6 files changed, 4 insertions, 50 deletions
diff --git a/src/core/iomgr/socket_utils_linux.c b/src/core/iomgr/socket_utils_linux.c
index 7ef58940c2..f3c22187d7 100644
--- a/src/core/iomgr/socket_utils_linux.c
+++ b/src/core/iomgr/socket_utils_linux.c
@@ -31,12 +31,9 @@
  *
  */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
 #include <grpc/support/port_platform.h>
 
-#ifdef GPR_LINUX
+#ifdef GPR_LINUX_SOCKETUTILS
 
 #include "src/core/iomgr/socket_utils_posix.h"
 
diff --git a/src/core/support/file_posix.c b/src/core/support/file_posix.c
index cb48b3d52f..e1765666db 100644
--- a/src/core/support/file_posix.c
+++ b/src/core/support/file_posix.c
@@ -31,19 +31,6 @@
  *
  */
 
-/* Posix code for gpr fdopen and mkstemp support. */
-
-#if !defined _POSIX_C_SOURCE || _POSIX_C_SOURCE < 200112L
-#undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200112L
-#endif
-
-/* Don't know why I have to do this for mkstemp, looks like _POSIX_C_SOURCE
-   should be enough... */
-#ifndef _BSD_SOURCE
-#define _BSD_SOURCE
-#endif
-
 #include <grpc/support/port_platform.h>
 
 #ifdef GPR_POSIX_FILE
diff --git a/src/core/support/log_posix.c b/src/core/support/log_posix.c
index 05f45de130..36479baeed 100644
--- a/src/core/support/log_posix.c
+++ b/src/core/support/log_posix.c
@@ -31,16 +31,6 @@
  *
  */
 
-#if !defined _POSIX_C_SOURCE || _POSIX_C_SOURCE < 200112L
-#undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200112L
-#endif
-
-/* FIXME: "posix" files probably shouldn't depend on _GNU_SOURCE */
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include <grpc/support/port_platform.h>
 
 #if defined(GPR_POSIX_LOG)
diff --git a/src/core/support/string_posix.c b/src/core/support/string_posix.c
index a6bb8058e6..b6f0cd4af0 100644
--- a/src/core/support/string_posix.c
+++ b/src/core/support/string_posix.c
@@ -31,13 +31,6 @@
  *
  */
 
-/* Posix code for gpr snprintf support. */
-
-#if !defined _POSIX_C_SOURCE || _POSIX_C_SOURCE < 200112L
-#undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200112L
-#endif
-
 #include <grpc/support/port_platform.h>
 
 #ifdef GPR_POSIX_STRING
diff --git a/src/core/support/sync_posix.c b/src/core/support/sync_posix.c
index a28a4c6bf4..94fc1b0bec 100644
--- a/src/core/support/sync_posix.c
+++ b/src/core/support/sync_posix.c
@@ -31,13 +31,6 @@
  *
  */
 
-/* Posix gpr synchroization support code. */
-
-#if !defined _POSIX_C_SOURCE || _POSIX_C_SOURCE < 199309L
-#undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 199309L
-#endif
-
 #include <grpc/support/port_platform.h>
 
 #ifdef GPR_POSIX_SYNC
diff --git a/src/core/support/time_posix.c b/src/core/support/time_posix.c
index 7f0f028183..4af537d974 100644
--- a/src/core/support/time_posix.c
+++ b/src/core/support/time_posix.c
@@ -31,14 +31,6 @@
  *
  */
 
-/* Posix code for gpr time support. */
-
-/* So we get nanosleep and clock_* */
-#if !defined _POSIX_C_SOURCE || _POSIX_C_SOURCE < 199309L
-#undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 199309L
-#endif
-
 #include <grpc/support/port_platform.h>
 
 #ifdef GPR_POSIX_TIME
@@ -70,7 +62,9 @@ gpr_timespec gpr_now(void) {
 }
 #else
 /* For some reason Apple's OSes haven't implemented clock_gettime. */
-/* TODO(klempner): Add special handling for Apple. */
+
+#include <sys/time.h>
+
 gpr_timespec gpr_now(void) {
   gpr_timespec now;
   struct timeval now_tv;