Remove C++ style comments from string3.h

  The new check-installed-headers rule check now complains with C++
comment from string3.h with:

../string/bits/string3.h:129:1: error: C++ style comments are not allowed in ISO C90
 // XXX We have no corresponding builtin yet.

Let use old C style comment to make compiler happy in old modes.

Tested on x86_64.

	* string/bits/string3.h: Remove C++ style comments.
---
 ChangeLog             | 4 ++++
 string/bits/string3.h | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)
  

On Thursday 29 September 2016 02:12 PM, Adhemerval Zanella wrote:
> The new check-installed-headers rule check now complains with C++
> comment from string3.h with:
> 
> ../string/bits/string3.h:129:1: error: C++ style comments are not allowed in ISO C90
>  // XXX We have no corresponding builtin yet.
> 
> Let use old C style comment to make compiler happy in old modes.
> 
> Tested on x86_64.
> 
> 	* string/bits/string3.h: Remove C++ style comments.

LGTM.

Siddhesh
  

* Adhemerval Zanella:

> -// XXX We have no corresponding builtin yet.
> +/* XXX We have no corresponding builtin yet.  */
>  extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
>  			    size_t __destlen) __THROW;
>  extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,

I think the comment is outdated, because such a builtin exists now:

/tmp/t.c:3:22: note: expected ‘char *’ but argument is of type ‘int’
/tmp/t.c:3:25: warning: passing argument 2 of ‘__builtin_stpncpy’ makes pointer from integer without a cast
   __builtin_stpncpy (1, 2, 3);
                         ^
This is with gcc version 4.9.2 (Debian 4.9.2-10).

Perhaps remove it and file a bug to clean this up?
  

On 30/09/2016 03:17, Florian Weimer wrote:
> * Adhemerval Zanella:
> 
>> -// XXX We have no corresponding builtin yet.
>> +/* XXX We have no corresponding builtin yet.  */
>>  extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
>>  			    size_t __destlen) __THROW;
>>  extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
> 
> I think the comment is outdated, because such a builtin exists now:
> 
> /tmp/t.c:3:22: note: expected ‘char *’ but argument is of type ‘int’
> /tmp/t.c:3:25: warning: passing argument 2 of ‘__builtin_stpncpy’ makes pointer from integer without a cast
>    __builtin_stpncpy (1, 2, 3);
>                          ^
> This is with gcc version 4.9.2 (Debian 4.9.2-10).
> 
> Perhaps remove it and file a bug to clean this up?
> 

Good catch, bug report created [1].  I will work on it.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=20661