Hmm, can't build crosstool-ng yet.

Dockerfile

@@ -10,7 +10,7 @@ ENV CFLAGS="-static -O2" \
     CXXFLAGS="-static -O2" \
     LDFLAGS="-static"
 
-# Base build tools + musl-dev, etc.
+# Install build dependencies
 RUN apk add --no-cache \
         build-base \
         cmake \
@@ -24,10 +24,78 @@ RUN apk add --no-cache \
         linux-headers \
         bash \
         ccache \
-        mold
+        mold \
+        musl-dev \
+        gcc \
+        g++ \
+        make \
+        python3 \
+        bison \
+        flex \
+        texinfo \
+        gperf \
+        help2man \
+        gettext-dev \
+        autoconf \
+        automake \
+        libtool \
+        patch \
+        gawk \
+        xz-dev
 
-# Configure mold as the default linker
-ENV LD=mold
+# Build ncurses from source
+RUN cd /tmp && \
+    wget https://invisible-mirror.net/archives/ncurses/ncurses-6.4.tar.gz && \
+    tar xf ncurses-6.4.tar.gz && \
+    cd ncurses-6.4 && \
+    ./configure --prefix=/usr \
+                --without-shared \
+                --with-normal \
+                --enable-pc-files \
+                --with-pkg-config-libdir=/usr/lib/pkgconfig \
+                --enable-widec \
+                --disable-database \
+                --with-fallbacks=linux \
+                --with-panel \
+                --with-panel-libs && \
+    make -j$(nproc) && \
+    make install && \
+    cd .. && \
+    rm -rf ncurses-6.4*
+
+# Build crosstool-ng
+RUN cd /tmp && \
+    wget https://github.com/crosstool-ng/crosstool-ng/releases/download/crosstool-ng-1.25.0/crosstool-ng-1.25.0.tar.xz && \
+    tar xf crosstool-ng-1.25.0.tar.xz && \
+    cd crosstool-ng-1.25.0 && \
+    export CPPFLAGS="-I/usr/include/ncursesw" && \
+    ./configure --prefix=/usr && \
+    make -j$(nproc) && \
+    make install && \
+    cd .. && \
+    rm -rf crosstool-ng-1.25.0*
+
+# Create crosstool-ng config
+RUN mkdir -p /tmp/ct-ng && \
+    cd /tmp/ct-ng && \
+    ct-ng aarch64-unknown-linux-musl && \
+    sed -i 's/CT_MUSL_VERSION="1.2.4"/CT_MUSL_VERSION="1.2.4"/' .config && \
+    sed -i 's/CT_GCC_VERSION="13.1.0"/CT_GCC_VERSION="13.1.0"/' .config && \
+    sed -i 's/CT_BINUTILS_VERSION="2.41"/CT_BINUTILS_VERSION="2.41"/' .config && \
+    sed -i 's/CT_LINUX_VERSION="6.1.28"/CT_LINUX_VERSION="6.1.28"/' .config && \
+    sed -i 's/CT_PARALLEL_JOBS=0/CT_PARALLEL_JOBS=$(nproc)/' .config
+
+# Build the toolchain
+RUN cd /tmp/ct-ng && \
+    ct-ng build
+
+# Install the toolchain
+RUN mkdir -p /opt/cross && \
+    cp -r /tmp/ct-ng/.build/aarch64-unknown-linux-musl/* /opt/cross/ && \
+    rm -rf /tmp/ct-ng
+
+# Add toolchain to PATH
+ENV PATH="/opt/cross/bin:${PATH}"
 
 ########################################
 # nlohmann/json (compiled static .a)   #
@@ -94,13 +162,19 @@ RUN apk add --no-cache \
         curl \
         linux-headers \
         ccache \
-        mold
+        mold \
+        ncurses-dev \
+        ncurses-terminfo-base
 
 # Configure mold as the default linker
 ENV LD=mold
 
-# Copy pre‑built static libs + headers
+# Copy pre‑built static libs + headers and cross-compiler toolchain
 COPY --from=builder /usr/local /usr/local
+COPY --from=builder /opt/cross /opt/cross
+
+# Add toolchain to PATH
+ENV PATH="/opt/cross/bin:${PATH}"
 
 ENV CFLAGS="-static -O2" \
     CXXFLAGS="-static -O2" \

test/cmake/aarch64-linux-gnu.cmake

@@ -0,0 +1,21 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
+
+# Specify the cross compilers
+set(CMAKE_C_COMPILER /opt/cross/bin/aarch64-unknown-linux-musl-gcc)
+set(CMAKE_CXX_COMPILER /opt/cross/bin/aarch64-unknown-linux-musl-g++)
+
+# Where is the target environment
+set(CMAKE_FIND_ROOT_PATH /opt/cross/aarch64-unknown-linux-musl)
+
+# Search for programs in the build host directories
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# Search for libraries and headers in the target directories
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+# Set compiler flags
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8-a")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8-a") 

test/crossbuild.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+TARGET_ARCH="aarch64"
+OUTDIR="output-${TARGET_ARCH}"
+
+# Create volume if it doesn't exist
+docker volume create cppbuild-cache-${TARGET_ARCH}
+
+# Build command to run in the container
+BUILD_COMMAND="mkdir -p /app/build && \
+        cd /app/build && \
+        cmake -G Ninja \
+        -DCMAKE_TOOLCHAIN_FILE=/app/src/cmake/${TARGET_ARCH}-linux-gnu.cmake \
+        /app/src && \
+        ninja -j$(nproc) && \
+        mkdir -p /app/src/$OUTDIR && \
+        cp /app/build/ipdemo /app/src/$OUTDIR/ipdemo && \
+        chown -R $(id -u):$(id -g) /app/src/$OUTDIR"
+
+# Run the build in the container
+docker run --rm \
+    -v cppbuild-cache-${TARGET_ARCH}:/app/build \
+    -v $(pwd):/app/src \
+    -w /app/src \
+    -e CCACHE_DIR=/app/build/.ccache \
+    -e CC="ccache /opt/cross/bin/aarch64-unknown-linux-musl-gcc" \
+    -e CXX="ccache /opt/cross/bin/aarch64-unknown-linux-musl-g++" \
+    -e LD=mold \
+    -e CMAKE_BUILD_PARALLEL_LEVEL=$(nproc) \
+    -e NINJA_STATUS="[%f/%t] " \
+    cpp-httplib-builder:latest \
+    -c "$BUILD_COMMAND"
+
+echo "Build completed. Output is in $OUTDIR directory"