Re: [Xen-devel] Xen 4.6.0-rc1 build with lock_profile=y crash_debug=y, frame_pointer=y and domain.c:241: error: negative width in bit-field â<anonymous>â

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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 â<anonymous>â
>
> 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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