How to use time.h and math.h in nrf connect sdk?

[Krumita]

1)I want to use "mktime" and "localtime" in my nrf52840 code ,how do i include time.h file?

2)I am using math.h file , in prj.conf i define "CONFIG_NEWLIB_LIBC=y"  but I continuously  get error as below ,how do i resolve it?

error:

/usr/include/math.h:415:33: error: '_Float128' is not supported on this target

415 | # define _Mdouble_ _Float128

[Krumita]

No, you are going wrong

/usr/include  its a system library, basic files which are used.


1) In sdk v2.3.0 file as below 
/ncs/v2.3.0/modules/lib/hostap/src/utils/os_zephyr.c

In function

int os_mktime(int year, int month, int day, int hour, int min, int sec,

os_time_t *t)

using 

mktime and localtime  using this function where i can find its definition.

can you give me exact path?


2)In file as below
ncs/v2.3.0/nrf/include/net/nrf_cloud_alerts.h

included math.h file

from where it is called( from which path).?


3) in first example you give me sample code with gmtime , i want with mktime ,can you give me with it.

[Naeem Maroof]

Hello Kumrita,

I am still not very sure that I understood you 100%, but here is what I have now.

Previously, I did not pay attention to the newlib_libc config.

So now, after having proper configs, I can use the mktime and localtime.

The catch is that we need to compile project first with these configs so that old files are not pulled and we could use the functions from the newlib. 

Before compilation: can not use mktime

After compilation: can use mktime and localtime

Showing successful compilation with time.h and math.h

BR, Naeem

[Krumita]

Thank you, this is what i want, my issue is resolved with this.