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re PR c++/25759 (Documentation not clear, attribute packed on class in C++) 

2018-11-15  Sandra Loosemore  <sandra@codesourcery.com>

	PR c++/25759

	gcc/
	* doc/extend.texi (Common Type Attributes): Make it explicit
	that attribute "packed" can apply to C++ classes.

From-SVN: r266199
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Sandra Loosemore 2018-11-15 19:50:41 -05:00 committed by Sandra Loosemore
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2 changed files with 17 additions and 11 deletions
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@ -1,3 +1,9 @@
2018-11-15 Sandra Loosemore <sandra@codesourcery.com>
PR c++/25759
* doc/extend.texi (Common Type Attributes): Make it explicit
that attribute "packed" can apply to C++ classes.
2018-11-15 Martin Sebor <msebor@redhat.com>
PR c++/87541

22
gcc/doc/extend.texi
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@ -7314,17 +7314,16 @@ or @code{__pointer__} for the mode used to represent pointers.
@item packed
@cindex @code{packed} type attribute
This attribute, attached to @code{struct} or @code{union} type
definition, specifies that each member (other than zero-width bit-fields)
of the structure or union is placed to minimize the memory required. When
attached to an @code{enum} definition, it indicates that the smallest
integral type should be used.
This attribute, attached to @code{struct}, @code{union}, or C++ @code{class}
type definition, specifies that each of its members (other than zero-width
bit-fields) is placed to minimize the memory required. This is equivalent
to specifying the @code{packed} attribute on each of the members.
@opindex fshort-enums
Specifying the @code{packed} attribute for @code{struct} and @code{union}
types is equivalent to specifying the @code{packed} attribute on each
of the structure or union members. Specifying the @option{-fshort-enums}
flag on the command line is equivalent to specifying the @code{packed}
When attached to an @code{enum} definition, the @code{packed} attribute
indicates that the smallest integral type should be used.
Specifying the @option{-fshort-enums} flag on the command line
is equivalent to specifying the @code{packed}
attribute on all @code{enum} definitions.
In the following example @code{struct my_packed_struct}'s members are
@ -7348,8 +7347,9 @@ struct __attribute__ ((__packed__)) my_packed_struct
@end smallexample
You may only specify the @code{packed} attribute attribute on the definition
of an @code{enum}, @code{struct} or @code{union}, not on a @code{typedef}
that does not also define the enumerated type, structure or union.
of an @code{enum}, @code{struct}, @code{union}, or @code{class},
not on a @code{typedef} that does not also define the enumerated type,
structure, union, or class.
@item scalar_storage_order ("@var{endianness}")
@cindex @code{scalar_storage_order} type attribute