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Re: [C++ PATCH] Fix option handling when -std=gnu++14 is not used (PR 69865)
- From: Bernd Edlinger <bernd dot edlinger at hotmail dot de>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, Jason Merrill <jason at redhat dot com>, Jonathan Wakely <jwakely at redhat dot com>
- Date: Fri, 19 Feb 2016 13:07:52 +0000
- Subject: Re: [C++ PATCH] Fix option handling when -std=gnu++14 is not used (PR 69865)
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On 19.02.2016 13:22, Jakub Jelinek wrote:
> Hi!
>
> On Fri, Feb 19, 2016 at 12:59:45PM +0100, Jakub Jelinek wrote:
>> Of course not, and that would be the wrong thing to do.
>> The definition spot of libc_name_p comes from gperf itself, the prototype
>> from cfns.gperf, which we can of course adjust.
>
> This is related to
> https://gcc.gnu.org/ml/gcc-patches/2015-08/msg00375.html
> But, as we use it in a header, in C++ and don't provide an out of line
> definition for it, we really don't want the gnu_inline attribute in this
> case, because unlike in C, where gnu_inline attribute has one meaning when
> applied to inline and another when applied to extern inline, in C++
> it always means the extern inline GNU inline semantics. And gperf clearly
> wants the C inline __attribute__((gnu_inline)) semantics.
> IMHO gperf should be fixed to only use __attribute__((gnu_inline)) for C++.
>
> BTW, the prototypes aren't really needed anymore in cfns.gperf, we use it
> in C++ only and C++ doesn't have -Wstrict-prototypes -Wmissing-prototypes.
>
> So, for cfns.* I think we should use until gperf is fixed:
>
Yeah, that is ugly, but we don't have any alternatives.
So please commit then I can continue with my new patch.
Thanks
Bernd.
> 2016-02-19 Jakub Jelinek <jakub@redhat.com>
>
> * cfns.gperf: Remove prototypes for hash and libc_name_p
> inlines. Undefine __GNUC_STDC_INLINE__ and
> __GNUC_GNU_INLINE__ for C++.
> * cfns.h: Regenerated.
>
> --- gcc/cp/cfns.gperf.jj 2016-01-04 14:55:57.000000000 +0100
> +++ gcc/cp/cfns.gperf 2016-02-19 13:16:50.374311181 +0100
> @@ -16,14 +16,13 @@ for more details.
> You should have received a copy of the GNU General Public License
> along with GCC; see the file COPYING3. If not see
> <http://www.gnu.org/licenses/>. */
> -#ifdef __GNUC__
> -__inline
> +
> +/* Don't use gnu_inline attribute that gperf 3.0.3 and later emits
> + for C++. */
> +#if defined(__cplusplus) && defined(__GNUC__)
> +# undef __GNUC_STDC_INLINE__
> +# undef __GNUC_GNU_INLINE__
> #endif
> -static unsigned int hash (const char *, unsigned int);
> -#ifdef __GNUC__
> -__inline
> -#endif
> -const char * libc_name_p (const char *, unsigned int);
> %}
> %%
> # The standard C library functions, for feeding to gperf; the result is used
> --- gcc/cp/cfns.h.jj 2016-01-04 14:55:57.000000000 +0100
> +++ gcc/cp/cfns.h 2016-02-19 13:17:02.458142071 +0100
> @@ -1,4 +1,4 @@
> -/* ANSI-C code produced by gperf version 3.0.3 */
> +/* ANSI-C code produced by gperf version 3.0.4 */
> /* Command-line: gperf -o -C -E -k '1-6,$' -j1 -D -N libc_name_p -L ANSI-C cfns.gperf */
>
> #if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
> @@ -47,14 +47,13 @@ for more details.
> You should have received a copy of the GNU General Public License
> along with GCC; see the file COPYING3. If not see
> <http://www.gnu.org/licenses/>. */
> -#ifdef __GNUC__
> -__inline
> -#endif
> -static unsigned int hash (const char *, unsigned int);
> -#ifdef __GNUC__
> -__inline
> +
> +/* Don't use gnu_inline attribute that gperf 3.0.3 and later emits
> + for C++. */
> +#if defined(__cplusplus) && defined(__GNUC__)
> +# undef __GNUC_STDC_INLINE__
> +# undef __GNUC_GNU_INLINE__
> #endif
> -const char * libc_name_p (const char *, unsigned int);
> /* maximum key range = 391, duplicates = 0 */
>
> #ifdef __GNUC__
> @@ -124,7 +123,7 @@ hash (register const char *str, register
>
> #ifdef __GNUC__
> __inline
> -#ifdef __GNUC_STDC_INLINE__
> +#if defined __GNUC_STDC_INLINE__ || defined __GNUC_GNU_INLINE__
> __attribute__ ((__gnu_inline__))
> #endif
> #endif
>
> Jakub
>