRTOS as a subdirectory. AFR_BOARD tells which board to target.
set(AFR_BOARD espressif.esp32_devkitc CACHE INTERNAL "")

add_subdirectory(freertos)

# Link against the mqtt library so that we can use it. Dependencies are transitively
# linked.
target_link_libraries(dev_app PRIVATE AFR::mqtt AFR::utils)

main.c:

/*
 * FreeRTOS V1.4.7
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

#include "iot_config.h"
#include "iot_network_config.h"

/* FreeRTOS includes. */

#include "FreeRTOS.h"
#include "task.h"

/* Demo includes */
//#include "aws_demo.h"
//#include "aws_dev_mode_key_provisioning.h"

/* AWS System includes. */
#include "bt_hal_manager.h"
#include "iot_system_init.h"
#include "iot_logging_task.h"

#include "nvs_flash.h"
#if !AFR_ESP_LWIP
    #include "FreeRTOS_IP.h"
    #include "FreeRTOS_Sockets.h"
#endif

#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_interface.h"
#include "esp_bt.h"
#if CONFIG_NIMBLE_ENABLED == 1
    #include "esp_nimble_hci.h"
#else
    #include "esp_gap_ble_api.h"
    #include "esp_bt_main.h"
#endif

#include "driver/uart.h"
#include "aws_application_version.h"
#include "tcpip_adapter.h"

//#include "iot_network_manager_private.h"

#if BLE_ENABLED
    #include "bt_hal_manager_adapter_ble.h"
    #include "bt_hal_manager.h"
    #include "bt_hal_gatt_server.h"

    #include "iot_ble.h"
    #include "iot_ble_config.h"
    #include "iot_ble_wifi_provisioning.h"
    //#include "iot_ble_numericComparison.h"
#endif

//#include "ble_provisioning.h"

/* Logging Task Defines. */
#define mainLOGGING_MESSAGE_QUEUE_LENGTH    ( 32 )
#define mainLOGGING_TASK_STACK_SIZE         ( configMINIMAL_STACK_SIZE * 4 )
#define mainDEVICE_NICK_NAME                "Espressif_Demo"

QueueHandle_t spp_uart_queue = NULL;

/* Static arrays for FreeRTOS+TCP stack initialization for Ethernet network connections
 * are use are below. If you are using an Ethernet connection on your MCU device it is
 * recommended to use the FreeRTOS+TCP stack. The default values are defined in
 * FreeRTOSConfig.h. */

/**
 * @brief Initializes the board.
 */
static void prvMiscInitialization( void );

#if BLE_ENABLED
/* Initializes bluetooth */
    static esp_err_t prvBLEStackInit( void );
    /** Helper function to teardown BLE stack. **/
    esp_err_t xBLEStackTeardown( void );
    static void spp_uart_init( void );
#endif

/*-----------------------------------------------------------*/

/**
 * @brief Application runtime entry point.
 */
int app_main( void )
{
    /* Perform any hardware initialization that does not require the RTOS to be
     * running.  */

    prvMiscInitialization();

    if( SYSTEM_Init() == pdPASS )
    {
        /* A simple example to demonstrate key and certificate provisioning in
         * microcontroller flash using PKCS#11 interface. This should be replaced
         * by production ready key provisioning mechanism. */
        //vDevModeKeyProvisioning();

        #if BLE_ENABLED
            /* Initialize BLE. */
            ESP_ERROR_CHECK( esp_bt_controller_mem_release( ESP_BT_MODE_CLASSIC_BT ) );

            if( prvBLEStackInit() != ESP_OK )
            {
                configPRINTF( ( "Failed to initialize the bluetooth stack\n " ) );

                while( 1 )
                {
                }
            }
        #else
            configPRINTF( ( "Bluetooth disabled.\n " ) );
            ESP_ERROR_CHECK( esp_bt_controller_mem_release( ESP_BT_MODE_CLASSIC_BT ) );
            ESP_ERROR_CHECK( esp_bt_controller_mem_release( ESP_BT_MODE_BLE ) );
        #endif /* if BLE_ENABLED */
        /* Run all demos. */
        //DEMO_RUNNER_RunDemos();
        //bleEnable();
    }

    /* Start the scheduler.  Initialization that requires the OS to be running,
     * including the WiFi initialization, is performed in the RTOS daemon task
     * startup hook. */
    /* Following is taken care by initialization code in ESP IDF */
    /* vTaskStartScheduler(); */
    return 0;
}

/*-----------------------------------------------------------*/
extern void vApplicationIPInit( void );
static void prvMiscInitialization( void )
{
    /* Initialize NVS */
    esp_err_t ret = nvs_flash_init();

    if( ( ret == ESP_ERR_NVS_NO_FREE_PAGES ) || ( ret == ESP_ERR_NVS_NEW_VERSION_FOUND ) )
    {
        ESP_ERROR_CHECK( nvs_flash_erase() );
        ret = nvs_flash_init();
    }

    ESP_ERROR_CHECK( ret );

    #if BLE_ENABLED
        //NumericComparisonInit();
        spp_uart_init();
    #endif

    /* Create tasks that are not dependent on the WiFi being initialized. */
    xLoggingTaskInitialize( mainLOGGING_TASK_STACK_SIZE,
                            tskIDLE_PRIORITY + 5,
                            mainLOGGING_MESSAGE_QUEUE_LENGTH );

#if AFR_ESP_LWIP
    configPRINTF( ("Initializing lwIP TCP stack\r\n") );
    tcpip_adapter_init();
#else
    configPRINTF( ("Initializing FreeRTOS TCP stack\r\n") );
    vApplicationIPInit();
#endif
}

/*-----------------------------------------------------------*/

#if BLE_ENABLED

    #if CONFIG_NIMBLE_ENABLED == 1
        esp_err_t prvBLEStackInit( void )
        {
            return ESP_OK;
        }

        esp_err_t xBLEStackTeardown( void )
        {
            esp_err_t xRet;

            xRet = esp_bt_controller_mem_release( ESP_BT_MODE_BLE );

            return xRet;
        }

    #else /* if CONFIG_NIMBLE_ENABLED == 1 */

        static esp_err_t prvBLEStackInit( void )
        {
            return ESP_OK;
        }

        esp_err_t xBLEStackTeardown( void )
        {
            esp_err_t xRet = ESP_OK;

            if( esp_bluedroid_get_status() == ESP_BLUEDROID_STATUS_ENABLED )
            {
                xRet = esp_bluedroid_disable();
            }

            if( xRet == ESP_OK )
            {
                xRet = esp_bluedroid_deinit();
            }

            if( xRet == ESP_OK )
            {
                if( esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED )
                {
                    xRet = esp_bt_controller_disable();
                }
            }

            if( xRet == ESP_OK )
            {
                xRet = esp_bt_controller_deinit();
            }

            if( xRet == ESP_OK )
            {
                xRet = esp_bt_controller_mem_release( ESP_BT_MODE_BLE );
            }

            if( xRet == ESP_OK )
            {
                xRet = esp_bt_controller_mem_release( ESP_BT_MODE_BTDM );
            }

            return xRet;
        }
    #endif /* if CONFIG_NIMBLE_ENABLED == 1 */
#endif /* if BLE_ENABLED */

/*-----------------------------------------------------------*/

#if BLE_ENABLED
    static void spp_uart_init( void )
    {
        uart_config_t uart_config =
        {
            .baud_rate           = 115200,
            .data_bits           = UART_DATA_8_BITS,
            .parity              = UART_PARITY_DISABLE,
            .stop_bits           = UART_STOP_BITS_1,
            .flow_ctrl           = UART_HW_FLOWCTRL_RTS,
            .rx_flow_ctrl_thresh = 122,
        };

        /* Set UART parameters */
        uart_param_config( UART_NUM_0, &uart_config );
        /*Set UART pins */
        uart_set_pin( UART_NUM_0, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE );
        /*Install UART driver, and get the queue. */
        uart_driver_install( UART_NUM_0, 4096, 8192, 10, &spp_uart_queue, 0 );
    }

/*-----------------------------------------------------------*/

    //BaseType_t getUserMessage( INPUTMessage_t * pxINPUTmessage,
    //                           TickType_t xAuthTimeout )
    //{
    //    uart_event_t xEvent;
    //    BaseType_t xReturnMessage = pdFALSE;

    //    if( xQueueReceive( spp_uart_queue, ( void * ) &xEvent, ( portTickType ) xAuthTimeout ) )
    //    {
    //        switch( xEvent.type )
    //        {
    //            /*Event of UART receiving data */
    //            case UART_DATA:

    //                if( xEvent.size )
    //                {
    //                    pxINPUTmessage->pcData = ( uint8_t * ) malloc( sizeof( uint8_t ) * xEvent.size );

    //                    if( pxINPUTmessage->pcData != NULL )
    //                    {
    //                        memset( pxINPUTmessage->pcData, 0x0, xEvent.size );
    //                        uart_read_bytes( UART_NUM_0, ( uint8_t * ) pxINPUTmessage->pcData, xEvent.size, portMAX_DELAY );
    //                        xReturnMessage = pdTRUE;
    //                    }
    //                    else
    //                    {
    //                        configPRINTF( ( "Malloc failed in main.c\n" ) );
    //                    }
    //                }

    //                break;

    //            default:
    //                break;
    //        }
    //    }

    //    return xReturnMessage;
    //}
#endif /* if BLE_ENABLED */

/*-----------------------------------------------------------*/

extern void esp_vApplicationTickHook();
void IRAM_ATTR vApplicationTickHook()
{
    esp_vApplicationTickHook();
}
/*-----------------------------------------------------------*/

extern void esp_vApplicationIdleHook();
void vApplicationIdleHook()
{
    esp_vApplicationIdleHook();
}
/*-----------------------------------------------------------*/

void vApplicationDaemonTaskStartupHook( void )
{
}
/*-----------------------------------------------------------*/

/**
 * @brief This is to provide memory that is used by the Idle task.
 *
 * If configUSE_STATIC_ALLOCATION is set to 1, then the application must provide an
 * implementation of vApplicationGetIdleTaskMemory() in order to provide memory to
 * the Idle task.
 */
void vApplicationGetIdleTaskMemory( StaticTask_t ** ppxIdleTaskTCBBuffer,
                                    StackType_t ** ppxIdleTaskStackBuffer,
                                    uint32_t * pulIdleTaskStackSize )
{
    /* If the buffers to be provided to the Idle task are declared inside this
     * function then they must be declared static - otherwise they will be allocated on
     * the stack and so not exists after thisfunction exits. */
    static StaticTask_t xIdleTaskTCB;
    static StackType_t uxIdleTaskStack[ configMINIMAL_STACK_SIZE ];

    /* Pass out a pointer to the StaticTask_t structure in which the Idle
     * task's state will be stored. */
    *ppxIdleTaskTCBBuffer = &xIdleTaskTCB;

    /* Pass out the array that will be used as the Idle task's stack. */
    *ppxIdleTaskStackBuffer = uxIdleTaskStack;

    /* Pass out the size of the array pointed to by *ppxIdleTaskStackBuffer.
     * Note that, as the array is necessarily of type StackType_t,
     * configMINIMAL_STACK_SIZE is specified in words, not bytes. */
    *pulIdleTaskStackSize = configMINIMAL_STACK_SIZE;
}
/*-----------------------------------------------------------*/

/**
 * @brief This is to provide the memory that is used by the RTOS daemon/time task.
 *
 * If configUSE_STATIC_ALLOCATION is set to 1, then application must provide an
 * implementation of vApplicationGetTimerTaskMemory() in order to provide memory
 * to the RTOS daemon/time task.
 */
void vApplicationGetTimerTaskMemory( StaticTask_t ** ppxTimerTaskTCBBuffer,
                                     StackType_t ** ppxTimerTaskStackBuffer,
                                     uint32_t * pulTimerTaskStackSize )
{
    /* If the buffers to be provided to the Timer task are declared inside this
     * function then they must be declared static - otherwise they will be allocated on
     * the stack and so not exists after this function exits. */
    static StaticTask_t xTimerTaskTCB;
    static StackType_t uxTimerTaskStack[ configTIMER_TASK_STACK_DEPTH ];

    /* Pass out a pointer to the StaticTask_t structure in which the Idle
     * task's state will be stored. */
    *ppxTimerTaskTCBBuffer = &xTimerTaskTCB;

    /* Pass out the array that will be used as the Timer task's stack. */
    *ppxTimerTaskStackBuffer = uxTimerTaskStack;

    /* Pass out the size of the array pointed to by *ppxTimerTaskStackBuffer.
     * Note that, as the array is necessarily of type StackType_t,
     * configMINIMAL_STACK_SIZE is specified in words, not bytes. */
    *pulTimerTaskStackSize = configTIMER_TASK_STACK_DEPTH;
}
/*-----------------------------------------------------------*/ 

#if !AFR_ESP_LWIP
/*-----------------------------------------------------------*/
void vApplicationIPNetworkEventHook( eIPCallbackEvent_t eNetworkEvent )
{
    uint32_t ulIPAddress, ulNetMask, ulGatewayAddress, ulDNSServerAddress;
    system_event_t evt;

    if( eNetworkEvent == eNetworkUp )
    {
        /* Print out the network configuration, which may have come from a DHCP
         * server. */
        FreeRTOS_GetAddressConfiguration(
            &ulIPAddress,
            &ulNetMask,
            &ulGatewayAddress,
            &ulDNSServerAddress );

        evt.event_id = SYSTEM_EVENT_STA_GOT_IP;
        evt.event_info.got_ip.ip_changed = true;
        evt.event_info.got_ip.ip_info.ip.addr = ulIPAddress;
        evt.event_info.got_ip.ip_info.netmask.addr = ulNetMask;
        evt.event_info.got_ip.ip_info.gw.addr = ulGatewayAddress;
        esp_event_send( &evt );
    }
}
#endif

Additional context If I run the identical compilation command inside freertos to build the demo project, the project compiles fine. This is only when building a custom project that consumes freertos.

[Johnnyjax]

I think I came across this issue when migrating to esp-idf 4.2 too. Check out the cmakelists file in this repository. It should help with fixing the issue

[pvyawaha]

Hello ,

Were you able to fix the build issue?

[blakjak44]

Just got around to this now. I tried @Johnnyjax's suggestion and tried copying the CMakeList.txt file from that repo but still got a compilation error. I just ran the test quickly and only modified a couple lines so it's possible that I need to configure it properly. I'm going to try just cloning that repo and building from that when I have chance.

I will say that I didn't get the error add_executable cannot create target "dev_app" because another target with the same name already exists, but that's likely because add_executable call has been removed.

[blakjak44]

@pvyawaha I was able to get the build to work using the example repo mentioned by @Johnnyjax. Considering the cmakelists deviates quite a bit for idf v4.2, the docs in the Getting Started guide should be updated.

[aggarw13]

@blakjak44, great that you have been able to get the custom CMake project building. Thank you for notifying about the documentation issues in the guide. We will look to update the instructions soon.