--- old/make/lib/Lib-java.base.gmk	2018-09-05 14:09:38.298829021 +0200
+++ new/make/lib/Lib-java.base.gmk	2018-09-05 14:09:38.002829023 +0200
@@ -128,14 +128,6 @@
 
 ifeq ($(OPENJDK_TARGET_OS_TYPE), unix)
   ifeq ($(STATIC_BUILD), false)
-
-    LIBJSIG_MAPFILE := $(wildcard $(TOPDIR)/make/mapfiles/libjsig/mapfile-vers-$(OPENJDK_TARGET_OS))
-
-    ifeq ($(OPENJDK_TARGET_OS), linux)
-      # FIXME: This is probably not what we want to do, but keep it now for compatibility.
-      LIBJSIG_CFLAGS := $(EXPORT_ALL_SYMBOLS)
-    endif
-
     $(eval $(call SetupJdkLibrary, BUILD_LIBJSIG, \
         NAME := jsig, \
         CFLAGS := $(CFLAGS_JDKLIB) $(LIBJSIG_CFLAGS), \
@@ -144,7 +136,6 @@
         LIBS_linux := $(LIBDL), \
         LIBS_solaris := $(LIBDL), \
         LIBS_aix := $(LIBDL), \
-        MAPFILE := $(LIBJSIG_MAPFILE), \
     ))
 
     TARGETS += $(BUILD_LIBJSIG)
--- old/src/java.base/unix/native/libjsig/jsig.c	2018-09-05 14:09:38.982829016 +0200
+++ new/src/java.base/unix/native/libjsig/jsig.c	2018-09-05 14:09:38.670829018 +0200
@@ -29,6 +29,18 @@
  * Used for signal-chaining. See RFE 4381843.
  */
 
+#include "jni.h"
+
+#ifdef SOLARIS
+/* Our redeclarations of the system functions must not have a less
+ * restrictive linker scoping, so we have to declare them as JNIEXPORT
+ * before including signal.h */
+#include "sys/signal.h"
+JNIEXPORT void (*signal(int sig, void (*disp)(int)))(int);
+JNIEXPORT void (*sigset(int sig, void (*disp)(int)))(int);
+JNIEXPORT int sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
+#endif
+
 #include <dlfcn.h>
 #include <errno.h>
 #include <pthread.h>
@@ -208,7 +220,7 @@
   }
 }
 
-sa_handler_t signal(int sig, sa_handler_t disp) {
+JNIEXPORT sa_handler_t signal(int sig, sa_handler_t disp) {
   if (sig < 0 || sig >= MAX_SIGNALS) {
     errno = EINVAL;
     return SIG_ERR;
@@ -217,7 +229,7 @@
   return set_signal(sig, disp, false);
 }
 
-sa_handler_t sigset(int sig, sa_handler_t disp) {
+JNIEXPORT sa_handler_t sigset(int sig, sa_handler_t disp) {
 #ifdef _ALLBSD_SOURCE
   printf("sigset() is not supported by BSD");
   exit(0);
@@ -243,7 +255,7 @@
   return (*os_sigaction)(sig, act, oact);
 }
 
-int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
+JNIEXPORT int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
   int res;
   bool sigused;
   struct sigaction oldAct;
--- old/make/mapfiles/libjsig/mapfile-vers-solaris	2018-09-05 14:09:39.690829010 +0200
+++ /dev/null	2018-06-13 13:14:25.719029190 +0200
@@ -1,37 +0,0 @@
-#
-# Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
-# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-#
-# This code is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License version 2 only, as
-# published by the Free Software Foundation.
-#
-# This code is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-# version 2 for more details (a copy is included in the LICENSE file that
-# accompanied this code).
-#
-# You should have received a copy of the GNU General Public License version
-# 2 along with this work; if not, write to the Free Software Foundation,
-# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-#
-# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-# or visit www.oracle.com if you need additional information or have any
-# questions.
-#  
-#
-
-# Define library interface.
-
-SUNWprivate_1.1 {
-        global:
-            JVM_begin_signal_setting;
-            JVM_end_signal_setting;
-            JVM_get_signal_action;
-            sigaction;
-            signal;
-            sigset;
-        local:
-                *;
-};