add aarch64 option back

Author: chrehall68

README.md

@@ -41,7 +41,7 @@ Each of the following options may be specified when executing CMake by prefixing
 ```bash
 apt install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
 cd libkipr
-cmake -Bbuild -DCMAKE_TOOLCHAIN_FILE=$(pwd)/toolchain/aarch64-linux-gnu.cmake .
+cmake -Bbuild -DCMAKE_TOOLCHAIN_FILE=$(pwd)/toolchain/arm-linux-gnueabihf.cmake .
 ```
 
 # Cross-compiling to JavaScript/WASM (e.g., Simulator)

toolchain/aarch64-linux-gnu.cmake

@@ -0,0 +1,31 @@
+# set(CMAKE_SYSROOT ${AARCH64_LINUX_GNU_SYSROOT})
+set(ARCH aarch64)
+
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
+
+set(triple aarch64-linux-gnu)
+
+set_property(GLOBAL PROPERTY host aarch64-linux)
+set_property(GLOBAL PROPERTY triple ${triple})
+set_property(GLOBAL PROPERTY arch aarch64)
+set_property(GLOBAL PROPERTY target_os linux)
+set_property(GLOBAL PROPERTY cross_prefix ${triple}-)
+
+set(CMAKE_C_COMPILER_TARGET ${triple})
+
+set(CMAKE_C_COMPILER ${triple}-gcc)
+set(CMAKE_C_COMPILER_TARGET ${triple})
+set(CMAKE_CXX_COMPILER ${triple}-g++)
+set(CMAKE_CXX_COMPILER_TARGET ${triple})
+set(CMAKE_ASM_COMPILER ${triple}-as)
+set(CMAKE_ASM_COMPILER_TARGET ${triple})
+set(CMAKE_LINKER ${triple}-ld)
+set(CMAKE_ADDR2LINE ${triple}-addr2line)
+set(CMAKE_AR ${triple}-ar)
+set(CMAKE_NM ${triple}-nm)
+set(CMAKE_OBJCOPY ${triple}-objcopy)
+set(CMAKE_OBJDUMP ${triple}-objdump)
+set(CMAKE_RANLIB ${triple}-ranlib)
+set(CMAKE_READELF ${triple}-readelf)
+set(CMAKE_STRIP ${triple}-strip)