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| author | nathan <nathan@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-07-25 10:52:31 +0000 |
|---|---|---|
| committer | nathan <nathan@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-07-25 10:52:31 +0000 |
| commit | 2f215800416d889062e7764e5f01b3a8f199efb0 (patch) | |
| tree | 0df8d2ae367eb2ac46fe9493f067c47d2c25b9c9 /gcc/doc/extend.texi | |
| parent | 394bee60e90acca7ec74556b809179fb81ec61f2 (diff) | |
| download | ppe42-gcc-2f215800416d889062e7764e5f01b3a8f199efb0.tar.gz ppe42-gcc-2f215800416d889062e7764e5f01b3a8f199efb0.zip | |
* doc/extend.texi (Function Attributes): GNU C++ does now allow
unused parameter decls.
(Attribute Syntax): GNU C++ does not allow label attributes to be
after the ':'.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@69781 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 4bf39cac01f..0e76b6b08e1 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -2268,8 +2268,7 @@ These attributes are not currently implemented for Objective-C@. @item unused This attribute, attached to a function, means that the function is meant to be possibly unused. GCC will not produce a warning for this -function. GNU C++ does not currently support this attribute as -definitions without parameters are valid in C++. +function. @cindex @code{used} attribute. @item used @@ -2725,14 +2724,18 @@ with the list being a single string constant. An @dfn{attribute specifier list} is a sequence of one or more attribute specifiers, not separated by any other tokens. -An attribute specifier list may appear after the colon following a +In GNU C, an attribute specifier list may appear after the colon following a label, other than a @code{case} or @code{default} label. The only attribute it makes sense to use after a label is @code{unused}. This feature is intended for code generated by programs which contains labels that may be unused but which is compiled with @option{-Wall}. It would not normally be appropriate to use in it human-written code, though it could be useful in cases where the code that jumps to the label is -contained within an @code{#ifdef} conditional. +contained within an @code{#ifdef} conditional. GNU C++ does not permit +such placement of attribute lists, as it is permissible for a +declaration, which could begin with an attribute list, to be labelled in +C++. Declarations cannot be labelled in C90 or C99, so the ambiguity +does not arise there. An attribute specifier list may appear as part of a @code{struct}, @code{union} or @code{enum} specifier. It may go either immediately |
