Added bootstrap/configure option to force pselect

All modern Linux kernels have ppoll() but sometimes
you might want to compile on something ancient.

This patch adds the possibility to force the use
of pselect() instead by passing --force-pselect
to bootstrap/configure.

The use of ppoll() is still default for Linux
and OpenBSD

1 files changed, 6 insertions, 0 deletions

diff --git a/bootstrap.py b/bootstrap.py
index cff10ba..5682bf1 100755
--- a/bootstrap.py
+++ b/bootstrap.py
@@ -36,6 +36,8 @@ parser.add_option('--x64', action='store_true',
 parser.add_option('--platform',
                   help='target platform (' + '/'.join(platform_helper.platforms()) + ')',
                   choices=platform_helper.platforms())
+parser.add_option('--force-pselect', action='store_true',
+                  help="ppoll() is used by default on Linux and OpenBSD, but older versions might need to use pselect instead",)
 (options, conf_args) = parser.parse_args()
 
 
@@ -107,6 +109,10 @@ else:
         cflags.append('-D_WIN32_WINNT=0x0501')
     if options.x64:
         cflags.append('-m64')
+if (platform.is_linux() or platform.is_openbsd()) and not options.force_pselect:
+    cflags.append('-DUSE_PPOLL')
+if options.force_pselect:
+    conf_args.append("--force-pselect")
 args.extend(cflags)
 args.extend(ldflags)
 binary = 'ninja.bootstrap'