* [C++ docs patch] PR 56544
@ 2013-06-08 8:57 Paolo Carlini
2013-06-18 10:07 ` PING " Paolo Carlini
0 siblings, 1 reply; 3+ messages in thread
From: Paolo Carlini @ 2013-06-08 8:57 UTC (permalink / raw)
To: gcc-patches; +Cc: Jason Merrill
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Hi,
the bug reminds us to update the documentation about the value of
__cplusplus. I tentatively prepared the below, is it clear enough?
We could probably apply something to the branch too, without the
-std=c++1y bits, thus end simply like '; or @code{201103L}, per the 2011
C++ standard' or more verbosely say that with -std=c++1y too the value
is 201103L.
Thanks,
Paolo.
///////////////////
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Index: doc/cpp.texi
===================================================================
--- doc/cpp.texi (revision 199792)
+++ doc/cpp.texi (working copy)
@@ -1926,11 +1926,11 @@ facilities of the standard C library available.
This macro is defined when the C++ compiler is in use. You can use
@code{__cplusplus} to test whether a header is compiled by a C compiler
or a C++ compiler. This macro is similar to @code{__STDC_VERSION__}, in
-that it expands to a version number. A fully conforming implementation
-of the 1998 C++ standard will define this macro to @code{199711L}. The
-GNU C++ compiler is not yet fully conforming, so it uses @code{1}
-instead. It is hoped to complete the implementation of standard C++
-in the near future.
+that it expands to a version number. Depending on the language standard
+selected, the value of the macro is @code{199711L}, as mandated by the
+1998 C++ standard; @code{201103L}, per the 2011 C++ standard; an
+unspecified value strictly larger than @code{201103L} for the experimental
+languages enabled by @option{-std=c++1y} and @option{-std=gnu++1y}.
@item __OBJC__
This macro is defined, with value 1, when the Objective-C compiler is in
^ permalink raw reply [flat|nested] 3+ messages in thread
* PING [C++ docs patch] PR 56544
2013-06-08 8:57 [C++ docs patch] PR 56544 Paolo Carlini
@ 2013-06-18 10:07 ` Paolo Carlini
2013-06-19 9:04 ` Paolo Carlini
0 siblings, 1 reply; 3+ messages in thread
From: Paolo Carlini @ 2013-06-18 10:07 UTC (permalink / raw)
To: gcc-patches; +Cc: Jason Merrill
Hi,
On 06/08/2013 10:57 AM, Paolo Carlini wrote:
> Hi,
>
> the bug reminds us to update the documentation about the value of
> __cplusplus. I tentatively prepared the below, is it clear enough?
>
> We could probably apply something to the branch too, without the
> -std=c++1y bits, thus end simply like '; or @code{201103L}, per the
> 2011 C++ standard' or more verbosely say that with -std=c++1y too the
> value is 201103L.
Is this patch straightforward enough to go in? Opinions about the branch?
Thanks...
Paolo.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: PING [C++ docs patch] PR 56544
2013-06-18 10:07 ` PING " Paolo Carlini
@ 2013-06-19 9:04 ` Paolo Carlini
0 siblings, 0 replies; 3+ messages in thread
From: Paolo Carlini @ 2013-06-19 9:04 UTC (permalink / raw)
To: Paolo Carlini; +Cc: gcc-patches, Jason Merrill
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... I have no committed this simple doc update. Also, a 4_8-branch
version, attached below.
Thanks,
Paolo.
////////////////////
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2013-06-19 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/56544
* doc/cpp.texi [Standard Predefined Macros, __cplusplus]: Document
that now in C++ the value is correct per the C++ standards.
[-- Attachment #3: patch_56544_48 --]
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Index: doc/cpp.texi
===================================================================
--- doc/cpp.texi (revision 200192)
+++ doc/cpp.texi (working copy)
@@ -1926,11 +1926,9 @@ facilities of the standard C library available.
This macro is defined when the C++ compiler is in use. You can use
@code{__cplusplus} to test whether a header is compiled by a C compiler
or a C++ compiler. This macro is similar to @code{__STDC_VERSION__}, in
-that it expands to a version number. A fully conforming implementation
-of the 1998 C++ standard will define this macro to @code{199711L}. The
-GNU C++ compiler is not yet fully conforming, so it uses @code{1}
-instead. It is hoped to complete the implementation of standard C++
-in the near future.
+that it expands to a version number. Depending on the language standard
+selected, the value of the macro is @code{199711L}, as mandated by the
+1998 C++ standard, or @code{201103L}, per the 2011 C++ standard.
@item __OBJC__
This macro is defined, with value 1, when the Objective-C compiler is in
^ permalink raw reply [flat|nested] 3+ messages in thread
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