From 5982e7a6e88bec3f7996fc97bd211a73b2d93479 Mon Sep 17 00:00:00 2001
From: Refael Ackermann <refack@gmail.com>
Date: Fri, 5 Oct 2018 19:27:15 -0400
Subject: [PATCH] deps,v8: link with `atomic` for platforms lacking CAS

Fixes: https://github.com/nodejs/node-v8/issues/81
---
 deps/v8/gypfiles/features.gypi |  2 ++
 deps/v8/gypfiles/v8.gyp        | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/deps/v8/gypfiles/features.gypi b/deps/v8/gypfiles/features.gypi
index a38e5fa9720da8..e17011a67405f7 100644
--- a/deps/v8/gypfiles/features.gypi
+++ b/deps/v8/gypfiles/features.gypi
@@ -31,6 +31,8 @@
   'variables': {
     'v8_target_arch%': '<(target_arch)',
 
+    'v8_current_cpu%': '<(target_arch)',
+
     # Emulate GN variables
     'conditions': [
       ['OS=="android"', { # GYP reverts OS to linux so use `-D OS=android`
diff --git a/deps/v8/gypfiles/v8.gyp b/deps/v8/gypfiles/v8.gyp
index 93c9a4cfa12236..cf952fee63d8d9 100644
--- a/deps/v8/gypfiles/v8.gyp
+++ b/deps/v8/gypfiles/v8.gyp
@@ -361,6 +361,18 @@
             '../src/builtins/builtins-intl-gen.cc',
           ],
         }],
+        # Platforms that don't have Compare-And-Swap support need to link atomic
+        # library to implement atomic memory access
+        [ 'v8_current_cpu == "mips" or v8_current_cpu == "mipsel" or '
+          'v8_current_cpu == "mips64" or v8_current_cpu == "mips64el" or '
+          'v8_current_cpu == "ppc" or v8_current_cpu == "ppc64" or '
+          'v8_current_cpu == "s390" or v8_current_cpu == "s390x"',
+          {
+            'link_settings': {
+              'libraries': [ '-latomic', ],
+            },
+          },
+        ],
       ],
     }, # v8_initializers
     {