Do not block SIGIO in platforms that don't have it.

* src/comp.c (comp--compile-ctxt-to-file): Add a preprocessor check to
avoid blocking SIGIO in platforms that don't have it.

Signed-off-by: Andrea Corallo <akrl@sdf.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/comp.c b/src/comp.c
index c9426d1990e..87b86ddba7f 100644
--- a/src/comp.c
+++ b/src/comp.c
@@ -3364,7 +3364,9 @@ DEFUN ("comp--compile-ctxt-to-file", Fcomp__compile_ctxt_to_file,
       sigemptyset (&blocked);
       sigaddset (&blocked, SIGALRM);
       sigaddset (&blocked, SIGINT);
+#ifdef USABLE_SIGIO
       sigaddset (&blocked, SIGIO);
+#endif
       pthread_sigmask (SIG_BLOCK, &blocked, &oldset);
     }
   emit_ctxt_code ();