FreeBSD supports ppoll(2)

[gahr]

This also fixes this test error SubprocessTest.SetWithLotsninja: fatal: pipe: Too many open files caused by

if (fd_ >= static_cast<int>(FD_SETSIZE))                                      
    Fatal("pipe: %s", strerror(EMFILE)); 

in Subprocess::Start

[gblach]

ppoll() is available only on FreeBSD 10.2 and up, but not on older, but still supported releases.
EOL for 9.3 and 10.1 are established to 31 Dec 2016.

[gahr]

You are right. Let's keep this here until we EOL older releases.

[evmar]

Is there a way to test the FreeBSD version at compile-time? (E.g. an ifdef?)

[gblach]

#include <osreldate.h>
#if (__FreeBSD_version >= 1002000)

[gahr]

It's in sys/param.h

[nico]

Thanks!

[nico]

fwiw we don't put spaces between # and the word after it in ninja; maybe you can zap them in a follow-up

[gahr]

Done in #1187