* Add a blurb about __has_cpp_attribute and __has_attribute to gcc-5/changes.
@ 2015-01-27 5:44 Ed Smith-Rowland
2015-03-10 11:47 ` Markus Trippelsdorf
0 siblings, 1 reply; 3+ messages in thread
From: Ed Smith-Rowland @ 2015-01-27 5:44 UTC (permalink / raw)
To: Jason Merrill, Gerald Pfeifer, gcc-patches
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Gerald,
Could I get a hand on checking in this last addition?
-m 'Add a blurb to htdocs/gcc-5/changes.html to explain the
__has_cpp_attribute and
the equivalent __has_attribute macros.'
Thanks,
Ed
Sorry, I forgot to add gcc-patches.
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Index: htdocs/gcc-5/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-5/changes.html,v
retrieving revision 1.73
diff -r1.73 changes.html
186a187,206
> <li>A new built-in function to detect the existence of an attribute,
> <code>__has_attribute</code>, has been added. The equivalent built-in function
> <code>__has_cpp_attribute</code> was added to C++ to support
> <a href="http://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">
> Feature-testing recommendations for C++</a>. The function <code>__has_attribute</code>
> is added to all C-like functions as an extension:
> <blockquote><pre>
> int
> #ifdef __has_attribute
> # if __has_attribute(__noinline__)
> __attribute__((__noinline__))
> # endif
> #endif
> foo(int x);
> </pre></blockquote>
> If an attribute exists a nonzero constant integer is returned. Except for
> standardized C++ attributes that return dates the constant returned is 1.
> The has_attribute macros will add underscores to an attribute name if necessary
> to resolve the name. For C++11 and onwards the attribute may be scoped.
> </li>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Add a blurb about __has_cpp_attribute and __has_attribute to gcc-5/changes.
2015-01-27 5:44 Add a blurb about __has_cpp_attribute and __has_attribute to gcc-5/changes Ed Smith-Rowland
@ 2015-03-10 11:47 ` Markus Trippelsdorf
2015-03-10 12:01 ` Jakub Jelinek
0 siblings, 1 reply; 3+ messages in thread
From: Markus Trippelsdorf @ 2015-03-10 11:47 UTC (permalink / raw)
To: Ed Smith-Rowland; +Cc: Jason Merrill, Gerald Pfeifer, gcc-patches
On 2015.01.26 at 23:22 -0500, Ed Smith-Rowland wrote:
> Gerald,
>
> Could I get a hand on checking in this last addition?
>
> -m 'Add a blurb to htdocs/gcc-5/changes.html to explain the
> __has_cpp_attribute and
> the equivalent __has_attribute macros.'
>
> Thanks,
Ping?
And maybe add a word about the macro behavior in plain C sources,
see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65377 ?
--
Markus
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Add a blurb about __has_cpp_attribute and __has_attribute to gcc-5/changes.
2015-03-10 11:47 ` Markus Trippelsdorf
@ 2015-03-10 12:01 ` Jakub Jelinek
0 siblings, 0 replies; 3+ messages in thread
From: Jakub Jelinek @ 2015-03-10 12:01 UTC (permalink / raw)
To: Markus Trippelsdorf
Cc: Ed Smith-Rowland, Jason Merrill, Gerald Pfeifer, gcc-patches
On Tue, Mar 10, 2015 at 12:47:54PM +0100, Markus Trippelsdorf wrote:
> On 2015.01.26 at 23:22 -0500, Ed Smith-Rowland wrote:
> > Gerald,
> >
> > Could I get a hand on checking in this last addition?
> >
> > -m 'Add a blurb to htdocs/gcc-5/changes.html to explain the
> > __has_cpp_attribute and
> > the equivalent __has_attribute macros.'
> >
> > Thanks,
>
> Ping?
>
> And maybe add a word about the macro behavior in plain C sources,
> see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65377 ?
> <li>A new built-in function to detect the existence of an attribute,
> <code>__has_attribute</code>, has been added. The equivalent
> built-in function
__has_attribute and __has_cpp_attribute are not a built-in functions, but
built-in function-like macros.
BTW, unlike clang++ we perform macro replacements in the argument, the spec
is unclear and I believe it is useful to be able to e.g. do
#ifdef __clang__
#define NS clang::
#elif defined __GNUC__
#define NS gnu::
#endif
#if defined (NS) && defined (__has_cpp_attribute)
#if __has_cpp_attribute (NS noreturn)
...
#endif
#endif
etc.
Jakub
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2015-01-27 5:44 Add a blurb about __has_cpp_attribute and __has_attribute to gcc-5/changes Ed Smith-Rowland
2015-03-10 11:47 ` Markus Trippelsdorf
2015-03-10 12:01 ` Jakub Jelinek
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