Patch to allow strlen expander to fail

[Clinton Popetz]

On Tue, Mar 07, 2000 at 05:20:51PM -0500, Phil Edwards wrote:
 
> #  `-fhosted'
> #       Assert that compilation takes place in a hosted environment.  This
> #       implies `-fbuiltin'.  A hosted environment is one in which the
> #       entire standard library is available, and in which `main' has a
> #       return type of `int'.  Examples are nearly everything except a
> #       kernel.  This is equivalent to `-fno-freestanding'.
> #  
> #  `-ffreestanding'
> #       Assert that compilation takes place in a freestanding environment.
> #       This implies `-fno-builtin'.  A freestanding environment is one
> #       in which the standard library may not exist, and program startup
> #       may not necessarily be at `main'.  The most obvious example is an
> #       OS kernel.  This is equivalent to `-fno-hosted'.
> 
> I couldn't tell you how those switches get used in the source, or what
> they currently affect.

Except for setting -fbuiltin appropriately, they have no effect currently.  
(They set flag_hosted in c-decl.c, but nothing uses that flag.)

They were added here:

Sun Jan 19 15:05:42 1997  Peter Seebach  <seebs@solon.com>

        * c-decl.c (start_decl): Add code for -Wmain.
        (c_decode_option): Add -fhosted, -ffreestanding, and -Wmain.
        * toplev.c (lang_options): Likewise.
        * c-tree.h (warn_main, flag_hosted): New variables.


but never touched afterward.

					-Clint