build: build v8 with -fvisibility=hidden -fvisibility-inlines-hidden

Author: joyeecheung

node.gyp

@@ -490,6 +490,19 @@
       ['clang==0 and OS!="win"', {
         'cflags': [ '-Wno-restrict', ],
       }],
+      # TODO(joyeecheung): investigate if it breaks addons.
+      # ['OS=="mac"', {
+      #   'xcode_settings': {
+      #     'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',  # -fvisibility=hidden
+      #     'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES'  # -fvisibility-inlines-hidden
+      #   },
+      # }],
+      # ['OS!="win" or clang==1', {
+      #   'cflags': [
+      #     '-fvisibility=hidden',
+      #     '-fvisibility-inlines-hidden'
+      #   ],
+      # }],
       # Pointer authentication for ARM64.
       ['target_arch=="arm64"', {
           'target_conditions': [

tools/v8_gypfiles/v8.gyp

@@ -41,16 +41,20 @@
         'AdditionalOptions': ['/utf-8']
       }
     },
+    'defines': [
+      'BUILDING_V8_SHARED',  # Make V8_EXPORT visible.
+    ],
     'conditions': [
       ['OS=="mac"', {
-        # Hide symbols that are not explicitly exported with V8_EXPORT.
-        # TODO(joyeecheung): enable it on other platforms. Currently gcc times out
-        # or run out of memory with -fvisibility=hidden on some machines in the CI.
         'xcode_settings': {
           'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',  # -fvisibility=hidden
+          'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES'  # -fvisibility-inlines-hidden
         },
-        'defines': [
-          'BUILDING_V8_SHARED',  # Make V8_EXPORT visible.
+      }],
+      ['OS!="win" or clang==1', {
+        'cflags': [
+          '-fvisibility=hidden',
+          '-fvisibility-inlines-hidden'
         ],
       }],
     ],