X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/95e9f3471ab6c7fb5e3350eefb670689d1fd11a7..d2777156522f139a858bd6b5b51e364826bc95a7:/ftmacros.h

diff --git a/ftmacros.h b/ftmacros.h
index 3fafab80..7975463b 100644
--- a/ftmacros.h
+++ b/ftmacros.h
@@ -45,7 +45,12 @@
  * namespace to the maximum extent possible"?
  */
 #if defined(sun) || defined(__sun)
-  #define __EXTENSIONS__
+  /*
+   * On Solaris Clang defines __EXTENSIONS__ automatically.
+   */
+  #ifndef __EXTENSIONS__
+    #define __EXTENSIONS__
+  #endif
 
   /*
    * We also need to define _XPG4_2 in order to get
@@ -105,9 +110,18 @@
    * don't whine about _BSD_SOURCE being deprecated; we still have
    * to define _BSD_SOURCE to handle older versions of GNU libc that
    * don't support _DEFAULT_SOURCE.
+   *
+   * But, if it's already defined, don't define it, so that we don't
+   * get a warning of it being redefined if it's defined as, for
+   * example, 1.
    */
-  #define _DEFAULT_SOURCE
-  #define _BSD_SOURCE
+  #ifndef _DEFAULT_SOURCE
+    #define _DEFAULT_SOURCE
+  #endif
+  /* Avoid redefining _BSD_SOURCE if it's already defined as for ex. 1 */
+  #ifndef _BSD_SOURCE
+    #define _BSD_SOURCE
+  #endif
 #endif
 
 #endif