getenv undefined reference

[Richix]

Hello,

I am trying to use lua script language on nrf52840 board using SES to compile and load code.

I already compiled and load some ble tutorials on nrf52840 and it works nicely.

My problem now is that I am trying to install lua script on the nrf kit.

I get the following error from gcc compiler concerning getenv() function that is  in standard library stdlib that

I included in my code:

1> C:/Program Files (x86)/SEGGER/SEGGER Embedded Studio for ARM 4.52c/gcc/arm-none-eabi/bin/ld: Output/ble_app_uart_pca10056_s140 Release/Obj/main.o: in function `main':
1> C:\BLE Projects\nRF515\examples\ble_peripheral\ble_app_uart/main.c:736: undefined reference to `getenv'

Please could you give some info on how to overcome this error or/and what is the best way to install lua script on nrf52840 board with segger.

Thank you in advance,

Best regards.

[haakonsh]

I'm not familiar with getnv, but from its description in https://www.tutorialspoint.com/c_standard_library/c_function_getenv.htm it sounds like a system call to an OS with a file system. 

I doubt there's an implementation in the c libraries for arm embedded devices(gnuarmemb - https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm) for cortex-m family devices. 

[Richix]

OK thank you for your reply.

Would it be possible to use equivalent funtion such as getenv (or library) on embedded system like the nrf kit?

[haakonsh]

getenv does not make any sense on any platform without an os and a file system. Why are you interrested in geting the path to an environmental variable? 

[Richix]

OK, Indeed I am not si familiar with such environment function. I want to use lua script on the nrf52840 development kit. I imported the library of this script on the nrf52840. One module of the lua script use the getenv, therfore I get the error shwon  in my first message. Do you have some experience at nordic for the embedding of lua script (and not eLua) in nrf52840 platform?

[haakonsh]

We have no support for Lua. 

What is it that the Lua library is trying to do with the getenv function though?