Hello.
In the code below I want to test the outcome of the function reset(). I
do that simply by printf'ing _foo in main().
The compilation seems to go fine ('cc -c filename.c') but when using 'cc
-o filename filename.o' I get the following error messages in Cygwin GCC
(version 3.3.1):
testReset.o<.text+0x35>:testReset.c: undefined reference to '_LPT'
testReset.o<.text+0x3e>:testReset.c: undefined reference to '_foo'
collect2: ld returned 1 exit status
No matter whether I declare and/or define _foo within or outside main()
/ define _LPT in a header filer or not I still get the error. I would be
grateful if someone can clarify the error messages given. Thanks in
advance. :)
Yours,
Jack
#include <stdio.h>
#define _LPT 0x378
int _foo;
void reset()
{
__asm__ (
"movw _LPT+2, %dx\n\t"
"inb %dx, %al\n\t"
"orb $0x1, %al\n\t"
"outb %al, %dx\n\t"
"movb _foo, %al"
);
}
int main(int argc, char **argv)
{
reset();
printf("foo: %d", _foo);
exit(0);
}
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