How to add a cpp file into c project in MCUXpresso IDE

[misterbee]

I took a sample of freertos_hello from the SDK, build and run on target and it is running fine. I use MCUXpresso IDE.

I want to add a task entry APP_sensorTask() inside main(). The definition of this task entry is in App.h like following:

#ifndef APP_APP_H_
#define APP_APP_H_

#ifdef __cplusplus
extern "C" {
#endif

// App task entries.
void APP_sensorTask(void *argument);

#ifdef __cplusplus
}
#endif
#endif /* APP_APP_H_ */

Then the implementation is in App.cpp like following:

// Project includes.
#include "App.h"

void APP_sensorTask(void *argument) {
	for (;;) {
			// TODO.
	    }
}

Then I include App.h inside the main() file.

But this creates linking error:

source/main.c:60: undefined reference to `APP_sensorTask'

This means the project base not recognizing and compiling this .cpp file. I have been using this on another project using another IDE and it works fine. Anything I miss here?

[garkbeda43]

I use mostly Segger Embedded Studio now. Runs on Linux, and supports multiple vendors. At one point I got tired of installing another 1GB vendor-specific toolchain just for one board.

[davenadler]

@misterbee- Your project needs to be a C++ project, otherwise you'll be missing stuff you need.
Its no problem to convert an existing project, I've done this many times as our applications are primarily C++.
Basically you just need to:
   File > New menu and then select ‘Convert to a C/C++ Project (Adds C/C++ Nature)
For some more explanation, see:
https://mcuoneclipse.com/2020/07/11/from-c-to-c-converting-eclipse-c-projekts/ 
https://dzone.com/articles/from-c-to-c-converting-eclipse-c-projects 
Or just google: https://bfy.tw/T93v 
Hope that helps!
Best Regards, Dave

PS: Sorry nobody on this forum gave you this simple answer promptly, aaarrggg...

PPS: Beware of using C++ exceptions! Not thread-safe as distributed by ARM and NXP...

[frank_m]

> PS: Sorry nobody on this forum gave you this simple answer promptly, aaarrggg...

Oh yes, I did. Though sometimes, experience is the better teacher.

[misterbee]

Thank you @davenadler , I did as you suggested but I had this error after clean build:

Building target: lpcxpresso54114_freertos_hello.axf
Invoking: MCU C++ Linker
arm-none-eabi-c++ -nostdlib -L"C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\LPC54114\mcuxpresso" -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -o "lpcxpresso54114_freertos_hello.axf" ./utilities/fsl_assert.o ./utilities/fsl_debug_console.o ./utilities/fsl_str.o ./startup/boot_multicore_slave.o ./startup/startup_lpc5411x.o ./source/freertos_hello.o ./source/semihost_hardfault.o ./freertos/freertos_kernel/portable/MemMang/heap_4.o ./freertos/freertos_kernel/portable/GCC/ARM_CM4F/port.o ./freertos/freertos_kernel/croutine.o ./freertos/freertos_kernel/event_groups.o ./freertos/freertos_kernel/list.o ./freertos/freertos_kernel/queue.o ./freertos/freertos_kernel/stream_buffer.o ./freertos/freertos_kernel/tasks.o ./freertos/freertos_kernel/timers.o ./drivers/fsl_clock.o ./drivers/fsl_common.o ./drivers/fsl_flexcomm.o ./drivers/fsl_gpio.o ./drivers/fsl_reset.o ./drivers/fsl_usart.o ./device/system_LPC54114_cm4.o ./component/uart/fsl_adapter_usart.o ./component/serial_manager/fsl_component_serial_manager.o ./component/serial_manager/fsl_component_serial_port_uart.o ./component/lists/fsl_component_generic_list.o ./board/board.o ./board/clock_config.o ./board/pin_mux.o ./LPC54114/drivers/fsl_power.o -lpower_cm4_hardabi
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: warning: cannot find entry symbol _start; defaulting to 00008000
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./utilities/fsl_debug_console.o: in function `DbgConsole_Init':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_debug_console.c:821: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./utilities/fsl_debug_console.o: in function `DbgConsole_Printf':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_debug_console.c:975: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./utilities/fsl_debug_console.o: in function `DbgConsole_BlockingPrintf':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_debug_console.c:1021: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./utilities/fsl_str.o: in function `StrFormatPrintf':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:930: undefined reference to `strlen'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./utilities/fsl_str.o: in function `StrFormatScanfStringHandling':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1240: undefined reference to `strtoul'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1313: undefined reference to `errno'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./utilities/fsl_str.o: in function `StrFormatScanf':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1487: undefined reference to `strlen'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1491: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1494: undefined reference to `strtoul'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1506: undefined reference to `strtoul'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../utilities/fsl_str.c:1550: undefined reference to `errno'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./startup/startup_lpc5411x.o:C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../startup/startup_lpc5411x.c:240: undefined reference to `_vStackTop'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./startup/startup_lpc5411x.o: in function `ResetISR':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../startup/startup_lpc5411x.c:535: undefined reference to `__main'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../startup/startup_lpc5411x.c:535: undefined reference to `__data_section_table'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../startup/startup_lpc5411x.c:535: undefined reference to `__data_section_table_end'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../startup/startup_lpc5411x.c:535: undefined reference to `__bss_section_table_end'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/queue.o: in function `prvCopyDataToQueue':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/queue.c:2104: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/queue.c:2117: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/queue.o: in function `prvCopyDataFromQueue':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/queue.c:2168: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/stream_buffer.o: in function `vStreamBufferDelete':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:387: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/stream_buffer.o: in function `prvWriteBytesToBuffer':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:1103: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:1111: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/stream_buffer.o: in function `prvReadBytesFromBuffer':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:1154: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:1162: undefined reference to `memcpy'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/stream_buffer.o: in function `prvInitialiseNewStreamBuffer':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:1224: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/stream_buffer.c:1228: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./freertos/freertos_kernel/tasks.o: in function `prvInitialiseNewTask':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../freertos/freertos_kernel/tasks.c:854: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_clock.o: in function `CLOCK_SetFRGClock':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_clock.c:579: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_clock.o: in function `CLOCK_GetFrgClkFreq':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_clock.c:595: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_clock.o: in function `CLOCK_GetPllConfigInternal':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_clock.c:1201: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_clock.c:1201: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_clock.o: in function `CLOCK_GetSystemPLLOutFromSetup':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_clock.c:1400: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_common.o: in function `SDK_Malloc':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_common.c:152: undefined reference to `malloc'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_common.o: in function `SDK_Free':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_common.c:185: undefined reference to `free'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_common.o: in function `SDK_DelayAtLeastUs':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_common.c:275: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_usart.o: in function `USART_GetDefaultConfig':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_usart.c:307: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./drivers/fsl_usart.o: in function `USART_TransferCreateHandle':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../drivers/fsl_usart.c:685: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./device/system_LPC54114_cm4.o: in function `SystemCoreClockUpdate':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../device/system_LPC54114_cm4.c:345: undefined reference to `__aeabi_uldivmod'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./component/serial_manager/fsl_component_serial_manager.o: in function `SerialManager_Init':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../component/serial_manager/fsl_component_serial_manager.c:1092: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./component/serial_manager/fsl_component_serial_manager.o: in function `SerialManager_OpenWriteHandle':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../component/serial_manager/fsl_component_serial_manager.c:1309: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./component/serial_manager/fsl_component_serial_manager.o: in function `SerialManager_CloseWriteHandle':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../component/serial_manager/fsl_component_serial_manager.c:1347: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./component/serial_manager/fsl_component_serial_manager.o: in function `SerialManager_OpenReadHandle':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../component/serial_manager/fsl_component_serial_manager.c:1381: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: ./component/serial_manager/fsl_component_serial_manager.o: in function `SerialManager_CloseReadHandle':
C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\Debug/../component/serial_manager/fsl_component_serial_manager.c:1416: undefined reference to `memset'
c:/nxp/mcuxpressoide_11.5.1_7266/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.5.1.202201181444/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\iotlab0035\Documents\MCUXpressoIDE_11.5.1_7266\workspace\lpcxpresso54114_freertos_hello\LPC54114\mcuxpresso\libpower_cm4_hardabi.a(fsl_power_lib.o): in function `POWER_EnterDeepSleep':
D:/02-work/git repo/mcu-sdk-2.0/devices/LPC54114/fsl_power_lib/fsl_power_lib.c:423: undefined reference to `memcpy'
collect2.exe: error: ld returned 1 exit status
make[1]: *** [makefile:74: lpcxpresso54114_freertos_hello.axf] Error 1
make: *** [makefile:65: all] Error 2
"make -r -j8 all" terminated with exit code 2. Build might be incomplete.

09:59:35 Build Failed. 76 errors, 1 warnings. (took 1s.502ms)

[frank_m]

> I did as you suggested but I had this error after clean build: ...

> Invoking: MCU C++ Linker
> arm-none-eabi-c++ -nostdlib - ...

The missing symbols are in the stdlib. I would try adding "-lc".

[misterbee]

I am new to MCUXpresso, could you tell me where and how to add this 'lc'?

[frank_m]

This is more an Eclipse thing than a MCUXpresso thing.

Right-click on the project in the "Workspace" tab, select "Properties", and add it here:

And, you can play with this settings:

I don't use MCUXpresso very much, to be honest.

[GanesanGuru]

Hi @frank_m 

Can you explain it further - as I can't get it.Let'me explain where I'm stuck.

I've converted project into C/C++ like this and I checked MCU C++ Libraries for the include files/search paths, its completely empty as attached below img..

Also, the uploadd img is blury and hence can't understant which links to be added in Include path. Kindly, let me asap, as I'm stuck there..

[frank_m]

Sorry, but I can't help you with that.
I don't have much experience with converting projects from C to C++, which proved troublesome with all IDEs I ever worked with. And Eclipse especially.

Perhaps the author of the linked article could help you.
Mind you, it is already 3 years old, Eclipse/LPCXpresso versions have changed, and thus it might not be up to date anymore.

As a side note, NXP's email verification was a mess. It took me about a dozen attempts until the NXP verification mail arrived _before_ the link expired.

[misterbee]

Thanks @frank_m , unfortunately I still don't get it. What toolchain you use and recommend then ?

[frank_m]

For private projects, I use mostly Segger Embedded Studio now. Runs on Linux, and supports multiple vendors. At one point I got tired of installing another 1GB vendor-specific toolchain just for one board.

At work I use the stuff my company bought.

I recommend the tool you are familiar with, and that does the job.

[Alice_Yang]

Hello

Recommend you use declare this function as "extern C" as well. as Frank said.

[misterbee]

Hi @Alice_Yang ,

I did it but not helping.

Anyway, I decided to abandon using MCUXpresso IDE, was frustrated over this simple thing.

I used GNU Toolchains and it works well without changing the code side.

[misterbee]

From the build log, I  confirmed that the .cpp file was not even compiled. What should I do to include it into the build?

[misterbee]

It seems the issue is the .cpp file that I added was not automatically included in the build. So this .cpp was not even compiled and therefore linking error. Is there anything I should do to ensure this .cpp part of the build?

[frank_m]

First, I can see no need to declare the "App.cpp" source as C++, so renaming it to *.c would be the simplest solution.

Second, C++ implies name-mangling, which is required for the overloading feature of C++. My C++ is a bit rusty, but a solution is to declare this function as "extern C" as well.

But third, C++ cources and C projects don't work well together. Not only is the linking stage generally different, C++ requires and uses different startup code as well.

Better create a C++ project to begin with.

[misterbee]

Thanks @fra ,

1. I still need to declare as cpp as in there I plan to instantiate a class. I just made a simple example to demonstrate my intention.

2.  There is need to declare the function as extern "C" as this is already taken care by :

#ifdef __cplusplus
extern "C" {
#endif

#ifdef __cplusplus
}
#endif

3. C and C++ works together as historically C++ was continuity from C. And I know this can work as I use the same approach on another project before, using IAR on STM32 platform.

I still want to have C project, as I plan to write lower level code in C. But for application logic I plan to write in C++. There is gotta be a way.

[frank_m]

> 3. C and C++ works together as historically C++ was continuity from C. And I know this can work as I use the same approach on another project before, using IAR on STM32 platform.

But not both ways.

A C++ project can 'include' and deal with plain C files, but the reverse is not true. Some PC-based toolchains did support such an approach in a limited fashion, but no embedded toolchain I know of.

As mentioned, C++ requires special linker support and a special startup. Classes require constructors and destructors (check your startup code for CTOR and DTOR symbols ...).

Obviously, your toolchain does not even recognice files not named *.c/*.h in C mode.

As said, create a C++ project, and add your C files to that project.

[misterbee]

" but the reverse is not true"

Actually still true, I have been using this way on another project. Also, I used the same code in GNU arm toolchain and it works.

"As said, create a C++ project, and add your C files to that project"

This is not what I want. Also there is no SDK sample that I want in C++. It is all in C.

[shivangi_23]

Spoiler

So, Have you found any solution in using cpp files in c projects