[Bug 3883] New: sigwait fails to compile without rt_sigtimedwait

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3883

           Summary: sigwait fails to compile without rt_sigtimedwait
           Product: uClibc
           Version: 0.9.32
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at uclibc.org
        ReportedBy: michael at talamasca.ocis.net
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Created attachment 3427
  --> https://bugs.busybox.net/attachment.cgi?id=3427
Patch to avoid sigwaitinfo use on old kernels

On my system, stock uClibc-0.9.32 fails to compile with:

libc/libc_so.a(sigwait.os): In function `sigwait':
sigwait.c:(.text.sigwait+0x13): undefined reference to `__GI_sigwaitinfo'

The problem is that sigwait() is defined in terms of sigwaitinfo() if
__UCLIBC_HAS_REALTIME is defined, but sigwaitinfo is not generated because my
kernel doesn't have the rt_sigtimedwait call.

Attached is a patch to steer uClibc down the non-realtime path if the syscall
isn't available.

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