build: Make ImHex buildable for MacOS arm64 (#1414)

dist/macOS/arm64.crosscompile.Dockerfile

@@ -0,0 +1,96 @@
+# This image is is provided for reference, but a (potentially more up to date) image should be available at https://github.com/iTrooz/macos-crosscompile
+FROM ubuntu:22.04
+
+ENV PATH                $PATH:/osxcross/target/bin
+ENV LD_LIBRARY_PATH     /osxcross/target/lib
+ENV OSXCROSS_SDK        /osxcross/target/SDK/MacOSX14.0.sdk
+ENV OSXCROSS_TARGET     darwin23
+ENV OSXCROSS_TARGET_DIR /osxcross/target
+ENV OSXCROSS_HOST       aarch64-apple-darwin23
+
+# -- DOWNLOADING STUFF
+
+# Install common stuff
+RUN --mount=type=cache,target=/var/lib/apt/lists/ export DEBIAN_FRONTEND=noninteractive &&\
+    export TZ=Etc/UTC &&\
+    dpkg --add-architecture i386 &&\
+    apt update &&\
+    apt -y install lsb-release build-essential python3 python3-pip git wget zip unzip pkg-config curl ninja-build software-properties-common gnupg libssl-dev ccache
+
+# Install clang 17
+RUN --mount=type=cache,target=/var/lib/apt/lists/ wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && ./llvm.sh 17 &&\
+    ln -s /usr/bin/clang-17 /usr/bin/clang &&\
+    ln -s /usr/bin/clang++-17 /usr/bin/clang++
+
+# Install vcpkg
+RUN cd / &&\
+    git clone --depth 1 https://github.com/Microsoft/vcpkg.git vcpkg &&\
+    cd /vcpkg &&\
+    ./bootstrap-vcpkg.sh -disableMetrics &&\
+    ln -s /vcpkg/vcpkg /usr/bin/ &&\
+    vcpkg install vcpkg-cmake &&\
+    ln -s /vcpkg/downloads/tools/cmake-*/cmake-*/bin/cmake /usr/bin/
+
+RUN --mount=type=cache,target=/cache <<EOF
+## Clone osxcross
+set -xe
+git clone https://github.com/tpoechtrager/osxcross /cache/osxcross || true
+cd /cache/osxcross
+git pull
+cp -r /cache/osxcross /osxcross
+EOF
+
+RUN --mount=type=cache,target=/cache <<EOF
+## Download SDK
+set -xe
+wget https://github.com/joseluisq/macosx-sdks/releases/download/14.0/MacOSX14.0.sdk.tar.xz -O /cache/MacOSX14.0.sdk.tar.xz -nc || true
+cp /cache/MacOSX14.0.sdk.tar.xz /osxcross/tarballs
+EOF
+
+# Init stuff
+## setup ccache dir
+ENV CCACHE_DIR /cache/ccache
+
+# Install triplet file
+COPY arm-osx-mytriplet.cmake /vcpkg/triplets/community
+
+# -- BUILDING STUFF
+ARG JOBS 1
+
+# Install osxcross
+## Build cross-compiler clang-17
+RUN --mount=type=cache,target=/cache <<EOF
+    set -xe
+    ccache -zs
+    
+    cd /osxcross
+    UNATTENDED=1 CC=/usr/lib/ccache/clang-17 CXX=/usr/lib/ccache/clang++-17 ./build.sh
+    
+    ccache -s
+EOF
+# Not needed, because we don't use gcc for cross-compiling anymore
+# ## Install dependencies for gcc-13
+# RUN apt install -y gcc g++ zlib1g-dev libmpc-dev libmpfr-dev libgmp-dev
+# ## Build cross-compiler gcc-13
+# RUN --mount=type=cache,target=/cache <<EOF
+#     set -xe
+#     ccache -zs
+
+#     cd /osxcross
+#     UNATTENDED=1 CC=/usr/lib/ccache/gcc CXX=/usr/lib/ccache/g++ GCC_VERSION=13.2.0 ./build_gcc.sh
+
+#     ccache -s
+# EOF
+
+ARG DELETE_SDK=1
+RUN <<EOF
+# Conditionally delete the SDK from the image
+set -xe
+ 
+if [ "$DELETE_SDK" ]; then
+    rm -r /osxcross/target/SDK
+    echo "Deleted the SDK from the image"
+else
+    echo "NOT deleting the SDK from the image"
+fi
+EOF