Skip site navigation (1)Skip section navigation (2) 
Date:      Tue, 5 Sep 1995 17:22:46 -0700 (PDT)
From:      Archie Cobbs <archie@tribe.com>
To:        questions@freebsd.org
Cc:        archie@tribe.com
Subject:   multiple variable definitions in object files
Message-ID:  <199509060022.RAA10570@bubba.tribe.com>
next in thread | raw e-mail | index | archive | help 

Hello,

Can someone explain why the linker allows multiple definitions of
a variable to be linked together without complaining or warning?

I found this surprising... I thought this was a no-no. At least it
has always caused errors in the past it seems.

I didn't see any relevant info in the ld(1) man page.

For example:

======== foo.c ============

    int global;

    main()
    {
     global = 2;
     printf("foo: global = %d\n", global);
     bar();
    }

======== bar.c ============

    float global;

    bar()
    {
     printf("bar: global = %f\n", global);
    }

======== compile with ==========

    $ cc -o foobar foo.c bar.c
    $ foobar
    foo: global = 2
    bar: global = 0.000000
    $


Thanks for any insight,
-Archie

_______________________________________________________________________________
Archie L. Cobbs, archie@tribe.com  *  Tribe Computer Works http://www.tribe.com

Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199509060022.RAA10570>