From 4d3727a0a100f4069aae0bad599720c646574dcc Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 17 Apr 2019 19:10:50 -0700
Subject: [PATCH] ircd::fs: Condition various runtime support on compilation
 too.

---
 ircd/fs.cc | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/ircd/fs.cc b/ircd/fs.cc
index 17743dea2..2ca92cb6d 100644
--- a/ircd/fs.cc
+++ b/ircd/fs.cc
@@ -46,29 +46,45 @@ ircd::fs::support_pwritev2
 decltype(ircd::fs::support_sync)
 ircd::fs::support_sync
 {
-	info::kversion[0] >= 4 &&
-	info::kversion[1] >= 7
+	#if defined(HAVE_PWRITEV2) && defined(RWF_SYNC)
+		info::kversion[0] >= 4 &&
+		info::kversion[1] >= 7
+	#else
+		false
+	#endif
 };
 
 decltype(ircd::fs::support_dsync)
 ircd::fs::support_dsync
 {
-	info::kversion[0] >= 4 &&
-	info::kversion[1] >= 7
+	#if defined(HAVE_PWRITEV2) && defined(RWF_DSYNC)
+		info::kversion[0] >= 4 &&
+		info::kversion[1] >= 7
+	#else
+		false
+	#endif
 };
 
 decltype(ircd::fs::support_hipri)
 ircd::fs::support_hipri
 {
-	info::kversion[0] >= 4 &&
-	info::kversion[1] >= 6
+	#if defined(HAVE_PWRITEV2) && defined(RWF_HIPRI)
+		info::kversion[0] >= 4 &&
+		info::kversion[1] >= 6
+	#else
+		false
+	#endif
 };
 
 decltype(ircd::fs::support_nowait)
 ircd::fs::support_nowait
 {
-	info::kversion[0] >= 4 &&
-	info::kversion[1] >= 14
+	#if defined(HAVE_PWRITEV2) && defined(RWF_NOWAIT)
+		info::kversion[0] >= 4 &&
+		info::kversion[1] >= 14
+	#else
+		false
+	#endif
 };
 
 decltype(ircd::fs::support_append)