From c3d3178b0e14dc1612b397f115d7853200b62146 Mon Sep 17 00:00:00 2001
From: Bruce Cran <BCran@fusionio.com>
Date: Sun, 10 Jul 2011 20:56:23 +0200
Subject: [PATCH] Take __weak out of the compiler namespace

With Xcode 4 on OS X shipping LLVM by default, I tried building fio with
clang and found that the definition of __weak conflicts with something
clang defines.  I've attached a patch which replaces the double
underscores with a single underscore, removing it from the
compiler-dependant namespace.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---
 compiler/compiler.h |  6 +++---
 helpers.c           |  8 ++++----
 helpers.h           | 10 +++++-----
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 33500a9b..8dec350b 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -15,11 +15,11 @@
 
 #define uninitialized_var(x) x = x
 
-#ifndef __weak
+#ifndef _weak
 #ifndef __CYGWIN__
-#define __weak	__attribute__((weak))
+#define _weak	__attribute__((weak))
 #else
-#define __weak
+#define _weak
 #endif
 #endif
 
diff --git a/helpers.c b/helpers.c
index 377dd02a..1b6dea8e 100644
--- a/helpers.c
+++ b/helpers.c
@@ -10,18 +10,18 @@
 #include "os/os.h"
 
 #ifndef __NR_fallocate
-int __weak posix_fallocate(int fd, off_t offset, off_t len)
+int _weak posix_fallocate(int fd, off_t offset, off_t len)
 {
 	return 0;
 }
 #endif
 
-int __weak inet_aton(const char *cp, struct in_addr *inp)
+int _weak inet_aton(const char *cp, struct in_addr *inp)
 {
 	return 0;
 }
 
-int __weak clock_gettime(clockid_t clk_id, struct timespec *ts)
+int _weak clock_gettime(clockid_t clk_id, struct timespec *ts)
 {
 	struct timeval tv;
 	int ret;
@@ -35,7 +35,7 @@ int __weak clock_gettime(clockid_t clk_id, struct timespec *ts)
 }
 
 #ifndef __NR_sync_file_range
-int __weak sync_file_range(int fd, off64_t offset, off64_t nbytes,
+int _weak sync_file_range(int fd, off64_t offset, off64_t nbytes,
 			   unsigned int flags)
 {
 	errno = ENOSYS;
diff --git a/helpers.h b/helpers.h
index 60729632..7b1ad349 100644
--- a/helpers.h
+++ b/helpers.h
@@ -7,11 +7,11 @@
 
 struct in_addr;
 
-extern int __weak posix_memalign(void **ptr, size_t align, size_t size);
-extern int __weak posix_fallocate(int fd, off_t offset, off_t len);
-extern int __weak inet_aton(const char *cp, struct in_addr *inp);
-extern int __weak clock_gettime(clockid_t clk_id, struct timespec *ts);
-extern int __weak sync_file_range(int fd, off64_t offset, off64_t nbytes,
+extern int _weak posix_memalign(void **ptr, size_t align, size_t size);
+extern int _weak posix_fallocate(int fd, off_t offset, off_t len);
+extern int _weak inet_aton(const char *cp, struct in_addr *inp);
+extern int _weak clock_gettime(clockid_t clk_id, struct timespec *ts);
+extern int _weak sync_file_range(int fd, off64_t offset, off64_t nbytes,
 					unsigned int flags);
 
 #endif /* FIO_HELPERS_H_ */
-- 
2.25.1