new file mode 100644

@@ -0,0 +1,281 @@

+# Cross-compiling ClamAV on Linux for arm64

+

+These are instructions to cross-compile ClamAV on Linux amd64 (`x86_64-unknown-linux-gnu`) with GCC for Linux arm64 (`aarch64-unknown-linux-gnu`).

+

+> _Note_: These build instructions were written for Ubuntu. You may need to change a few steps to work with your distro.

+

+## Install build tools, if missing

+

+Install the GCC/G++ and Rust toolchains needed to cross-compile to aarch64:

+

+```bash

+# Install toolchain

+sudo apt install -y g++-aarch64-linux-gnu

+rustup target add aarch64-unknown-linux-gnu

+```

+

+## Install build dependencies

+

+If you have a sysroot for your `aarch64-unknown-linux-gnu` target platform with the required dependencies installed, skip this step. Else, do these things to install arm64 (aarch64) versions of the ClamAV library dependencies on the local host.

+

+```bash

+sudo dpkg --add-architecture arm64

+```

+

+Create a new .list file in `/etc/apt/sources.list.d`:

+

+```bash

+sudo vim  /etc/apt/sources.list.d/arm-cross-compile-sources.list

+```

+

+Add arm64 package sources to this new list:

+```

+deb [arch=arm64] http://ports.ubuntu.com/ focal main restricted

+deb [arch=arm64] http://ports.ubuntu.com/ focal-updates main restricted

+deb [arch=arm64] http://ports.ubuntu.com/ focal universe

+deb [arch=arm64] http://ports.ubuntu.com/ focal-updates universe

+deb [arch=arm64] http://ports.ubuntu.com/ focal multiverse

+deb [arch=arm64] http://ports.ubuntu.com/ focal-updates multiverse

+deb [arch=arm64] http://ports.ubuntu.com/ focal-backports main restricted universe multiverse

+```

+

+> _Tip_: "focal" is for Ubuntu 20.04LTS. You may need to swap to another to match your release:

+> - focal (20.04LTS)

+> - jammy (22.04LTS)

+> - kinetic (22.10)

+> - lunar (23.04)

+> - mantic (23.10)

+>

+> See https://packages.ubuntu.com/ for more.

+

+Now install the arm64 libraries:

+

+```bash

+apt-get update && apt-get install -y \

+  check:arm64 \

+  libbz2-dev:arm64 \

+  libcurl4-openssl-dev:arm64 \

+  libjson-c-dev:arm64 \

+  libmilter-dev:arm64 \

+  libncurses5-dev:arm64 \

+  libpcre2-dev:arm64 \

+  libssl-dev:arm64 \

+  libxml2-dev:arm64 \

+  zlib1g-dev:arm64

+```

+

+After install, the `.a` and `.so` libraries will be found under `/usr/lib/aarch64-linux-gnu/`. The headers are the same as for any other arch, so those will be under `/usr/include/` as per usual.

+

+## Create a CMake toolchain file

+

+A CMake toolchain file specifies some toolchain specific variables.

+

+Note: The `CMAKE_SYSROOT` variable may **not** be set using the `cmake -D CMAKE_SYROOT=PATH` method and must be in this file. Meanwhile, some other variables (namely `CMAKE_INSTALL_PREFIX`) *cannot* be set in the toolchain file, and should be passed as a command parameter.

+

+## Help Cargo find GCC (possibly needed)

+

+On some systems, `cargo` does not find the right GCC executable and emits this error:

+```

+ = note: cc: error: unrecognized command-line option '-m64'

+```

+

+**If** this error occurs during the build, set the following environment variables and then try again:

+```sh

+export HOST_CC=gcc

+export CC_x86_64_unknown_linux_gnu=/usr/bin/x86_64-linux-gnu-gcc

+export CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=/usr/bin/x86_64-linux-gnu-gcc

+```

+

+> _Note_: Your specific path to and executable name for GCC may vary depending on your platform.

+

+> _Credit_: [Kornel on Stack Overflow](https://stackoverflow.com/a/72546887/3430496)

+

+### If using a sysroot

+

+`CMAKE_TOOLCHAIN_ARM64.cmake`:

+```cmake

+# Platform

+set(CMAKE_SYSTEM_NAME       Linux)

+set(CMAKE_SYSTEM_PROCESSOR  arm64)

+set(CMAKE_C_COMPILER        "aarch64-linux-gnu-gcc")

+set(CMAKE_CXX_COMPILER      "aarch64-linux-gnu-g++")

+set(RUST_COMPILER_TARGET    "aarch64-unknown-linux-gnu")

+

+# Project Variables needed to cross compile

+set(HAVE_ATTRIB_ALIGNED     1)

+set(HAVE_ATTRIB_PACKED      1)

+set(HAVE_UNAME_SYSCALL      1)

+set(HAVE_SAR                1)

+set(HAVE_FD_PASSING         1)

+set(MMAP_FOR_CROSSCOMPILING ON)

+set(ENABLE_SYSTEMD          OFF)

+

+set( test_run_result

+     "PLEASE_FILL_OUT-FAILED_TO_RUN"

+     CACHE STRING "Result from try_run" FORCE)

+

+set( test_run_result__TRYRUN_OUTPUT

+     "PLEASE_FILL_OUT-NOTFOUND"

+     CACHE STRING "Output from try_run" FORCE)

+

+#

+# Dependencies

+#

+

+# If using a sysroot / rootfs for the target, set these.

+set(CMAKE_SYSROOT           /opt/aarch64-wrs-linux-sysroot)

+

+# If your CMAKE_SYSROOT directory is readonly, or for some reason you want to install to a different staging prefix before copying  to your host, set this:

+#set(CMAKE_STAGING_PREFIX    /home/user/stage)

+

+# Note, you may need to set ENABLE_JSON_SHARED if your sysroot provides libjson-c.so instead of libjson-c.a.

+#set(ENABLE_JSON_SHARED      ON)

+

+# You may need to set the following if CMake has some trouble finding the depenencies.

+# For example if you have `libjson-c.a` in your sysroot, here: `/opt/aarch64-wrs-linux-sysroot/usr/lib64/libjson-c.a`

+# then you would set:

+#set(JSONC_LIBRARY           "/usr/lib64/libjson-c.a")

+

+#

+# Uncomment these as needed:

+#

+#set(JSONC_INCLUDE_DIR       "/usr/include/json-c")

+#set(JSONC_LIBRARY           "/usr/lib64/libjson-c.a")

+#set(ENABLE_JSON_SHARED      OFF)

+

+#set(BZIP2_INCLUDE_DIR       "/usr/include/")

+#set(BZIP2_LIBRARY           "/usr/lib64/libbz2.a")

+

+#set(OPENSSL_ROOT_DIR        "/usr/")

+#set(OPENSSL_INCLUDE_DIR     "/usr/include/")

+#set(OPENSSL_CRYPTO_LIBRARY  "/usr/lib64/libcrypto.so")

+#set(OPENSSL_SSL_LIBRARY     "/usr/lib64/libssl.so")

+

+#set(LIBXML2_INCLUDE_DIR     "/usr/include/libxml2")

+#set(LIBXML2_LIBRARY         "/usr/lib64/libxml2.so")

+

+#set(PCRE2_INCLUDE_DIR       "/usr/include/")

+#set(PCRE2_LIBRARY           "/usr/lib64/libpcre2-8.so")

+

+#set(CURSES_INCLUDE_DIR      "/usr/include/")

+#set(CURSES_LIBRARY          "/usr/lib/aarch64-linux-gnu/libncurses.a;/usr/lib/aarch64-linux-gnu/libtinfo.a")

+# Tip: You may not need to also link with libtinfo.a, depending on what your distribution provides:

+#set(CURSES_LIBRARY          "/usr/lib/aarch64-linux-gnu/libncurses.a")

+# Tip: Alternatively, you could link with the shared library:

+#set(CURSES_LIBRARY          "/usr/lib/aarch64-linux-gnu/libncurses.so")

+

+#set(ZLIB_INCLUDE_DIR        "/usr/include/")

+#set(ZLIB_LIBRARY            "/usr/lib64/libz.so")

+

+#set(LIBCHECK_INCLUDE_DIR    "/usr/include/")

+#set(LIBCHECK_LIBRARY        "/usr/lib64/libcheck.a")

+```

+

+### If not using a sysroot

+

+Without a sysroot, you must tell CMake exactly where to find the library dependencies built for aarch64.

+

+> _IMPORTANT_: Without a sysroot, your runtime platform must have these EXACT SAME libraries.

+

+`CMAKE_TOOLCHAIN_ARM64.cmake`:

+```cmake

+# Platform

+set(CMAKE_SYSTEM_NAME       Linux)

+set(CMAKE_SYSTEM_PROCESSOR  arm64)

+set(CMAKE_C_COMPILER        "aarch64-linux-gnu-gcc")

+set(CMAKE_CXX_COMPILER      "aarch64-linux-gnu-g++")

+set(RUST_COMPILER_TARGET    "aarch64-unknown-linux-gnu")

+

+# Project Variables needed to cross compile

+set(HAVE_ATTRIB_ALIGNED     1)

+set(HAVE_ATTRIB_PACKED      1)

+set(HAVE_UNAME_SYSCALL      1)

+set(HAVE_SAR                1)

+set(HAVE_FD_PASSING         1)

+set(MMAP_FOR_CROSSCOMPILING ON)

+set(ENABLE_SYSTEMD          OFF)

+

+set( test_run_result

+     "PLEASE_FILL_OUT-FAILED_TO_RUN"

+     CACHE STRING "Result from try_run" FORCE)

+

+set( test_run_result__TRYRUN_OUTPUT

+     "PLEASE_FILL_OUT-NOTFOUND"

+     CACHE STRING "Output from try_run" FORCE)

+

+#

+# Dependencies

+#

+

+set(JSONC_INCLUDE_DIR       "/usr/include/json-c")

+set(JSONC_LIBRARY           "/usr/lib/aarch64-linux-gnu/libjson-c.a")

+set(ENABLE_JSON_SHARED      OFF)

+

+set(BZIP2_INCLUDE_DIR       "/usr/include/")

+set(BZIP2_LIBRARY           "/usr/lib/aarch64-linux-gnu/libbz2.a")

+

+set(OPENSSL_ROOT_DIR        "/usr/")

+set(OPENSSL_INCLUDE_DIR     "/usr/include/")

+set(OPENSSL_CRYPTO_LIBRARY  "/usr/lib/aarch64-linux-gnu/libcrypto.so")

+set(OPENSSL_SSL_LIBRARY     "/usr/lib/aarch64-linux-gnu/libssl.so")

+

+set(LIBXML2_INCLUDE_DIR     "/usr/include/libxml2")

+set(LIBXML2_LIBRARY         "/usr/lib/aarch64-linux-gnu/libxml2.so")

+

+set(PCRE2_INCLUDE_DIR       "/usr/include/")

+set(PCRE2_LIBRARY           "/usr/lib/aarch64-linux-gnu/libpcre2-8.so")

+

+set(CURSES_INCLUDE_DIR      "/usr/include/")

+set(CURSES_LIBRARY          "/usr/lib/aarch64-linux-gnu/libncurses.a;/usr/lib/aarch64-linux-gnu/libtinfo.a")

+# Tip: You may not need to also link with libtinfo.a, depending on what your distribution provides:

+#set(CURSES_LIBRARY          "/usr/lib/aarch64-linux-gnu/libncurses.a")

+# Tip: Alternatively, you could link with the shared library:

+#set(CURSES_LIBRARY          "/usr/lib/aarch64-linux-gnu/libncurses.so")

+

+set(ZLIB_INCLUDE_DIR        "/usr/include/")

+set(ZLIB_LIBRARY            "/usr/lib/aarch64-linux-gnu/libz.so")

+

+set(LIBCHECK_INCLUDE_DIR    "/usr/include/")

+set(LIBCHECK_LIBRARY        "/usr/lib/aarch64-linux-gnu/libcheck.a")

+```

+

+## Build ClamAV

+

+You may need to adjust the paths in the command below to suit your needs.

+

+You'll definitely need to set `CMAKE_STAGING_PREFIX` to your own path, or maybe remove it (see the note, below).

+

+You may wish to set `CMAKE_INSTALL_PREFIX` to some directory other than `/usr`

+

+> _Note_: If using a sysroot and `CMAKE_SYSROOT` is set in your `CMAKE_TOOLCHAIN_ARM64.cmake` file, then the `make install` command will install to that sysroot directory. If you want, you can override it with `CMAKE_STAGING_PREFIX`. After the `make install`, it will be on you to copy the stuff from your staging directory to target system. The instructions below do this, because you may not wish to contaminate your sysroot with output from this build, or because your sysroot may be read-only.

+

+```bash

+mkdir build-arm64 && cd build-arm64

+

+cmake .. \

+    -D CMAKE_TOOLCHAIN_FILE=(pwd)/../CMAKE_TOOLCHAIN_ARM64.cmake \

+    -D ENABLE_STATIC_LIB=OFF \

+    -D ENABLE_SHARED_LIB=ON \

+    -D MAINTAINER_MODE=OFF \

+    -D ENABLE_EXAMPLES=OFF \

+    -D BYTECODE_RUNTIME=interpreter \

+    -D CMAKE_BUILD_TYPE=Release \

+    -D CMAKE_INSTALL_PREFIX="/usr" \

+    -D CMAKE_STAGING_PREFIX=/home/user/stage/usr

+

+make

+make install

+```

+

+## Verify it built for right platform

+

+We cannot run the ClamAV unit test suite, because we're cross compiling and can't run the programs we build. But we can do a very small test with the Unix `file` command to see that it built for the right platform. For example:

+

+```bash

+file install/bin/clamscan

+```

+

+Example output:

+`install/bin/clamscan: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=289a6b738e7421c5bb09c7ee5fc5bb20bfe98025, for GNU/Linux 3.7.0, with debug_info, not stripped`

+

+If everything looks good, you can probably copy the install files to your system and run it.

new file mode 100644

@@ -0,0 +1,124 @@

+# Cross-compiling ClamAV on Windows for ARM64

+

+These are instructions to cross-compile ClamAV on Windows x64 (`x86_64-pc-windows-msvc`) with GCC for Linux arm64 (`aarch64-pc-windows-msvc`).

+

+## Install build tools, if missing

+

+Use the Visual Studio Installer tools to add the ARM64 components. E.g. this stuff:

+- MSVC v143 - VS 2022 C++ ARM build tools (Latest)

+- MSVC v143 - VS 2022 C++ ARM Spectre-mitigated libs (Latest)

+- MSVC v143 - VS 2022 C++ ARM64/ARM64EC build tools (Latest)

+- MSVC v143 - VS 2022 C++ ARM64/ARM64EC Spectre-mitigated libs (Latest)

+- C++ ATL for latest v143 build tools (ARM)

+- C++ ATL for latest v143 build tools (ARM64/ARM64EC)

+- C++ ATL for latest v143 build tools with Spectre-Mitigations (ARM)

+- C++ ATL for latest v143 build tools with Spectre-Mitigations (ARM64/ARM64EC)

+- C++ MFC for latest v143 build tools (ARM)

+- C++ MFC for latest v143 build tools (ARM64/ARM64EC)

+- C++ MFC for latest v143 build tools with Spectre-Mitigations (ARM)

+- C++ MFC for latest v143 build tools with Spectre-Mitigations (ARM64/ARM64EC)

+

+Install the Rust toolchains needed to cross-compile to arm64:

+

+```powershell

+rustup target add aarch64-pc-windows-msvc

+```

+

+## Use Mussels to build ARM64 C-based library dependencies

+

+See the [online documentation regarding building dependencies with Mussels](https://docs.clamav.net/manual/Development/build-installer-packages.html#windows). To build for ARM64, change the commands to build like this:

+

+```powershell

+msl build -t arm64 clamav_deps

+```

+

+Once the build is complete, you'll find the ARM64 compiled libraries under `~\.mussels\install\arm64\`.

+

+## Create a CMake toolchain file

+

+A CMake toolchain file specifies some toolchain specific variables.

+

+`CMAKE_TOOLCHAIN_ARM64.cmake`:

+```cmake

+# Platform

+set(CMAKE_SYSTEM_NAME       Windows)

+set(CMAKE_SYSTEM_PROCESSOR  arm64)

+set(RUST_COMPILER_TARGET    "aarch64-pc-windows-msvc")

+

+# Project Variables needed to cross compile

+set(HAVE_PRAGMA_PACK        1)

+set(HAVE_SAR                1)

+set(MMAP_FOR_CROSSCOMPILING OFF)

+set(ENABLE_SYSTEMD          OFF)

+

+set( test_run_result

+     "PLEASE_FILL_OUT-FAILED_TO_RUN"

+     CACHE STRING "Result from try_run" FORCE)

+

+set( test_run_result__TRYRUN_OUTPUT

+     "PLEASE_FILL_OUT-NOTFOUND"

+     CACHE STRING "Output from try_run" FORCE)

+```

+

+## Build ClamAV

+

+You may need to adjust the paths in the command below to suit your needs.

+

+```powershell

+mkdir build-arm64

+cd build-arm64

+

+cmake .. -G "Visual Studio 17 2022" -A arm64 `

+    -D JSONC_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include\\json-c" `

+    -D JSONC_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\json-c.lib" `

+    -D BZIP2_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D BZIP2_LIBRARY_RELEASE="$HOME\\.mussels\\install\\arm64\\lib\\libbz2.lib" `

+    -D CURL_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D CURL_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\libcurl_imp.lib" `

+    -D OPENSSL_ROOT_DIR="$HOME\\.mussels\\install\\arm64\\" `

+    -D OPENSSL_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D LIB_EAY_DEBUG="$HOME\\.mussels\\install\\arm64\\lib\\libcrypto.lib" `

+    -D SSL_EAY_DEBUG="$HOME\\.mussels\\install\\arm64\\lib\\libssl.lib" `

+    -D ZLIB_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\libssl.lib" `

+    -D LIBXML2_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include\\libxml" `

+    -D LIBXML2_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\libxml2.lib" `

+    -D PCRE2_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D PCRE2_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\pcre2-8.lib" `

+    -D PDCURSES_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D CURSES_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\pdcurses.lib" `

+    -D PThreadW32_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D PThreadW32_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\pthreadVC3.lib" `

+    -D ZLIB_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D ZLIB_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\zlibstatic.lib" `

+    -D LIBCHECK_INCLUDE_DIR="$HOME\\.mussels\\install\\arm64\\include" `

+    -D LIBCHECK_LIBRARY="$HOME\\.mussels\\install\\arm64\\lib\\checkDynamic.lib" `

+    -D CMAKE_TOOLCHAIN_FILE=$pwd\\..\\CMAKE_TOOLCHAIN_ARM64.cmake `

+    -D ENABLE_STATIC_LIB=OFF `

+    -D ENABLE_SHARED_LIB=ON `

+    -D MAINTAINER_MODE=OFF `

+    -D ENABLE_EXAMPLES=OFF `

+    -D BYTECODE_RUNTIME=interpreter `

+    -D HAVE_PRAGMA_PACK=1 `

+    -D HAVE_SAR=1 `

+    -D CMAKE_INSTALL_PREFIX="install"

+

+cmake --build . --config Release --target install

+```

+

+## Verify it built for right platform

+

+We cannot run the ClamAV unit test suite, because we're cross compiling and can't run the programs we build. But we can do a very small test to see that it built for the right platform.

+

+Pop into WSL2 (Windows Subsystem for Linux 2) to make use of the `file` utility:

+

+```powershell

+❯ wsl

+Welcome to fish, the friendly interactive shell

+Type `help` for instructions on how to use fish

+

+clamav-micah-2/build-arm64 on  main [$] via C v9.4.0-gcc via △ v3.27.2

+❯ file install/clamscan.exe

+install/clamscan.exe: PE32+ executable (console) Aarch64, for MS Windows

+```

+

+If everything looks good, you can probably copy the install files to your system and run it.

@@ -782,6 +782,10 @@ Run `rustup target add --help` for help.

 For a list of available target triples, see:

 https://doc.rust-lang.org/nightly/rustc/platform-support.html

+Step-by-step instructions for cross-compiling ClamAV:

+- [Linux GCC amd64 to arm64](./INSTALL-cross-linux-arm64.md)

+- [Windows MSVC x64 to arm64](./INSTALL-cross-windows-arm64.md)

+

 ## Un-install

 CMake doesn't provide a simple command to uninstall. However, CMake does build