1 files changed, 58 insertions, 0 deletions
diff --git a/deps/v8/build/linux/sysroot_scripts/find_incompatible_glibc_symbols.py b/deps/v8/build/linux/sysroot_scripts/find_incompatible_glibc_symbols.py
new file mode 100755
index 0000000000..426e17ff5d
--- /dev/null
+++ b/deps/v8/build/linux/sysroot_scripts/find_incompatible_glibc_symbols.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+# Copyright 2018 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Find incompatible symbols in glibc and output a list of replacements.
+"""
+
+import re
+import sys
+
+# This constant comes from https://crbug.com/580892
+MAX_ALLOWED_GLIBC_VERSION = [2, 17]
+
+
+def get_replacements(nm_file, max_allowed_glibc_version):
+  symbol_format = re.compile('\S+ \S+ ([^@]+)@@?(\S+)\n')
+  version_format = re.compile('GLIBC_[0-9\.]+')
+  symbols = {}
+  for line in nm_file:
+    m = re.match(symbol_format, line)
+    symbol = m.group(1)
+    version = m.group(2)
+    if not re.match(version_format, version):
+      continue
+    if symbol in symbols:
+      symbols[symbol].add(version)
+    else:
+      symbols[symbol] = set([version])
+
+  replacements = []
+  for symbol, versions in symbols.iteritems():
+    if len(versions) <= 1:
+      continue
+    versions_parsed = [[
+        int(part) for part in version.lstrip('GLIBC_').split('.')
+    ] for version in versions]
+    if (max(versions_parsed) > max_allowed_glibc_version and
+        min(versions_parsed) <= max_allowed_glibc_version):
+      # Use the newest allowed version of the symbol.
+      replacement_version_parsed = max([
+          version for version in versions_parsed
+          if version <= max_allowed_glibc_version
+      ])
+      replacement_version = 'GLIBC_' + '.'.join(
+          [str(part) for part in replacement_version_parsed])
+      replacements.append('__asm__(".symver %s, %s@%s");' %
+                          (symbol, symbol, replacement_version))
+  return sorted(replacements)
+
+
+if __name__ == '__main__':
+  replacements = get_replacements(sys.stdin, MAX_ALLOWED_GLIBC_VERSION)
+  if replacements:
+    print('// Chromium-specific hack.')
+    print('// See explanation in sysroot-creator.sh.')
+    for replacement in replacements:
+      print replacement