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c-typeck.c (c_alignof): Error on incomplete types.

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* c-typeck.c (c_alignof): Error on incomplete types.
        * extend.texi (Alignment): Document this.

From-SVN: r32522
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Stan Shebs 2000-03-14 08:24:21 +00:00 • committed by Richard Henderson
parent d9420976f2
commit 9d27bffe6d
3 changed files with 13 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-03-14 Stan Shebs <shebs@apple.com>
* c-typeck.c (c_alignof): Error on incomplete types.
* extend.texi (Alignment): Document this.
2000-03-13 Zack Weinberg <zack@wolery.cumb.org>
* cppfiles.c: Include mkdeps.h.

6
gcc/c-typeck.c
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@ -781,6 +781,12 @@ c_alignof (type)
if (code == VOID_TYPE || code == ERROR_MARK)
return size_one_node;
if (TYPE_SIZE (type) == 0)
{
error ("__alignof__ applied to an incomplete type");
return size_zero_node;
}
return size_int (TYPE_ALIGN (type) / BITS_PER_UNIT);
}

2
gcc/extend.texi
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@ -1879,6 +1879,8 @@ the value of @code{__alignof__ (foo1.y)} is probably 2 or 4, the same as
@code{__alignof__ (int)}, even though the data type of @code{foo1.y}
does not itself demand any alignment.@refill
It is an error to ask for the alignment of an incomplete type.
A related feature which lets you specify the alignment of an object is
@code{__attribute__ ((aligned (@var{alignment})))}; see the following
section.