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List:       linux-ppc
Subject:    Compile problems
From:       Adam Dershowitz <dersh () houston ! rr ! com>
Date:       2000-07-10 2:17:31
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I have been trying to compile some c code and running into problems.   I
finally reduced the problem to how
external variables are being handled.  I am using gcc 2.95.2-1g
I tried creating two files, then compiling them:

Here is test1.c

#include <stdio.h>
extern int a;
main()
{

printf("Hello world\n");
a=2;
testfun();
a=4;
testfun();
}

And here is test2.c
extern int a;
testfun()
{
printf("Now got into testfun\n");
printf("a = %i\n",a);
}

At the command line I type> gcc test1.c test2.c
and I get the following list of errors:
/tmp/cca2PpML.o: In function `main':
/tmp/cca2PpML.o(.text+0x26): undefined reference to `a'
/tmp/cca2PpML.o(.text+0x2e): undefined reference to `a'
/tmp/cca2PpML.o(.text+0x36): undefined reference to `a'
/tmp/cca2PpML.o(.text+0x3e): undefined reference to `a'
/tmp/ccvyFtQG.o: In function `testfun':
/tmp/ccvyFtQG.o(.text+0x26): undefined reference to `a'
/tmp/ccvyFtQG.o(.text+0x32): more undefined references to `a' follow
collect2: ld returned 1 exit status

Am I missing something really obvious?  Is there a bug in gcc?  Any help
would be greatly appreciated.

--Adam


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