Re: [Qemu-devel] [PATCH, RFC] ld flag --warn-common

["Blue Swirl" <blauwirbel@gmail.com>]

On 9/19/08, Kirill A. Shutemov <kirill@shutemov.name> wrote:
> On Sun, Sep 07, 2008 at 11:24:37AM +0300, Blue Swirl wrote:
>  > Hi,
>  >
>  > These trivial patches enable linker flag --warn-common and fix the
>  > warnings caused by enabling the flag.
>
>
> This flag cause a lot of warning on my machine, even with trivial program.
>
>  $ cat 1.c
>  #include <stdio.h>
>
>  int main()
>  {
>         printf("test\n");
>         return 0;
>  }
>  $ gcc -Wl,--warn-common -static 1.c
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtoul.o): warning: multiple common of `_nl_category_name_idxs'
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtol.o): warning: previous common is here
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtol_l.o): warning: multiple common of `_nl_category_name_idxs'
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtol.o): warning: previous common is here
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtoul_l.o): warning: multiple common of `_nl_category_name_idxs'
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtol.o): warning: previous common is here
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(vfprintf.o): warning: multiple common of `_nl_category_name_idxs'
>  /usr/lib64/gcc/x86_64-alt-linux/4.1.2/../../../../lib64/libc.a(strtol.o): warning: previous common is here
>
>  ...and so on.
>
>
>  Is it problem with my toolchain? What is your testing environment?

I get no warnings for Qemu build on Debian i386, amd64
(stable/unstable), Sparc32, Sparc64 or on OpenBSD/Sparc64. Your
program produces one warning on Debian stable (all hosts except no
warnings on arm), no warnings on Debian amd64 unstable or OpenBSD.