build: enable runtime linking

Enable runtime linking of shared objects. This will
allow loading of symbols using the RTLD_GLOBAL flag.

PR-URL: nodejs#15286
Fixes: nodejs#15243
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

node.gyp

@@ -784,7 +784,7 @@
             'common.gypi',
           ],
 
-          'ldflags': ['-Wl,-bE:<(PRODUCT_DIR)/node.exp'],
+          'ldflags': ['-Wl,-bE:<(PRODUCT_DIR)/node.exp', '-Wl,-brtl'],
         },
         {
           'target_name': 'node_exp',

test/addons/dlopen-ping-pong/binding.gyp

@@ -10,10 +10,9 @@
           'xcode_settings': {
             'OTHER_LDFLAGS': [ '-Wl,-undefined', '-Wl,dynamic_lookup' ]
         }}],
-        # Pass erok flag to the linker, to prevent unresolved symbols
-        # from failing. Still, the test won't pass, so we'll skip it on AIX.
+        # Enable the shared object to be linked by runtime linker
         ['OS=="aix"', {
-          'ldflags': [ '-Wl,-berok' ]
+          'ldflags': [ '-Wl,-G' ]
         }]],
     },
     {

test/addons/dlopen-ping-pong/test.js

@@ -4,9 +4,6 @@ const common = require('../../common');
 if (common.isWindows)
   common.skip('dlopen global symbol loading is not supported on this os.');
 
-if (common.isAIX)
-  common.skip('this test does not pass on AIX.');
-
 const assert = require('assert');
 const path = require('path');
 const os = require('os');