Create a build_config header file.

src/include/nacl_defines.h

Index: src/include/nacl_defines.h
diff --git a/src/include/nacl_defines.h b/src/include/nacl_defines.h
new file mode 100644
index 0000000000000000000000000000000000000000..09b49076fbbf7dd3c1f2c1e7357a866f8de78e29
--- /dev/null
+++ b/src/include/nacl_defines.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2014 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+

[Mark Seaborn, 2014/12/11 16:11:40]

Could we call this "build_config.h"?  Firstly, to match Chromium.  Secondly,
because "nacl_defines.h" is a bit too generic.

[teravest, 2014/12/15 20:08:36]

Done.

+#ifndef NATIVE_CLIENT_SRC_INCLUDE_NACL_DEFINES_H_
+#define NATIVE_CLIENT_SRC_INCLUDE_NACL_DEFINES_H_ 1
+
+#if !defined(NACL_WINDOWS) && !defined(NACL_LINUX) && !defined(NACL_OSX)

[Mark Seaborn, 2014/12/11 16:11:41]

Can you add a TODO to remove this when the Gyp build stops defining these?

[teravest, 2014/12/15 20:08:36]

Done.

+
+#if defined(_WIN32)

[Mark Seaborn, 2014/12/11 16:11:40]

Can you indent like this?
#if defined(_WIN32)
# define NACL_WINDOWS 1
#else
...

[teravest, 2014/12/15 20:08:36]

Done.

+#define NACL_WINDOWS 1
+#else
+#define NACL_WINDOWS 0
+#endif
+
+#if defined(__linux__)
+#define NACL_LINUX 1
+#else
+#define NACL_LINUX 0
+#endif
+
+#if defined(__APPLE__)
+#define NACL_OSX 1
+#else
+#define NACL_OSX 0
+#endif
+
+#endif
+
+#if !defined(NACL_ANDROID)
+#if defined(ANDROID)
+#define NACL_ANDROID 1
+#else
+#define NACL_ANDROID 0
+#endif
+#endif
+
+#if defined(NACL_BUILD_ARCH) && !defined(NACL_BUILD_SUBARCH)

[Mark Seaborn, 2014/12/11 16:11:40]

Similar TODO for NACL_BUILD_(SUB)ARCH

[teravest, 2014/12/15 20:08:36]

Done.

+#error Please define both NACL_BUILD_ARCH and NACL_BUILD_SUBARCH.
+#elif !defined(NACL_BUILD_ARCH) && defined(NACL_BUILD_SUBARCH)
+#error Please define both NACL_BUILD_ARCH and NACL_BUILD_SUBARCH.
+#endif
+
+
+#if !defined(NACL_BUILD_ARCH)
+
+#if defined(_M_X64) || defined(__x86_64__)
+#define NACL_BUILD_ARCH x86
+#define NACL_BUILD_SUBARCH 64
+#endif
+
+#if defined(_M_IX86) || defined(__i386__)
+#define NACL_BUILD_ARCH x86
+#define NACL_BUILD_SUBARCH 32
+#endif
+
+/* TODO(teravest): Handle __aarch64__? */

[Mark Seaborn, 2014/12/11 16:11:41]

This TODO is not really needed since we don't support AArch64.

[teravest, 2014/12/15 20:08:36]

Removed.

+#if defined(__ARMEL__)
+#define NACL_BUILD_ARCH arm
+#define NACL_BUILD_SUBARCH 32
+#endif
+
+#if defined((__MIPSEL__)

[Mark Seaborn, 2014/12/11 16:11:40]

Stray extra "(" here

[teravest, 2014/12/15 20:08:36]

Done.

+#define NACL_BUILD_ARCH mips
+#define NACL_BUILD_SUBARCH 32
+#endif
+
+#endif  /* !defined(NACL_BUILD_ARCH) */
+
+#if !defined(NACL_BUILD_ARCH)
+#error NACL_BUILD_ARCH not defined.
+#endif
+
+#if !defined(NACL_BUILD_SUBARCH)
+#error NACL_BUILD_SUBARCH not defined.
+#endif
+
+#endif  /* NATIVE_CLIENT_SRC_PUBLIC_NACL_DEFINES_H_ */