Joerg Sonnenberger schrieb:
On Sun, Dec 28, 2008 at 10:00:37PM +0100, Dimitry Andric wrote:
On 2008-12-28 20:30, Stanislav Sedov wrote:
- ACPI_OBJECT acpiarg[0];
+ ACPI_OBJECT acpiarg[1];
I wonder how does gcc allowed this. It emits warnings only in
pedantic mode which we cannot use to compile kernel with.
Zero-sized arrays are non-standard, but have been allowed by gcc (and
many other compilers) since a long time, so it is logical that it
doesn't warn about it by default.
Having no size at all would be standard compliant, e.g. acpiarg[[];
No, it wouldn't be standard compliant. You are confusing this with a
flexible array member as last entry of a struct declaration (C99
§6.7.2.1:16). As an (old) extension GCC accepts [0] as flexible array
member, too.
The declaration here is a declaration of an array with automatic storage
duration and no linkage. Having nothing in the [] (and no initialiser)
would make the array an incomplete type (C99 §6.7.5.2:4), which is not
valid for a local variable (C99 §6.2.2:6 and §6.7:7). Also 0 as size
expression clearly violates the standard: "If the expression is a
constant expression, it shall have a value greater than zero." (C99
§6.7.5.2:1).
A local array with length 0 has no practical purpose either.
Regards
Christoph
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