From 6b5ac4feba72991143d4f07f8b602dac48e7ab22 Mon Sep 17 00:00:00 2001
From: Sara Golemon <sgolemon@fb.com>
Date: Wed, 10 Sep 2014 11:35:44 -0700
Subject: [PATCH] Fix folly compilation on MacOSX

Summary:
We don't always have features.h
and our glibc doesn't have __GLIBC_PREREQ()

@override-unit-failures

Test Plan: Builds on MacOSX

Reviewed By: pt@fb.com

Subscribers: njormrod

FB internal diff: D1546679
---
 folly/ThreadName.h              | 10 +++++++++-
 folly/io/async/EventFDWrapper.h | 18 +++++++++++++++---
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/folly/ThreadName.h b/folly/ThreadName.h
index dbcdc84e..f2b7d063 100644
--- a/folly/ThreadName.h
+++ b/folly/ThreadName.h
@@ -21,8 +21,16 @@
 
 namespace folly {
 
+// This looks a bit weird, but it's necessary to avoid
+// having an undefined compiler function called.
+#if defined(__GLIBC__) && !defined(__APPLE__)
+#if __GLIBC_PREREQ(2, 12)
+# define FOLLY_GLIBC_2_12
+#endif
+#endif
+
 inline bool setThreadName(pthread_t id, StringPiece name) {
-#if (defined(__GLIBC__) && __GLIBC_PREREQ(2, 12))
+#ifdef FOLLY_GLIBC_2_12
   return 0 == pthread_setname_np(id, name.fbstr().substr(0, 15).c_str());
 #else
   return false;
diff --git a/folly/io/async/EventFDWrapper.h b/folly/io/async/EventFDWrapper.h
index 294d9d37..80a81735 100644
--- a/folly/io/async/EventFDWrapper.h
+++ b/folly/io/async/EventFDWrapper.h
@@ -21,12 +21,24 @@
 
 #pragma once
 
-#include <features.h>
+#ifndef FOLLY_NO_CONFIG
+#include <folly/folly-config.h>
+#endif
+
+#ifdef FOLLY_HAVE_FEATURES_H
+# include <features.h>
+#endif
+
+#if defined(__GLIBC__) && !defined(__APPLE__)
+#if __GLIBC_PREREQ(2, 9)
+# define FOLLY_GLIBC_2_9
+#endif
+#endif
 
 // <sys/eventfd.h> doesn't exist on older glibc versions
-#if (defined(__GLIBC__) && __GLIBC_PREREQ(2, 9))
+#ifdef FOLLY_GLIBC_2_9
 #include <sys/eventfd.h>
-#else /* !(defined(__GLIBC__) && __GLIBC_PREREQ(2, 9)) */
+#else /* !def FOLLY_GLIBC_2_9 */
 
 #include <sys/syscall.h>
 #include <unistd.h>
-- 
2.34.1