Disable the -fvisibility=hidden flag for tcmalloc

third_party/tcmalloc/tcmalloc.gyp

 # Copyright (c) 2009 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.
 
 {
   'targets': [
     {
       'target_name': 'tcmalloc',
       'type': '<(library)',
       'msvs_guid': 'C564F145-9172-42C3-BFCB-60FDEA124321',
@@ skipping 214 matching lines @@
             # jemalloc files
             'jemalloc/jemalloc.c',
             'jemalloc/jemalloc.h',
             'jemalloc/ql.h',
             'jemalloc/qr.h',
             'jemalloc/rb.h',
 
             # TODO(willchan): Unfork linux.
             'tcmalloc/src/malloc_hook.cc',
           ],
+          'cflags!': [
+            '-fvisibility=hidden',
+          ],
           'link_settings': {
             'ldflags': [
               # Don't let linker rip this symbol out, otherwise the heap&cpu
               # profilers will not initialize properly on startup.
               '-Wl,-uIsHeapProfilerRunning,-uProfilerStart',
               # Do the same for heap leak checker.
               '-Wl,-u_Z21InitialMallocHook_NewPKvj,-u_Z22InitialMallocHook_MMapPKvS0_jiiix,-u_Z22InitialMallocHook_SbrkPKvi',
               '-Wl,-u_Z21InitialMallocHook_NewPKvm,-u_Z22InitialMallocHook_MMapPKvS0_miiil,-u_Z22InitialMallocHook_SbrkPKvl',
             ],
           },
@@ skipping 46 matching lines @@
       ],
     }],
   ],
 }
 
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