Added build option M32 for x86 builds on x64 platforms.

By using the new option one may compile a 32-bit version of the game on
64-bit platforms by specifying:
$ cmake -DM32=1

Of course this would require the gcc-multilib package and also 32-bit
versions of libSDL and FMod Ex shared objects.

CMakeLists.txt

@@ -135,9 +135,9 @@ if (NOT NO_SOUND)
 	)
 
 	if (NOT FMOD_LIBRARY)
-		message( STATUS "FModEx lib - ${FMOD_LIB_NAME} not found! Will compile without sound support." )
+		message(STATUS "FModEx lib - ${FMOD_LIB_NAME} not found! Will compile without sound support.")
 	else()
-		message( STATUS "Found FModEx lib at ${FMOD_LIBRARY}. Found FModEx DLL at ${FMOD_LIBRARY_SO_PATH}." )
+		message(STATUS "Found FModEx lib at ${FMOD_LIBRARY}. Found FModEx DLL at ${FMOD_LIBRARY_SO_PATH}.")
 
 		add_definitions(-DWITH_FMOD)
 		target_link_libraries(savagewheels ${FMOD_LIBRARY})
@@ -153,7 +153,7 @@ if (NOT NO_SOUND)
 	endif()
 
 else()
-	message( STATUS "NO_SOUND option found! Compiling without sound support ..." )
+	message(STATUS "NO_SOUND option found! Compiling without sound support ...")
 endif()
 
 ### additional defines
@@ -162,22 +162,24 @@ if (UNIX AND NOT WIN32)
 	add_definitions(-DLINUX_BUILD)
 endif()
 
-message( STATUS "Build type is ${CMAKE_BUILD_TYPE}" )
-
+message(STATUS "Build type is ${CMAKE_BUILD_TYPE}")
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")
 	add_definitions(-g -D_DEBUG -DDEBUG)
 else()
 	add_definitions(-O3 -DNDEBUG)
 endif()
 
-if (CMAKE_SIZEOF_VOID_P MATCHES "8")
+# set architecture
+
+if (CMAKE_SIZEOF_VOID_P MATCHES "8" AND NOT M32)
 	add_definitions(-DARCH_X64)
 	set(APP_ARCH "x64")
 	set(DEB_ARCH "amd64")
 else()
 	add_definitions(-DARCH_X86)
 	set(APP_ARCH "x86")
 	set(DEB_ARCH "i386")
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
 endif()
 
 ### configure a header file to pass some of the CMake settings to the source code

INSTALL

@@ -39,7 +39,7 @@ Extract the downloaded archive 'savagewheels-gamedata.tar.gz' into the bin/ fold
    	$ ./build.sh
 
    	d) Go to the 'release/' subfolder. Extract the produced archive file, 
-   	e.g., savagewheels-1.5.0-Linux-x64.tar.gz to your desired Games folder.
+   	e.g., savagewheels-1.5.0-Linux-x64.sh, to your (desired) Games folder.
 
 	e) Start the game run:
 	$ ./savagewheels  
@@ -63,11 +63,21 @@ Extract the downloaded archive 'savagewheels-gamedata.tar.gz' into the bin/ fold
 	c) Create the installation package with:
 	$ cpack
 
-	Debian/Ubuntu users may also run:
+3.2.1) Debian package
+
+	Debian/Ubuntu users may run:
 	$ cpack -G DEB
 	This will create a .deb package that you can install with, e.g.,
 	$ dpkg -i savagewheels-1.5.0-Linux-x64.deb
 
+3.2.2) Compile 32-bit version on 64-bit Linux
+
+	This requires that you have the 'gcc-multilib' package installed on your system.
+	You will also need to have 32-bit versions of libSDL.so and fmodex.so.
+
+	After all required packages are installed build the makefile by running:
+	$ cmake -G "Unix Makefiles" ../ -DCMAKE_BUILD_TYPE:STRING=Release -DM32=1
+
 4) Installation on Windows
 
 4.1) Requirements

README.md

@@ -13,8 +13,7 @@ All drivers have background stories which are revealed when playing the campaign
 
   * Please check [HISTORY](HISTORY) for latest changes.
   * Please check [INSTALL](INSTALL) for how to compile the game.
-  * Please check [LICENSE](LICENSE) for licensing (without sound fx).
-  * Please check LICENSE file in bin/sound folder for sound fx license.
+  * Please check [LICENSE](LICENSE) for licensing (without sound fx). Check LICENSE file in bin/sound folder for sound fx license.
 
 # Running the game