Fixes for Darwin PowerPC

absl/debugging/internal/examine_stack.cc

@@ -223,6 +223,12 @@ void* GetProgramCounter(void* const vuc) {
 #else
     return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.rip);
 #endif
+#elif defined(__ppc__) || defined(__ppc64__)
+#if __DARWIN_UNIX03
+    return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__srr0);
+#else
+    return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.srr0);
+#endif
 #endif
   }
 #elif defined(__akaros__)

absl/random/internal/platform.h

@@ -67,8 +67,8 @@
 #define ABSL_ARCH_AARCH64
 #elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM)
 #define ABSL_ARCH_ARM
-#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
-    defined(__ppc__) || defined(__PPC__)
+#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__ppc64__) || \
+     defined(__powerpc__) || defined(__PPC__) || defined(__ppc__) || defined(__POWERPC__)
 #define ABSL_ARCH_PPC
 #else
 // Unsupported architecture.
@@ -105,9 +105,11 @@
 
 #elif defined(ABSL_ARCH_PPC)
 
+#if defined(__APPLE__) // G4 and G5 ISA have Altivec, but do not support VSX and CRYPTO
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 0
 // Rely on VSX and CRYPTO extensions for vcipher on PowerPC.
-#if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
-    defined(__CRYPTO__)
+#elif (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && defined(__CRYPTO__)
 #undef ABSL_HAVE_ACCELERATED_AES
 #define ABSL_HAVE_ACCELERATED_AES 1
 #endif
@@ -151,6 +153,10 @@
 // (This captures a lot of Android configurations.)
 #undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
 #define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__APPLE__) && defined(ABSL_ARCH_PPC)
+// Darwin PPC
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
 #endif
 
 // NaCl does not allow dispatch.

absl/random/internal/randen_detect.cc

@@ -31,14 +31,15 @@
 
 #if defined(ABSL_ARCH_X86_64)
 #define ABSL_INTERNAL_USE_X86_CPUID
-#elif defined(ABSL_ARCH_PPC) || defined(ABSL_ARCH_ARM) || \
-    defined(ABSL_ARCH_AARCH64)
+#elif defined(ABSL_ARCH_PPC) || defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
 #if defined(__ANDROID__)
 #define ABSL_INTERNAL_USE_ANDROID_GETAUXVAL
 #define ABSL_INTERNAL_USE_GETAUXVAL
 #elif defined(__linux__) && defined(ABSL_HAVE_GETAUXVAL)
 #define ABSL_INTERNAL_USE_LINUX_GETAUXVAL
 #define ABSL_INTERNAL_USE_GETAUXVAL
+#elif defined(__APPLE__) && defined(ABSL_ARCH_PPC)
+#define ABSL_INTERNAL_USE_PPC_CPUINFO
 #endif
 #endif
 
@@ -56,6 +57,11 @@ static void __cpuid(int cpu_info[4], int info_type) {
 #endif
 #endif  // ABSL_INTERNAL_USE_X86_CPUID
 
+#if defined(ABSL_INTERNAL_USE_PPC_CPUINFO)
+#include <mach/mach.h>
+#include <mach/machine.h>
+#endif // ABSL_INTERNAL_USE_PPC_CPUINFO
+
 // On linux, just use the c-library getauxval call.
 #if defined(ABSL_INTERNAL_USE_LINUX_GETAUXVAL)