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Re: new __strtol warning

On Thu, 13 Nov 2014, Roland McGrath wrote:

> Perhaps we should start adding -Werror=foo for certain warnings, and
> -Werror=strict-prototypes is a fairly obvious safe candidate.

Using plain -Werror seems better than enabling it for particular warnings 
only - we just need an appropriate policy on selective disabling of 

> 2. Change the definition to be a prototype.  This is a transformation we
>    have been generically doing, so it doesn't hurt.  I'm not sure what our
>    current scheme is for ensuring there is a prior declaration for every
>    non-static function when the definition uses a prototype so that
>    -Wstrict-prototypes doesn't catch it.  Nothing we have more automated
>    than human eyeballs will catch useless extra symbol names this way.

I've committed this patch that fixes those warnings by using a prototype 
definition for __strtol.

Tested for x86_64 that stripped installed shared libraries are
unchanged by this patch.

> 3. Rework your change so that it does not use the name __strtol at all,
>    while still using __strtoull et al.  This is the ideal solution for this
>    case, because strtol is a C89 function and so __strtol will never be
>    used anywhere.  It's always nice to clean the symbol table of useless
>    symbols and have the DWARF data use the canonical name for a function.

That seemed an excessive complication (as the extra name is harmless and 
simplifies the code).

2014-11-13  Joseph Myers  <>

	* stdlib/strtol.c (__strtol): Use prototype definition.

diff --git a/stdlib/strtol.c b/stdlib/strtol.c
index bd59180..60a33c0 100644
--- a/stdlib/strtol.c
+++ b/stdlib/strtol.c
@@ -104,10 +104,7 @@ libc_hidden_def (INTERNAL (strtol))
-__strtol (nptr, endptr, base)
-     const STRING_TYPE *nptr;
-     STRING_TYPE **endptr;
-     int base;
+__strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr, int base)
   return INTERNAL (__strtol_l) (nptr, endptr, base, 0, _NL_CURRENT_LOCALE);

Joseph S. Myers

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