Re: pb compiling with gcc-2.7.2.3-3

[Eric Delaunay <delaunay@lix.polytechnique.fr>]

Eric Delaunay wrote:
> I've tracked the problem down to the following source I cannot compile:
> -------cut here--------
> #include <stdio.h>
> FILE *out = stdout;
> main()
> {
>   fprintf( out, "hello\n" );
> }
> -------cut here--------
> 
> $ gcc toto.c
> toto.c:2: initializer element is not constant

I think I discovered the problem:
 .stdout is only declared, in stdio.h (from libc6), as
    extern FILE* stdout

 .in libc5, it was declared like this:
    /* stdio.h */
    #define stdout _IO_stdout
    /* libio.h */
    extern struct _IO_FILE_plus _IO_stdout_;
    #define _IO_stdout ((_IO_FILE*)(&_IO_stdout_))

 .the latter declaration is resolved to the address of a global structure at
  compile time, so results in a constant, but the former is only a pointer
  whose contents is unknown at compile time.

Such constructs have now be rewritten like that:
-------cut here--------
#include <stdio.h>
FILE *out;
main()
{
  out = stdout;
  fprintf( out, "hello\n" );
}
-------cut here--------

Bye.

-- 
 Eric Delaunay                 | "La guerre justifie l'existence des militaires.
 delaunay@lix.polytechnique.fr | En les supprimant." Henri Jeanson (1900-1970)


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