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

Yusuke MATSUOKA yusuke@ee.ucla.edu
Thu Nov 20 21:47:00 GMT 2003

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  
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
collect2: ld returned 1 exit status

My code is quite simple:
#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?


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