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Re: Removing -frwitable-strings
On Thu, 2003-12-18 at 12:37, Joe Buck wrote:
> On Thu, Dec 18, 2003 at 11:02:06AM -0800, Mark Mitchell wrote:
> > On Thu, 2003-12-18 at 10:57, Jamie Lokier wrote:
> > > Someone said that -fwritable-strings could be implemented in the front
> > > end, but currently it isn't and that adds unwanted code to
> > > the back end.
> > >
> > > Perhaps it's quite a simple change to make string constants have type
> > > "char[]" in the C and C++ front ends instead of "const char[]"? (No,
> > > I'm not volunteering).
> >
> > It ain't that easy, sadly.
>
> It would seem that the front end would need to generate a static
> char[] array for each literal string, and use its address as the value
> of the literal string expression. If that were done, the back end could
> eliminate its support for -fwritable-strings.
Yes.
But, even that will not work because there are places in the front ends
that expect string constants to be STRING_CSTs.
It's possible that the conversion you suggest could be done at tree->rtl
conversion time. That is the approach I would try if I had to implement
it.
--
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC