[PATCH] sim: filter out SIGSTKSZ [PR sim/28302]

[Joel Brobecker]

> > We map target signals to host signals so we can propagate signals
> > between the host & simulated worlds.  That means we need to know
> > the symbolic names & values of all signals that might be sent.
> > 
> > The tools that generate that list use signal.h and include all
> > symbols that start with "SIG" so as to automatically include any
> > new symbols that the C library might add.  Unfortunately, this
> > also picks up "SIGSTKSZ" which is not actually a signal itself,
> > but a signal related setting -- it's the size of the stack when
> > a signal is handled.
> > 
> > By itself this doesn't super matter as we will never see a signal
> > with that same value (since the range of valid signals tend to be
> > way less than 1024, and the size of the default signal stack will
> > never be that small).  But with recent glibc changes that make this
> > into a dynamic value instead of a compile-time constant, some users
> > see build failures when building the sim.
> > 
> > As suggested by Adam Sampson, update our scripts to ignore this
> > symbol to simplify everything and avoid the build failure.
> > 
> > Bug: https://sourceware.org/PR28302
> 
> This patch fixes a build problem that may be seen with GDB 11.  Should
> it be cherry-picked to gdb-11-branch to be included for the upcoming
> 11.2 release?

Thanks for highlighting this patch. It does seem interesting to
have this patch in the 11.2 release, so go right ahead and backport.
The patch already has a PR number, so this is good. I've changed
the PR to add the target mileston set to 11.2 as required by our
procedures, and re-opened the PR for now.

Thanks,
-- 
Joel