Attempt to cross-compile for arm64 Linux

CMakeLists.txt

@@ -492,6 +492,9 @@ if(ENABLE_CONAN)
     set(TBB_SHARED True)
   endif()
 
+  if(NOT CONAN_CMAKE_SYSTEM_PROCESSOR)
+    set(CONAN_CMAKE_SYSTEM_PROCESSOR ${CMAKE_SYSTEM_PROCESSOR})
+  endif()
   set(CONAN_ARGS       
     REQUIRES 
     "boost/${CONAN_BOOST_VERSION}"
@@ -503,6 +506,7 @@ if(ENABLE_CONAN)
     GENERATORS cmake_find_package json  # json generator generates a conanbuildinfo.json in the build folder so (non-CMake) projects can easily parse OSRM's dependencies
     KEEP_RPATHS
     NO_OUTPUT_DIRS
+    ENV CONAN_CMAKE_SYSTEM_PROCESSOR=aarch64
     OPTIONS boost:filesystem_version=3 # https://stackoverflow.com/questions/73392648/error-with-boost-filesystem-version-in-cmake
             onetbb:shared=${TBB_SHARED}
             boost:without_stacktrace=True # Apple Silicon cross-compilation fails without it
@@ -511,8 +515,8 @@ if(ENABLE_CONAN)
   # explicitly say Conan to use x86 dependencies if build for x86 platforms (https://github.com/conan-io/cmake-conan/issues/141)
   if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
     conan_cmake_run("${CONAN_ARGS};ARCH;x86")
-  # cross-compilation for Apple Silicon
-  elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64" AND CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64")
+  # cross-compilation for arm64 processors
+  elseif((CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64") AND CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64")
     conan_cmake_run("${CONAN_ARGS};ARCH;armv8")
   else()
     conan_cmake_run("${CONAN_ARGS}")

toolchain.cmake

@@ -0,0 +1,78 @@
+# Conan automatically generated toolchain file
+# DO NOT EDIT MANUALLY, it will be overwritten
+
+# Avoid including toolchain file several times (bad if appending to variables like
+#   CMAKE_CXX_FLAGS. See https://github.com/android/ndk/issues/323
+include_guard()
+
+message(STATUS "Using Conan toolchain: ${CMAKE_CURRENT_LIST_FILE}")
+
+if(${CMAKE_VERSION} VERSION_LESS "3.15")
+    message(FATAL_ERROR "The 'CMakeToolchain' generator only works with CMake >= 3.15")
+endif()
+
+
+
+
+
+
+
+
+
+
+# Extra c, cxx, linkflags and defines
+
+
+if(DEFINED CONAN_CXX_FLAGS)
+  string(APPEND CMAKE_CXX_FLAGS_INIT " ${CONAN_CXX_FLAGS}")
+endif()
+if(DEFINED CONAN_C_FLAGS)
+  string(APPEND CMAKE_C_FLAGS_INIT " ${CONAN_C_FLAGS}")
+endif()
+if(DEFINED CONAN_SHARED_LINKER_FLAGS)
+  string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " ${CONAN_SHARED_LINKER_FLAGS}")
+endif()
+if(DEFINED CONAN_EXE_LINKER_FLAGS)
+  string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " ${CONAN_EXE_LINKER_FLAGS}")
+endif()
+
+get_property( _CMAKE_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE )
+if(_CMAKE_IN_TRY_COMPILE)
+    message(STATUS "Running toolchain IN_TRY_COMPILE")
+    return()
+endif()
+
+set(CMAKE_FIND_PACKAGE_PREFER_CONFIG ON)
+
+# Definition of CMAKE_MODULE_PATH
+# the generators folder (where conan generates files, like this toolchain)
+list(PREPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
+
+# Definition of CMAKE_PREFIX_PATH, CMAKE_XXXXX_PATH
+# The Conan local "generators" folder, where this toolchain is saved.
+list(PREPEND CMAKE_PREFIX_PATH ${CMAKE_CURRENT_LIST_DIR} )
+
+
+
+
+
+message(STATUS "Conan toolchain: Setting BUILD_SHARED_LIBS = ON")
+set(BUILD_SHARED_LIBS ON)
+
+set(CMAKE_INSTALL_PREFIX "/home/runner/.conan/data/onetbb/2021.3.0/_/_/package/a36e366b2b0ea0e76bafba6092e0a74838fad5fd")
+set(CMAKE_INSTALL_BINDIR "bin")
+set(CMAKE_INSTALL_SBINDIR "bin")
+set(CMAKE_INSTALL_LIBEXECDIR "bin")
+set(CMAKE_INSTALL_LIBDIR "lib")
+set(CMAKE_INSTALL_INCLUDEDIR "include")
+set(CMAKE_INSTALL_OLDINCLUDEDIR "include")
+set(CMAKE_SYSTEM_PROCESSOR "aarch64")
+
+# Variables
+set(TBB_TEST OFF CACHE BOOL "Variable TBB_TEST conan-toolchain defined")
+set(TBB_STRICT OFF CACHE BOOL "Variable TBB_STRICT conan-toolchain defined")
+# Variables  per configuration
+
+
+# Preprocessor definitions
+# Preprocessor definitions per configuration