https://bugs.gentoo.org/953436#c5
--- a/third_party/blink/renderer/build/scripts/gperf.py
+++ b/third_party/blink/renderer/build/scripts/gperf.py
@@ -28,24 +28,6 @@
             stdout=subprocess.PIPE,
             universal_newlines=True)
         gperf_output = gperf.communicate(gperf_input)[0]
-        # Massage gperf output to be more palatable for modern compilers.
-        # TODO(thakis): Upstream these to gperf so we don't need massaging.
-        # `register` is deprecated in C++11 and removed in C++17, so remove
-        # it from gperf's output.
-        # https://savannah.gnu.org/bugs/index.php?53028
-        gperf_output = re.sub(r'\bregister ', '', gperf_output)
-        # -Wimplicit-fallthrough needs an explicit fallthrough statement,
-        # so replace gperf's /*FALLTHROUGH*/ comment with the statement.
-        # https://savannah.gnu.org/bugs/index.php?53029
-        gperf_output = gperf_output.replace('/*FALLTHROUGH*/',
-                                            '  [[fallthrough]];')
-        # -Wpointer-to-int-cast warns about casting pointers to smaller ints
-        # Replace {(int)(long)&(foo), bar} with
-        # {static_cast<int>(reinterpret_cast<uintptr_t>(&(foo)), bar}
-        gperf_output = re.sub(
-            r'\(int\)\(long\)(.*?),',
-            r'static_cast<int>(reinterpret_cast<uintptr_t>(\1)),',
-            gperf_output)
         script = 'third_party/blink/renderer/build/scripts/gperf.py'
         return '// Generated by %s\n' % script + gperf_output
     except OSError: