[Linux sysroot] Workaround nm bug where symbol version gets printed 2x

BUG=1151959
R=penghuang

Change-Id: Iec5d9fa9db757aeb2c478d51dbc88d5804e513e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553706
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830258}

build/linux/sysroot_scripts/find_incompatible_glibc_symbols.py

@@ -16,13 +16,15 @@ 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)
+    # Some versions of nm have a bug where the version gets printed twice.
+    # Since the symbol may either be formatted like "name@@VERSION" or
+    # "name@@VERSION@@VERSION", handle both cases.
+    symver = line.split('@@')
+    symbol = symver[0].split(' ')[-1]
+    version = symver[-1]
     if not re.match(version_format, version):
       continue
     if symbol in symbols: