commit 6215ba804eb500f3e28b39088c73af3c4f4cd10a
author Timothy Gu <timothygu99@gmail.com> Fri Dec 18 06:41:43 2020
committer Commit Bot <commit-bot@chromium.org> Thu Dec 31 21:14:27 2020
tree c6c969db4f45c61714c4d8fbf01a5869bab37448
parent 3111783aa12b10719e242ec324f95d2340d9cef4

Add preprocessor support for additional architectures

- _M_ARM is used by Microsoft [1]
- __riscv and __riscv_xlen are defined by [2]
- __sparc and __sparc__ are documented at [3]
- __MIPSEB__, __PPC__, __PPC64__ are documented at [3] and used in
  Chromium's build/build_config.h [4]
  Note: Chromium assumes that all PowerPC architectures are 64-bit. This
  is in fact not true.

[1]: https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-160
[2]: https://github.com/riscv/riscv-toolchain-conventions/tree/feca4793566811993f67e008a449d794cfc48953#cc-preprocessor-definitions
[3]: https://sourceforge.net/p/predef/wiki/Architectures/
[4]: https://source.chromium.org/chromium/chromium/src/+/master:build/build_config.h;drc=e12bf2e5ff1eacb9aca3e9a26bdeebdbdad5965a

Change-Id: I7d0176c38102e5e4cf0fcbe9b06a3520a79b0d71
Bug: webrtc:12312
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/198241
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Timothy Gu <timothygu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#32897}

rtc_base/system/arch.h

diff --git a/rtc_base/system/arch.h b/rtc_base/system/arch.h
index ed216e6..be2367b 100644
--- a/rtc_base/system/arch.h
+++ b/rtc_base/system/arch.h
@@ -15,8 +15,9 @@
 #define RTC_BASE_SYSTEM_ARCH_H_
 
 // Processor architecture detection.  For more info on what's defined, see:
-//   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
-//   http://www.agner.org/optimize/calling_conventions.pdf
+//   https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
+//   https://www.agner.org/optimize/calling_conventions.pdf
+//   https://sourceforge.net/p/predef/wiki/Architectures/
 //   or with gcc, run: "echo | gcc -E -dM -"
 #if defined(_M_X64) || defined(__x86_64__)
 #define WEBRTC_ARCH_X86_FAMILY
@@ -32,17 +33,45 @@
 #define WEBRTC_ARCH_X86
 #define WEBRTC_ARCH_32_BITS
 #define WEBRTC_ARCH_LITTLE_ENDIAN
-#elif defined(__ARMEL__)
+#elif defined(_M_ARM) || defined(__ARMEL__)
 #define WEBRTC_ARCH_ARM_FAMILY
 #define WEBRTC_ARCH_32_BITS
 #define WEBRTC_ARCH_LITTLE_ENDIAN
-#elif defined(__MIPSEL__)
+#elif defined(__MIPSEL__) || defined(__MIPSEB__)
 #define WEBRTC_ARCH_MIPS_FAMILY
 #if defined(__LP64__)
 #define WEBRTC_ARCH_64_BITS
 #else
 #define WEBRTC_ARCH_32_BITS
 #endif
+#if defined(__MIPSEL__)
+#define WEBRTC_ARCH_LITTLE_ENDIAN
+#else
+#define WEBRTC_ARCH_BIG_ENDIAN
+#endif
+#elif defined(__PPC__)
+#if defined(__PPC64__)
+#define WEBRTC_ARCH_64_BITS
+#else
+#define WEBRTC_ARCH_32_BITS
+#endif
+#if defined(__LITTLE_ENDIAN__)
+#define WEBRTC_ARCH_LITTLE_ENDIAN
+#else
+#define WEBRTC_ARCH_BIG_ENDIAN
+#endif
+#elif defined(__sparc) || defined(__sparc__)
+#if __SIZEOF_LONG__ == 8
+#define WEBRTC_ARCH_64_BITS
+#else
+#define WEBRTC_ARCH_32_BITS
+#endif
+#define WEBRTC_ARCH_BIG_ENDIAN
+#elif defined(__riscv) && __riscv_xlen == 64
+#define WEBRTC_ARCH_64_BITS
+#define WEBRTC_ARCH_LITTLE_ENDIAN
+#elif defined(__riscv) && __riscv_xlen == 32
+#define WEBRTC_ARCH_32_BITS
 #define WEBRTC_ARCH_LITTLE_ENDIAN
 #elif defined(__pnacl__)
 #define WEBRTC_ARCH_32_BITS