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Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index a20349d8488..cf1545826b9 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -3329,9 +3329,10 @@ alignment. See your linker documentation for further information. @item packed This attribute, attached to @code{struct} or @code{union} type -definition, specifies that each member 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. +definition, specifies that each member (other than zero-width bitfields) +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. @opindex fshort-enums Specifying this attribute for @code{struct} and @code{union} types is @@ -9518,10 +9519,10 @@ way of knowing that that happened.) @subsection Structure-Packing Pragmas For compatibility with Win32, GCC supports a set of @code{#pragma} -directives which change the maximum alignment of members of structures, -unions, and classes subsequently defined. The @var{n} value below always -is required to be a small power of two and specifies the new alignment -in bytes. +directives which change the maximum alignment of members of structures +(other than zero-width bitfields), unions, and classes subsequently +defined. The @var{n} value below always is required to be a small power +of two and specifies the new alignment in bytes. @enumerate @item @code{#pragma pack(@var{n})} simply sets the new alignment. |