[gcc r15-10522] docs: Fix __builtin_object_size example [PR121581]

[Andrew Pinski]

https://gcc.gnu.org/g:5f28f7cea440e578014e1a7afc7f92b36f55a871

commit r15-10522-g5f28f7cea440e578014e1a7afc7f92b36f55a871
Author: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
Date:   Mon Aug 18 12:00:45 2025 -0700

    docs: Fix __builtin_object_size example [PR121581]
    
    This example used to work (with C) in GCC 14 before the
    warning for different pointer types without a cast was changed
    to an error.
    The fix is to make the q variable `int*` rather than the current `char*`.
    This also fixes the example for C++ too.
    
    Pushed as obvious after doing a `make html`.
    
            PR middle-end/121581
    gcc/ChangeLog:
    
            * doc/extend.texi (__builtin_object_size): Fix example.
    
    Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
    (cherry picked from commit 2be801a805c6cca08aaa33fd387dcc7bd4fe8aac)

Diff:
---
 gcc/doc/extend.texi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index f45927a908ad..570e89a04afe 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -16971,7 +16971,8 @@ is computed.
 
 @smallexample
 struct V @{ char buf1[10]; int b; char buf2[10]; @} var;
-char *p = &var.buf1[1], *q = &var.b;
+char *p = &var.buf1[1];
+int *q = &var.b;
 
 /* Here the object p points to is var.  */
 assert (__builtin_object_size (p, 0) == sizeof (var) - 1);