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Re: [Tinycc-devel] _Generic or __builtin_choose_expr
From: |
Michael Matz |
Subject: |
Re: [Tinycc-devel] _Generic or __builtin_choose_expr |
Date: |
Tue, 4 Jul 2017 16:27:39 +0200 (CEST) |
User-agent: |
Alpine 2.20 (LSU 67 2015-01-07) |
Hi,
On Tue, 4 Jul 2017, grischka wrote:
> Michael Matz wrote:
> > First string literals are now always const char, ...
>
> Hm... ;)
>
> Actually the behavior with -Wwrite-strings that we had is what
> gcc has too:
>
> typeof("123") cc = "456";
> cc[1] = 'x';
> printf("%s\n", cc);
>
> $ gcc -Wno-write-strings ...
> 4x6
> $ gcc -Wwrite-strings ...
> error: assignment of read-only location 'cc[1]'
Ugh, you're right. Indeed the standard doesn't mandate a const char[]
type for string literals (I was confused because it does say that
modification of string literals is undefined, i.e. that's an extension).
Let me work on this a bit.
> (mingw gcc 3.4.2 and 6.3.0)
>
> Also, now tcc doesn't warn with this one anymore:
> const char cc[] = "456";
> char *p = cc;
Yeah, that was conscious on my part but still under the influence of the
above confusion ;-)
Ciao,
Michael.
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/03
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, Michael Matz, 2017/07/03
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, grischka, 2017/07/04
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr,
Michael Matz <=
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, Michael Matz, 2017/07/04
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/04
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/04
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/04
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, Michael Matz, 2017/07/05
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/05
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, Christian Jullien, 2017/07/06
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/06
- Re: [Tinycc-devel] _Generic or __builtin_choose_expr, uso ewin, 2017/07/06