[RFH] Uses of output.h in the front ends

[Eric Botcazou]

> The code for the case in Ada is this:
>
>   /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't
>      try to fiddle with DECL_COMMON.  However, on platforms that don't
>      support global BSS sections, uninitialized global variables would
>      go in DATA instead, thus increasing the size of the executable.  */
>   if (!flag_no_common
>       && TREE_CODE (var_decl) == VAR_DECL
>       && TREE_PUBLIC (var_decl)
>       && !have_global_bss_p ())
>     DECL_COMMON (var_decl) = 1;
>
> That does look like premature optimization to me, but I don't really
> understand the comment, or the effect of this code. Eric, could you
> please have a look at this and help me out?

Sure, but I don't understand what you don't understand...  the comment seems 
clear enough to me: DECL_COMMON is needed on some platforms if you don't want 
uninitialized variables to go in DATA.

-- 
Eric Botcazou