Re: [ECOS] how to link "gettimeofday" with arm-elf-gcc?

[Gary Thomas <gary@mlbassoc.com>]

On Thu, 2003-11-20 at 14:47, Yusuke MATSUOKA wrote:
> Hi all,
> I just wanna know how to link gettimeofday with arm-elf-gcc.
> 
> I'm trying to compile a simple program on Cygwin,
> with arm-elf-gcc which is downloaded and installed via ecos-install.tcl
> provided at ecos site.
> 
> I think I have built libraries for SA1110 successfuly, such as:
> bash-2.05b$ pwd  
> /home/yusuke/SA1110_new/sa1110_install/lib
> bash-2.05b$ ll
> total 8974
> drwxrwxrwx+   2 yusuke   None            0 Nov 19 15:17 ./
> drwxrwxrwx+   5 yusuke   None            0 Oct 23 15:43 ../
> -rw-rw-rw-    1 yusuke   None       390748 Oct 23 15:32 extras.o
> -rw-rw-rw-    1 yusuke   None       402954 Oct 23 15:32 libextras.a
> -rw-rw-rw-    1 yusuke   None      8381312 Oct 23 15:32 libtarget.a
> -rw-rw-rw-    1 yusuke   None         2156 Oct 23 15:32 target.ld
> -rw-rw-rw-    1 yusuke   None         9236 Oct 23 15:32 vectors.o
> 
> However, when I compile as follows,
> arm-elf-gcc.exe  -g -I/home/yusuke/SA1110_new/sa1110_install/include \
> -L/opt/ecos/gnutools/arm-elf/lib/gcc-lib/arm-elf/3.2.1 \
> -L/home/yusuke/SA1110_new/sa1110_install/lib -Ttarget.ld \
> -nostdlib hello.c
> 
> 
> I got an error that linker cannot find "gettimeofday" as follows:
> bash-2.05b$ make.csh
> /ecos-c/DOCUME~1/yusuke/LOCALS~1/Temp/ccgyG7X0.o: In function `main':
> /home/yusuke/SA1110_new/Hello/hello.c:12: undefined reference to
> `gettimeofday'
> collect2: ld returned 1 exit status
> 
> 
> My code is quite simple:
> #include<stdio.h>
> #include <sys/time.h>
> 
> int main() 
> {
>   printf ("\n");
>   printf (" Hello World !!\n");
>   printf (" You are running this on the SA-1110\n");
>   printf ("\n");
> 
>   struct timeval tv;
>   gettimeofday(&tv, NULL) ;
>   printf("%ld %ld\n", tv.tv_sec, tv.tv_usec);
> 
>   return (0);
> }
> 
> 
> Can anybody help me, please?
> 

The 'gettimeofday()' function is not normally available in eCos,
because few platforms which run eCos have any notion of absolute time.

Besides the obvious (printing a time/date in your example), why
do you need it?  

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


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