From 7ba9efe31afb16c025ab2277774be0d8cfeb276c Mon Sep 17 00:00:00 2001
From: barracuda156 <vital.had@gmail.com>
Date: Thu, 22 Jun 2023 00:38:48 +0800
Subject: [PATCH] Allow building for 32-bit and PPC

--- src/is_supported_platform.h.orig	2025-10-08 03:57:41.000000000 +0800
+++ src/is_supported_platform.h	2025-10-22 08:02:20.000000000 +0800
@@ -21,7 +21,7 @@
 // WARNING: do not #include anything in here!
 
 #if !defined(__BYTE_ORDER__) || __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
-#error "Unfortunately we only work on litte-endian systems."
+#warning "Big-endian systems are not supported by upstream."
 #endif
 
 #if (defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64))
@@ -36,21 +36,21 @@
 #define DT_SUPPORTED_ARMv8A 0
 #endif
 
-#if defined(__PPC64__)
-#define DT_SUPPORTED_PPC64 1
+#if defined(__PPC64__) && (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
+#define DT_SUPPORTED_PPC64LE 1
 #else
-#define DT_SUPPORTED_PPC64 0
+#define DT_SUPPORTED_PPC64LE 0
 #endif
 
 #if DT_SUPPORTED_X86 && DT_SUPPORTED_ARMv8A
 #error "Looks like hardware platform detection macros are broken?"
 #endif
 
-#if !DT_SUPPORTED_X86 && !DT_SUPPORTED_ARMv8A && !DT_SUPPORTED_PPC64
-#error "Unfortunately we only work on amd64, ARMv8-A and PPC64 (64-bit little-endian only)."
+#if !DT_SUPPORTED_X86 && !DT_SUPPORTED_ARMv8A && !DT_SUPPORTED_PPC64LE
+#warning "This platform is not supported by upstream."
 #endif
 
-#undef DT_SUPPORTED_PPC64
+#undef DT_SUPPORTED_PPC64LE
 #undef DT_SUPPORTED_ARMv8A
 #undef DT_SUPPORTED_X86
 
@@ -61,7 +61,7 @@
 
 // double check for 32-bit architecture
 #if defined(__SIZEOF_POINTER__) && __SIZEOF_POINTER__ < 8
-#error "Unfortunately we only work on the 64-bit architectures amd64, ARMv8-A and PPC64."
+#warning "32-bit systems are not supported by upstream."
 #endif
 
 // clang-format off
@@ -69,4 +69,3 @@
 // vim: shiftwidth=2 expandtab tabstop=2 cindent
 // kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
 // clang-format on
-

--- src/CMakeLists.txt	2023-06-30 14:13:18.000000000 +0800
+++ src/CMakeLists.txt	2024-04-29 17:27:08.000000000 +0800
@@ -226,7 +226,8 @@
 
 set(SOURCES ${SOURCE_FILES} ${HEADER_FILES})
 
-if(CMAKE_SYSTEM_PROCESSOR STREQUAL "ppc64le")
+# There is nothing LE there.
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc|powerpc")
   include_directories(${CMAKE_CURRENT_SOURCE_DIR}/ppc64le)
 endif()
 
@@ -551,6 +552,8 @@
   add_definitions(-DHAVE_OPENCL=1)
 endif(USE_OPENCL)
 
+# The check below does not work correctly, and this builtin not relevant anyway.
+if(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "ppc|powerpc")
 # Check for __builtin_cpu_supports here due to a bug in clang/llvm. LLVM uses
 # libgcc to provide the symbols, so if clang wasn't compiled with libgcc, the
 # compiler will say it's available; however the linker cannot find the symbols.
@@ -565,6 +568,7 @@
   add_definitions(-DHAVE_BUILTIN_CPU_SUPPORTS=1)
 endif(HAVE_BUILTIN_CPU_SUPPORTS)
 MESSAGE(STATUS "Does the compiler support __builtin_cpu_supports(): ${HAVE_BUILTIN_CPU_SUPPORTS}")
+endif()
 
 check_c_source_compiles("
 static __thread int tls;