Bug#674636: xmoto: FTBFS because of non-standard sa_restorer

[Pino Toscano]

Package: xmoto
Version: 0.5.9+dfsg-1
Severity: serious
Tags: patch
Justification: fails to build from source (but built successfully in the past)

Hi,

new xmoto 0.5.9 fails on ia64, kfreebsd and hurd because of the
unconditional "usage" of the sa_restorer field of struct sigaction.
POSIX[1] does not specify a sa_restorer field at all, and in the Linux
manpages[2] it is declared as obsolete and advertized against its use.

After all, what the code is really doing is to reset all the fields of
the struct sigaction v_act; what can be done to do that in a simplier
(and portable) way is just to memset it to 0 before using it (this also
avoids to manually set sa_flags, and a #ifdef snippet there).
Attached there is a patch for it (I admittely tested it only on Hurd,
but I think it should make xmoto compile on all the archs mentioned
above).

[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaction.html
[2] http://www.kernel.org/doc/man-pages/online/pages/man2/sigaction.2.html

Thanks,
-- 
Pino
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