[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] configure: Make epoll_create1 test work around
Re: [Qemu-devel] [PATCH] configure: Make epoll_create1 test work around SPARC glibc bug
Wed, 20 Apr 2011 19:31:22 +0300
On Wed, Apr 20, 2011 at 9:53 AM, Peter Maydell <address@hidden> wrote:
> On 19 April 2011 21:36, Blue Swirl <address@hidden> wrote:
>> Sorry, I just picked a define without much thought. A more specific
>> one would be flags parameter of epoll_create1(), like EPOLL_CLOEXEC or
>> EPOLL_NONBLOCK. We don't use them now since the target system call
>> argument is passed untranslated to host, but that is actually not
>> correct, since the bit definitions could be different. So checking for
>> one of those should be OK.
> Unfortunately the header file on the system in question defines
> both EPOLL_CLOEXEC and EPOLL_NONBLOCK even though it doesn't
> prototype epoll_create1(). So this idea won't work.
> The bug we are effectively trying to work around is the one fixed
> by this libc patch:
> The only problem with the header is that it doesn't declare the
> function, so the only way to detect it is to do something that
> will fail if the function isn't declared, like compiling -Werror.
This also fails without -Werror: