From b22d95e46a8a3afee60579144c59ec28376e9807 Mon Sep 17 00:00:00 2001
From: Sean Cannella <seanc@fb.com>
Date: Mon, 29 Jul 2013 12:36:55 -0700
Subject: [PATCH] fix folly Range compilation on FreeBSD

Summary: - memrchr is GNU + Linux specific, it turns out

Test Plan: - compiled on FreeBSD, contbuild

Reviewed By: delong.j@fb.com

FB internal diff: D900935
---
 folly/Range.h      | 4 ++--
 folly/configure.ac | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/folly/Range.h b/folly/Range.h
index 85a554c5..a1cce77f 100644
--- a/folly/Range.h
+++ b/folly/Range.h
@@ -705,7 +705,7 @@ inline size_t qfind(const Range<const char*>& haystack, const char& needle) {
   return pos == nullptr ? std::string::npos : pos - haystack.data();
 }
 
-#ifdef _GNU_SOURCE // memrchr is a GNU extension
+#if FOLLY_HAVE_MEMRCHR
 template <>
 inline size_t rfind(const Range<const char*>& haystack, const char& needle) {
   auto pos = static_cast<const char*>(
@@ -723,7 +723,7 @@ inline size_t qfind(const Range<const unsigned char*>& haystack,
   return pos == nullptr ? std::string::npos : pos - haystack.data();
 }
 
-#ifdef _GNU_SOURCE // memrchr is a GNU extension
+#if FOLLY_HAVE_MEMRCHR
 template <>
 inline size_t rfind(const Range<const unsigned char*>& haystack,
                     const unsigned char& needle) {
diff --git a/folly/configure.ac b/folly/configure.ac
index 33ac2e8e..8d5765c1 100644
--- a/folly/configure.ac
+++ b/folly/configure.ac
@@ -86,7 +86,8 @@ AC_CHECK_FUNCS([getdelim \
                 pthread_yield \
                 rallocm \
                 malloc_size \
-                malloc_usable_size])
+                malloc_usable_size \
+                memrchr])
 
 if test "$ac_cv_func_pthread_yield" = "no"; then
    AC_CHECK_HEADERS([sched.h])
-- 
2.34.1