From 28e643c384fd7f978fb7a6fcc10b30b106b18c68 Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Sun, 25 May 2014 20:52:52 -0500
Subject: [PATCH] Add a Cmake generic build option and remove x86_32 build
 capabilities.

Adds the ability to build our generic build option without manually enabling it in the cmake file.
If trying to build on a x86_32 host, throw a fatal error but say that a binary can be built as a generic build if one wants.
---
 CMakeLists.txt | 61 ++++++++++++++++++++++++++------------------------
 1 file changed, 32 insertions(+), 29 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1f5f42adc..e8e2b8d517 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ option(USE_UPNP "Enables UPnP port mapping support" ON)
 option(DISABLE_WX "Disable wxWidgets (use CLI interface)" OFF)
 option(ENABLE_PCH "Use PCH to speed up compilation" ON)
 option(ENABLE_LTO "Enables Link Time Optimization" OFF)
+option(ENABLE_GENERIC "Enables generic build that should run on any little-endian host" OFF)
 
 option(OPENMP "Enable OpenMP parallelization" ON)
 option(ENCODE_FRAMEDUMPS "Encode framedumps in AVI format" ON)
@@ -134,37 +135,39 @@ else()
 	add_definitions(-D_ARCH_32=1)
 endif()
 
-if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^x86" OR 
-   ${CMAKE_SYSTEM_PROCESSOR} MATCHES "i.86" OR
-   ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-	add_definitions(-msse2)
-	set(_M_X86 1)
-	add_definitions(-D_M_X86=1)
-	if(_ARCH_64)
-		set(_M_X86_64 1)
-		add_definitions(-D_M_X86_64=1)
+if(NOT ENABLE_GENERIC)
+	if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^x86" OR
+	   ${CMAKE_SYSTEM_PROCESSOR} MATCHES "i.86" OR
+	   ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+		if(_ARCH_64)
+			set(_M_X86 1)
+			set(_M_X86_64 1)
+			add_definitions(-D_M_X86=1 -D_M_X86_64=1 -msse2)
+		else()
+			message(FATAL_ERROR "x86_32 is an unsupported platform. Enable generic build if you really want a JIT-less binary.")
+		endif()
+	elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^arm")
+		# This option only applies to 32bit ARM
+		set(_M_ARM 1)
+		set(_M_ARM_32 1)
+		add_definitions(-D_M_ARM=1 -D_M_ARM_32=1)
+		# ARMv7 isn't a generic build anymore, this shouldn't need to be defined
+		set(ENABLE_GENERIC 1)
+		if(${ANDROID_NDK_ABI_NAME} MATCHES "armeabi-v7a")
+			add_definitions(-marm -march=armv7-a)
+		endif()
+	elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
+		# This option only applies to 64bit ARM
+		set(_M_ARM 1)
+		set(_M_ARM_64 1)
+		add_definitions(-D_M_ARM=1 -D_M_ARM_64=1)
+		set(ENABLE_GENERIC 1)
 	else()
-		set(_M_X86_32 1)
-		add_definitions(-D_M_X86_32=1)
+		set(ENABLE_GENERIC 1)
 	endif()
-elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^arm")
-	# This option only applies to 32bit ARM
-	set(_M_ARM 1)
-	set(_M_ARM_32 1)
-	add_definitions(-D_M_ARM=1 -D_M_ARM_32=1)
-	set(_M_GENERIC 1)
-	add_definitions(-D_M_GENERIC=1)
-	if(${ANDROID_NDK_ABI_NAME} MATCHES "armeabi-v7a")
-		add_definitions(-marm -march=armv7-a)
-	endif()
-elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
-	# This option only applies to 64bit ARM
-	set(_M_ARM 1)
-	set(_M_ARM_64 1)
-	add_definitions(-D_M_ARM=1 -D_M_ARM_64=1)
-	set(_M_GENERIC 1)
-	add_definitions(-D_M_GENERIC=1)
-else()
+endif()
+
+if(ENABLE_GENERIC)
 	message("Warning! Building generic build!")
 	set(_M_GENERIC 1)
 	add_definitions(-D_M_GENERIC=1)