--- src/mongo/platform/atomic_word.h
+++ src/mongo/platform/atomic_word.h	2024-04-01 06:07:37.000000000 +0800
@@ -125,8 +125,9 @@
     }
 
 protected:
-    // At least with GCC 10, this assertion fails for small types like bool.
-#if !defined(__riscv)
+    // At least with GCC 10, this assertion fails for small types like bool on RISC-V.
+    // It will fail for 8-byte types on ppc.
+#if !defined(__riscv) && !defined(__ppc__)
     MONGO_STATIC_ASSERT(std::atomic<WordType>::is_always_lock_free);  // NOLINT
 #endif
 

--- site_scons/site_tools/libtool.py
+++ site_scons/site_tools/libtool.py	2024-04-01 07:02:00.000000000 +0800
@@ -27,7 +27,7 @@
 
     env["AR"] = "libtool"
     env["ARCOM"] = "$AR -static -o $TARGET $ARFLAGS $SOURCES"
-    env["ARFLAGS"] = ["-s", "-no_warning_for_no_symbols"]
+    env["ARFLAGS"] = "-s"
 
     # Disable running ranlib, since we added 's' above
     env["RANLIBCOM"] = ""


--- src/mongo/db/exec/sbe/values/value.h
+++ src/mongo/db/exec/sbe/values/value.h	2024-04-01 08:53:40.000000000 +0800
@@ -357,7 +357,9 @@
 
     if constexpr (std::is_pointer_v<T>) {
         // Casting from integer value to pointer is OK.
-        static_assert(sizeof(Value) == sizeof(T));
+        #ifndef __ppc__
+            static_assert(sizeof(Value) == sizeof(T));
+        #endif
         return reinterpret_cast<T>(in);
     } else if constexpr (std::is_integral_v<T>) {
         // Values are converted to native integer types using static_cast. If sizeof(T) is less
@@ -365,7 +367,9 @@
         static_assert(sizeof(Value) >= sizeof(T));
         return static_cast<T>(in);
     } else if constexpr (std::is_same_v<Decimal128, T>) {
-        static_assert(sizeof(Value) == sizeof(T*));
+        #ifndef __ppc__
+            static_assert(sizeof(Value) == sizeof(T*));
+        #endif
         return readDecimal128FromMemory(ConstDataView{getRawPointerView(in)});
     } else {
         static_assert(sizeof(Value) >= sizeof(T));


--- src/mongo/platform/process_id.cpp
+++ src/mongo/platform/process_id.cpp	2024-04-01 10:03:48.000000000 +0800
@@ -48,6 +48,10 @@
 #include <limits>
 #include <sstream>
 
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+#endif
+
 #include "mongo/base/static_assert.h"
 #include "mongo/util/assert_util.h"
 
@@ -74,7 +78,11 @@
 inline NativeProcessId getCurrentNativeThreadId() {
     // macOS deprecated syscall in 10.12.
     uint64_t tid;
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 1060 || defined(__POWERPC__)
+    tid = pthread_mach_thread_np(pthread_self());
+#else
     invariant(::pthread_threadid_np(NULL, &tid) == 0);
+#endif
     return tid;
 }
 #elif __FreeBSD__


--- src/mongo/platform/pause.h
+++ src/mongo/platform/pause.h	2024-04-03 00:45:26.000000000 +0800
@@ -51,7 +51,11 @@
 
 #define MONGO_YIELD_CORE_FOR_SMT() _mm_pause()
 
-#elif defined(__PPC64__) || defined(PPC64)
+#elif defined(__POWERPC__) && defined(__APPLE__)
+
+#define MONGO_YIELD_CORE_FOR_SMT() __asm__ volatile("or r27,r27,r27" ::: "memory")
+
+#elif defined(__PPC64__) || defined(PPC64) || defined(__powerpc64__)
 
 /* ori 0,0,0 is the PPC64 noop instruction */
 #define MONGO_YIELD_CORE_FOR_SMT() __asm__ volatile("ori 0,0,0" ::: "memory")


--- src/third_party/wiredtiger/src/include/gcc.h
+++ src/third_party/wiredtiger/src/include/gcc.h	2024-04-03 03:35:42.000000000 +0800
@@ -207,9 +207,13 @@
         __asm__ volatile("sync; ld $0, %0" ::"m"(*(long *)0xffffffff80000000) : "memory"); \
     } while (0)
 
-#elif defined(__PPC64__) || defined(PPC64)
+#elif defined(__PPC64__) || defined(PPC64) || defined(__powerpc64__) || defined(__POWERPC__)
+#ifdef __APPLE__
+#define WT_PAUSE() __asm__ volatile("or r27,r27,r27" ::: "memory")
+#else
 /* ori 0,0,0 is the PPC64 noop instruction */
 #define WT_PAUSE() __asm__ volatile("ori 0,0,0" ::: "memory")
+#endif
 #define WT_FULL_BARRIER()                      \
     do {                                       \
         __asm__ volatile("sync" ::: "memory"); \


--- src/third_party/IntelRDFPMathLib20U1/SConscript
+++ src/third_party/IntelRDFPMathLib20U1/SConscript	2024-04-01 06:10:07.000000000 +0800
@@ -320,6 +320,16 @@
 elif processor == 's390x':
     cpp_defines['s390x'] = '1'
     cpp_defines['BID_BIG_ENDIAN'] = '1'
+# Darwin ppc64 build is untested
+elif processor == 'ppc64':
+    cpp_defines['efi2'] = '1'
+    cpp_defines['EFI2'] = '1'
+    cpp_defines['BID_BIG_ENDIAN'] = '1'
+# Using 32-bit big endian
+# TODO: do we need IA32 defines too?
+elif processor == 'ppc':
+    cpp_defines['D32'] = '1'
+    cpp_defines['BID_BIG_ENDIAN'] = '1'
 else:
     assert False, "Unsupported architecture: " + processor
 

--- src/third_party/wiredtiger/build_darwin/wiredtiger_config.h
+++ src/third_party/wiredtiger/build_darwin/wiredtiger_config.h	2024-04-03 06:53:56.000000000 +0800
@@ -129,15 +129,7 @@
 
 /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
    significant byte first (like Motorola and SPARC, unlike Intel). */
-#if defined AC_APPLE_UNIVERSAL_BUILD
-# if defined __BIG_ENDIAN__
-#  define WORDS_BIGENDIAN 1
-# endif
-#else
-# ifndef WORDS_BIGENDIAN
-/* #  undef WORDS_BIGENDIAN */
-# endif
-#endif
+#define WORDS_BIGENDIAN 1
 
 /* Default alignment of buffers used for I/O */
 #define WT_BUFFER_ALIGNMENT_DEFAULT 0