On Tue, Aug 25, 2015 at 12:43:38PM -0400, Konrad Rzeszutek Wilk wrote:
> I am troubleshooting an locking issue and figured I would enable extra
> options.
>
> But now I am hitting this build issue:
>
> domain.c:241: error: negative width in bit-field ‘<anonymous>’
>
> Which is:
>
> 229 struct domain *alloc_domain_struct(void)
> 230 {
> 231 struct domain *d;
> ...
> 241 BUILD_BUG_ON(sizeof(*d) > PAGE_SIZE);
>
In xen/include/xen/lib.h:
14 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
15 /* Force a compilation error if condition is true */
16 #define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); })
17
18 /* Force a compilation error if condition is true, but also produce a
19 result (of value 0 and type size_t), so the expression can be used
20 e.g. in a structure initializer (or where-ever else comma expressions
21 aren't permitted). */
22 #define BUILD_BUG_ON_ZERO(cond) \
23 sizeof(struct { _Static_assert(!(cond), "!(" #cond ")"); })
24 #else
25 #define BUILD_BUG_ON_ZERO(cond) sizeof(struct { int:-!!(cond); })
26 #define BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
27 #endif
So you're using very old gcc and your struct domain is larger than 1
page.
Wei.
> Thoughts?
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