Android WebView: don't define sincos.

base/os_compat_android.cc

 // Copyright (c) 2012 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.
 
 #include "base/os_compat_android.h"
 
 #include <asm/unistd.h>
 #include <errno.h>
 #include <math.h>
 #include <sys/stat.h>
@@ skipping 57 matching lines @@
 // library provided by the NDK for API level 9. When the optimization kicks
 // in, it makes the final build fail with a puzzling message (puzzling
 // because 'sincos' doesn't appear anywhere in the sources!).
 //
 // To solve this, we provide our own implementation of the sincos() function
 // and related friends. Note that we must also explicitely tell GCC to disable
 // optimizations when generating these. Otherwise, the generated machine code
 // for each function would simply end up calling itself, resulting in a
 // runtime crash due to stack overflow.
 //
-#if defined(__GNUC__) && !defined(__clang__)
+#if defined(__GNUC__) && !defined(__clang__) && \
+    !defined(ANDROID_SINCOS_PROVIDED)
 
 // For the record, Clang does not support the 'optimize' attribute.
 // In the unlikely event that it begins performing this optimization too,
 // we'll have to find a different way to achieve this. NOTE: Tested with O1
 // which still performs the optimization.
 //
 #define GCC_NO_OPTIMIZE  __attribute__((optimize("O0")))
 
 GCC_NO_OPTIMIZE
 void sincos(double angle, double* s, double *c) {
@@ skipping 72 matching lines @@
       // The directory doesn't exist, but an error occured
       return NULL;
     }
   }
 
   // We reached the max number of tries.
   return NULL;
 }
 
 }  // extern "C"