undefined reference to `gettimeofday' on ncs v2.5.2

Question

I would like to test the following function on nRF52832 MDK. But west build failed. 
 uint32_t randGen(void) {
 uint32_t num = 0;
 srand(time(NULL));
 const int x = rand();
 if (x > DATA_MAX) {
 num = DATA_MAX;
 } else {
 num = (uint32_t) x;
 }

return num;
} 
 
 The following are west build error messages. 
 C:
cs\v2.5.2
rf\samples\caf_time_52832>west build -b nrf52832_mdk
[174/179] Linking C executable zephyr\zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map
arm-zephyr-eabi/lib/thumb/v7e-m/nofp\libc.a(libc_time_time.c.o): in function `time':
time.c:(.text.time+0x8): undefined reference to `gettimeofday'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed. 
 
 Procedures to reproduce this issue are as follows. 
 1. Unzipping caf_time_52832.zip to C:
cs\v2.5.2
rf\samples folder. 
 2. cd C:
cs\v2.5.2
rf\samples\caf_time_52832 3. west build -b nrf52832_mdk

Menon · Accepted Answer

Hello, 
 It is not a good idea to go through your whole code. The error message from the log says that it is not possible to find the gettimeofday function during the build process. Have you enabled the configuration for the POSIX API? See the config CONFIG_POSIX_API . You might also need to enable CONFIG_COMMON_LIBC_TIME when using the time function; see this page . 
 Please expect some delay after this response, as it is Easter vacation here in Norway. 
 
 Kind Regards, 
 Abhijith

undefined reference to `gettimeofday' on ncs v2.5.2

Top Replies