BUILD: debug/cli: condition test of O_ASYNC to its existence
David Carlier reported a build breakage on Haiku since commit
5be7c198e ("DEBUG: cli: add a new "debug dev fd" expert command")
due to O_ASYNC not being defined. Ilya also reported it broke the
build on Cygwin. It's not that portable and sometimes defined as
O_NONBLOCK for portability. But here we don't even need that, as
we already condition other flags, let's just ignore it if it does
not exist.
diff --git a/src/debug.c b/src/debug.c
index c15c926..1a69697 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -1075,7 +1075,9 @@
case O_NOCTTY: chunk_appendf(&trash, ",O_NOCTTY"); break;
case O_TRUNC: chunk_appendf(&trash, ",O_TRUNC"); break;
case O_APPEND: chunk_appendf(&trash, ",O_APPEND"); break;
+#ifdef O_ASYNC
case O_ASYNC: chunk_appendf(&trash, ",O_ASYNC"); break;
+#endif
#ifdef O_DIRECT
case O_DIRECT: chunk_appendf(&trash, ",O_DIRECT"); break;
#endif