Re: [Minios-devel] [Unikraft] Undefined reference error when adding code in stdlib.c

[Wei Chen <Wei.Chen@xxxxxxx>]

Hi Ajay,

> -----Original Message-----
> From: Minios-devel <minios-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Ajay Garg
> Sent: 2018年5月16日 12:20
> To: minios-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: [Minios-devel] [Unikraft] Undefined reference error when adding code
> in stdlib.c
>
> Hi All.
>
> I added the following code in unikraft/lib/nolibc/stdlib.c
>
> #####################################################
> #include <uk/plat/time.h>
> #include <sys/time.h>
>
>
> #define ONE_BILLION   1000000000
> void clock_gettime(struct timespec *t)
> {
>     long nanoseconds = ukplat_monotonic_clock();
>
>     t->tv_sec = nanoseconds /  ONE_BILLION;
>     t->tv_nsec = nanoseconds % ONE_BILLION;
> }
> #####################################################
>
>
>
> Now, after I do make, I get the following error :
>
> #####################################################
> /home/ajay/unikraft/apps/helloworld/build/libnolibc.o: In function
> `clock_gettime':
> (.text+0x16cd): undefined reference to `ukplat_monotonic_clock'
> /home/ajay/unikraft/unikraft/plat/linuxu/Linker.uk:9: recipe for
> target '/home/ajay/unikraft/apps/helloworld/build/helloworld_linuxu-x86_64'
> failed
> make[2]: *** [/home/ajay/unikraft/apps/helloworld/build/helloworld_linuxu-
> x86_64]
> Error 1
> #####################################################
>
>
>
> Seems that nolibc does not reference platform-specific code.
> If so, what is the correct procedure to add this function, which can
> be called generically, but uses a platform-specific API to get the
> final result?
>
>

"ukplat_monotonic_clock" belongs to Unikraft core library.
You can find it in Costin's patch:
"[Minios-devel] [UNIKRAFT PATCH 3/3] plat/kvm: Add KVM (x86_64) timer support"
https://lists.xenproject.org/archives/html/minios-devel/2018-04/msg00076.html


> Thanks and Regards,
> Ajay
>
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