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Support Android x86 NDK build

On Android NDK, rand() is inlined function.  But, on our SSE optimization,
we need symbol for rand()

Change-Id: I42ab00e3255208ba95d7f9b9a8a3605ff58da8e1

--- /dev/null

+++ b/vp8/common/x86/postproc_x86.c

@@ -1,0 +1,21 @@

+/*

+ *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+ *

+ *  Use of this source code is governed by a BSD-style license

+ *  that can be found in the LICENSE file in the root of the source

+ *  tree. An additional intellectual property rights grant can be found

+ *  in the file PATENTS.  All contributing project authors may

+ *  be found in the AUTHORS file in the root of the source tree.

+ */

+

+/* On Android NDK, rand is inlined function, but postproc needs rand symbol */

+#if defined(__ANDROID__)

+#define rand __rand

+#include <stdlib.h>

+#undef rand

+

+extern int rand(void)

+{

+  return __rand();

+}

+#endif

--- a/vp8/vp8_common.mk

+++ b/vp8/vp8_common.mk

@@ -93,6 +93,7 @@

 VP8_COMMON_SRCS-$(HAVE_SSE2) += common/x86/iwalsh_sse2.asm

 VP8_COMMON_SRCS-$(HAVE_SSSE3) += common/x86/subpixel_ssse3.asm

 ifeq ($(CONFIG_POSTPROC),yes)

+VP8_COMMON_SRCS-$(ARCH_X86)$(ARCH_X86_64) += common/x86/postproc_x86.c

 VP8_COMMON_SRCS-$(HAVE_MMX) += common/x86/postproc_mmx.asm

 VP8_COMMON_SRCS-$(HAVE_SSE2) += common/x86/postproc_sse2.asm

 endif

-- 

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