Contribution of PowerPC port.

src/base/build_config.h

 // Copyright 2014 the V8 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.
 
 #ifndef V8_BASE_BUILD_CONFIG_H_
 #define V8_BASE_BUILD_CONFIG_H_
 
 #include "include/v8config.h"
 
 // Processor architecture detection.  For more info on what's defined, see:
@@ skipping 30 matching lines @@
 #define V8_HOST_CAN_READ_UNALIGNED 1
 #elif defined(__ARMEL__)
 #define V8_HOST_ARCH_ARM 1
 #define V8_HOST_ARCH_32_BIT 1
 #elif defined(__mips64)
 #define V8_HOST_ARCH_MIPS64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__MIPSEB__) || defined(__MIPSEL__)
 #define V8_HOST_ARCH_MIPS 1
 #define V8_HOST_ARCH_32_BIT 1
+#elif defined(__PPC__) || defined(_ARCH_PPC)
+#define V8_HOST_ARCH_PPC 1
+#if defined(__PPC64__) || defined(_ARCH_PPC64)
+#define V8_HOST_ARCH_64_BIT 1
+#else
+#define V8_HOST_ARCH_32_BIT 1
+#endif
 #else
 #error "Host architecture was not detected as supported by v8"
 #endif
 
 #if defined(__ARM_ARCH_7A__) || \
     defined(__ARM_ARCH_7R__) || \
     defined(__ARM_ARCH_7__)
 # define CAN_USE_ARMV7_INSTRUCTIONS 1
 # ifndef CAN_USE_VFP3_INSTRUCTIONS
 #  define CAN_USE_VFP3_INSTRUCTIONS
 # endif
 #endif
 
 
 // Target architecture detection. This may be set externally. If not, detect
 // in the same way as the host architecture, that is, target the native
 // environment as presented by the compiler.
-#if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_X87 && \
+#if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_X87 &&   \
     !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_MIPS && \
-    !V8_TARGET_ARCH_MIPS64
+    !V8_TARGET_ARCH_MIPS64 && !V8_TARGET_ARCH_PPC
 #if defined(_M_X64) || defined(__x86_64__)
 #define V8_TARGET_ARCH_X64 1
 #elif defined(_M_IX86) || defined(__i386__)
 #define V8_TARGET_ARCH_IA32 1
 #elif defined(__AARCH64EL__)
 #define V8_TARGET_ARCH_ARM64 1
 #elif defined(__ARMEL__)
 #define V8_TARGET_ARCH_ARM 1
 #elif defined(__mips64)
 #define V8_TARGET_ARCH_MIPS64 1
@@ skipping 16 matching lines @@
 #endif
 #endif
 #elif V8_TARGET_ARCH_ARM
 #define V8_TARGET_ARCH_32_BIT 1
 #elif V8_TARGET_ARCH_ARM64
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_MIPS
 #define V8_TARGET_ARCH_32_BIT 1
 #elif V8_TARGET_ARCH_MIPS64
 #define V8_TARGET_ARCH_64_BIT 1
+#elif V8_TARGET_ARCH_PPC
+#if V8_TARGET_ARCH_PPC64
+#define V8_TARGET_ARCH_64_BIT 1
+#else
+#define V8_TARGET_ARCH_32_BIT 1
+#endif
 #elif V8_TARGET_ARCH_X87
 #define V8_TARGET_ARCH_32_BIT 1
 #else
 #error Unknown target architecture pointer size
 #endif
 
 // Check for supported combinations of host and target architectures.
 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
 #error Target architecture ia32 is only supported on ia32 host
 #endif
@@ skipping 30 matching lines @@
 #elif V8_TARGET_ARCH_MIPS
 #if defined(__MIPSEB__)
 #define V8_TARGET_BIG_ENDIAN 1
 #else
 #define V8_TARGET_LITTLE_ENDIAN 1
 #endif
 #elif V8_TARGET_ARCH_MIPS64
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif V8_TARGET_ARCH_X87
 #define V8_TARGET_LITTLE_ENDIAN 1
+#elif V8_TARGET_ARCH_PPC_LE
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif V8_TARGET_ARCH_PPC_BE
+#define V8_TARGET_BIG_ENDIAN 1
 #else
 #error Unknown target architecture endianness
 #endif
 
 #if V8_OS_MACOSX || defined(__FreeBSD__) || defined(__OpenBSD__)
 #define USING_BSD_ABI
 #endif
 
 // Number of bits to represent the page size for paged spaces. The value of 20
 // gives 1Mb bytes per page.
 const int kPageSizeBits = 20;
 
 #endif  // V8_BASE_BUILD_CONFIG_H_