HDFS-8346. libwebhdfs build fails during link due to unresolved external symbols. Contributed by Chris Nauroth.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -695,6 +695,9 @@ Release 2.8.0 - UNRELEASED
 
     HDFS-6285. tidy an error log inside BlockReceiver. (Liang Xie via umamahesh)
 
+    HDFS-8346. libwebhdfs build fails during link due to unresolved external
+    symbols. (Chris Nauroth via wheat9)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/contrib/libwebhdfs/CMakeLists.txt

@@ -31,6 +31,9 @@ add_dual_library(webhdfs
     src/hdfs_json_parser.c
     ../../main/native/libhdfs/exception.c
     ../../main/native/libhdfs/jni_helper.c
+    ../../${OS_DIR}/mutexes.c
+    ../../${OS_DIR}/thread_local_storage.c
+    ../../main/native/libhdfs/common/htable.c
 )
 target_link_dual_libraries(webhdfs
     ${JAVA_JVM_LIBRARY}

hadoop-hdfs-project/hadoop-hdfs/src/contrib/libwebhdfs/src/hdfs_http_client.c

@@ -28,7 +28,15 @@ static volatile int curlGlobalInited = 0;
 
 const char *hdfs_strerror(int errnoval)
 {
-  return terror(errnoval);
+#if defined(__sun)
+// MT-Safe under Solaris which doesn't support sys_errlist/sys_nerr
+  return strerror(errnoval);
+#else
+  if ((errnoval < 0) || (errnoval >= sys_nerr)) {
+    return "unknown error.";
+  }
+  return sys_errlist[errnoval];
+#endif
 }
 
 int initResponseBuffer(struct ResponseBuffer **buffer)

hadoop-hdfs-project/hadoop-hdfs/src/contrib/libwebhdfs/src/hdfs_http_client.h

@@ -284,7 +284,7 @@ int launchDnAPPEND(const char *url, struct webhdfsBuffer *buffer,
                    struct Response **response) __attribute__ ((warn_unused_result));
 
 /**
- * Call sys_errlist to get the error message string for the given error code
+ * Thread-safe strerror alternative.
  *
  * @param errnoval  The error code value
  * @return          The error message string mapped to the given error code