From 7e4858db2a537b4777073814157ce17a90740fab Mon Sep 17 00:00:00 2001
From: XMRig <support@xmrig.com>
Date: Mon, 4 Feb 2019 02:23:05 +0700
Subject: [PATCH] Allow override ARM arch detection and support for ARMv8
 without crypto extension.

---
 CMakeLists.txt    |  1 +
 cmake/cpu.cmake   | 48 ++++++++++++++++++++++++++++++++---------------
 cmake/flags.cmake |  8 ++++----
 3 files changed, 38 insertions(+), 19 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d0042afe..cd5530188 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ option(WITH_DEBUG_LOG "Enable debug log output" OFF)
 option(WITH_TLS       "Enable OpenSSL support" ON)
 option(WITH_ASM       "Enable ASM PoW implementations" ON)
 option(BUILD_STATIC   "Build static binary" OFF)
+option(ARM_TARGET    "Force use specific ARM target 8 or 7" 0)
 
 include (CheckIncludeFile)
 include (cmake/cpu.cmake)
diff --git a/cmake/cpu.cmake b/cmake/cpu.cmake
index 96e61e2b6..2fdebad81 100644
--- a/cmake/cpu.cmake
+++ b/cmake/cpu.cmake
@@ -7,19 +7,37 @@ if (CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|AMD64)$")
     add_definitions(/DRAPIDJSON_SSE2)
 endif()
 
-
-if (CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64)$")
-    set(XMRIG_ARM     ON)
-    set(XMRIG_ARMv8   ON)
-    set(WITH_LIBCPUID OFF)
-
-    add_definitions(/DXMRIG_ARM)
-    add_definitions(/DXMRIG_ARMv8)
-elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^(armv7|armv7f|armv7s|armv7k|armv7-a|armv7l)$")
-    set(XMRIG_ARM     ON)
-    set(XMRIG_ARMv7   ON)
-    set(WITH_LIBCPUID OFF)
-
-    add_definitions(/DXMRIG_ARM)
-    add_definitions(/DXMRIG_ARMv7)
+if (NOT ARM_TARGET)
+    if (CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64|armv8-a)$")
+        set(ARM_TARGET 8)
+    elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^(armv7|armv7f|armv7s|armv7k|armv7-a|armv7l)$")
+        set(ARM_TARGET 7)
+    endif()
+endif()
+
+if (ARM_TARGET AND ARM_TARGET GREATER 6)
+    set(XMRIG_ARM     ON)
+    set(WITH_LIBCPUID OFF)
+    add_definitions(/DXMRIG_ARM)
+
+    message(STATUS "Use ARM_TARGET=${ARM_TARGET} (${CMAKE_SYSTEM_PROCESSOR})")
+
+    include(CheckCXXCompilerFlag)
+
+    if (ARM_TARGET EQUAL 8)
+        set(XMRIG_ARMv8 ON)
+        add_definitions(/DXMRIG_ARMv8)
+
+        CHECK_CXX_COMPILER_FLAG(-march=armv8-a+crypto XMRIG_ARM_CRYPTO)
+
+        if (XMRIG_ARM_CRYPTO)
+            add_definitions(/DXMRIG_ARM_CRYPTO)
+            set(ARM8_CXX_FLAGS "-march=armv8-a+crypto")
+        else()
+            set(ARM8_CXX_FLAGS "-march=armv8-a")
+        endif()
+    elseif (ARM_TARGET EQUAL 7)
+        set(XMRIG_ARMv7 ON)
+        add_definitions(/DXMRIG_ARMv7)
+    endif()
 endif()
diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index 8bc148042..3989cb71b 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -19,8 +19,8 @@ if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Ofast -s")
 
     if (XMRIG_ARMv8)
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8-a+crypto")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8-a+crypto -flax-vector-conversions")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ARM8_CXX_FLAGS}")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARM8_CXX_FLAGS} -flax-vector-conversions")
     elseif (XMRIG_ARMv7)
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=neon")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=neon -flax-vector-conversions")
@@ -60,8 +60,8 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES Clang)
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Ofast -funroll-loops -fmerge-all-constants")
 
     if (XMRIG_ARMv8)
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8-a+crypto")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8-a+crypto")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ARM8_CXX_FLAGS}")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARM8_CXX_FLAGS}")
     elseif (XMRIG_ARMv7)
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=neon -march=${CMAKE_SYSTEM_PROCESSOR}")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=neon -march=${CMAKE_SYSTEM_PROCESSOR}")