Add hellfire cmake target

CMakeLists.txt

@@ -15,6 +15,7 @@ option(NIGHTLY_BUILD "Enable options for nightly build" OFF)
 option(USE_SDL1 "Use SDL1.2 instead of SDL2" OFF)
 option(NONET "Disable network" OFF)
 option(RUN_TESTS "Build and run tests" OFF)
+option(HELLFIRE "Build hellfire version" OFF)
 RELEASE_OPTION(CPACK "Configure CPack")
 
 
@@ -337,6 +338,10 @@ if(RUN_TESTS)
     SourceT/scrollrt_test.cpp)
 endif()
 
+if(HELLFIRE)
+  add_definitions(-DHELLFIRE)
+endif()
+
 add_executable(${BIN_TARGET} WIN32 MACOSX_BUNDLE ${devilutionx_SRCS})
 
 # Copy the font to the build directory to it works from the build directory

README.md

@@ -273,6 +273,7 @@ select Icons -> Information in the top menu.
 - `-DSPAWN=ON` build the shareware version, using spawn.mpq from the original shareware; which can still be [downloaded](http://ftp.blizzard.com/pub/demos/diablosw.exe) for free.
 - `-DCMAKE_TOOLCHAIN_FILE=../CMake/32bit.cmake` generate 32bit builds on 64bit platforms (remember to use the `linux32` command if on Linux).
 - `-DCROSS_PREFIX=/path/to/prefix` set the path to the `i686-w64-mingw32` directory.
+- `-DHELLFIRE=ON` build Hellfire version
 
 ### Debug builds
 - `-DDEBUG=OFF` disable debug mode of the Diablo engine.