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, 5 insertions, 0 deletions

diff --git a/configure.py b/configure.py
index 7c90e66..22eb1e5 100755
--- a/configure.py
+++ b/configure.py
@@ -47,6 +47,8 @@ parser.add_option('--with-gtest', metavar='PATH',
 parser.add_option('--with-python', metavar='EXE',
                   help='use EXE as the Python interpreter',
                   default=os.path.basename(sys.executable))
+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, args) = parser.parse_args()
 if args:
     print('ERROR: extra unparsed command-line arguments:', args)
@@ -163,6 +165,9 @@ else:
         cflags.append('-fno-omit-frame-pointer')
         libs.extend(['-Wl,--no-as-needed', '-lprofiler'])
 
+if (platform.is_linux() or platform.is_openbsd()) and not options.force_pselect:
+    cflags.append('-DUSE_PPOLL')
+
 def shell_escape(str):
     """Escape str such that it's interpreted as a single argument by
     the shell."""