Add initial barebones kernel and cross compiler container image

cross-compiler-image/Dockerfile

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+
+FROM ubuntu:latest
+
+RUN apt-get update
+
+COPY packages.txt .
+RUN apt-get install -y --no-install-recommends --no-install-suggests $(cat packages.txt)
+
+COPY gnu-keyring.gpg /gnu-keyring.gpg
+RUN gpg --import /gnu-keyring.gpg
+
+#ARG BINUTILS_MIRROR="https://ftp.gnu.org/gnu/binutils/"
+ARG BINUTILS_MIRROR="https://gnuftp.uib.no/binutils/"
+ARG BINUTILS_NAME="binutils-2.42"
+ARG BINUTILS_ARCHIVE=${BINUTILS_NAME}".tar.gz"
+
+#ARG GCC_MIRROR="https://ftp.gnu.org/gnu/gcc/gcc-14.1.0/"
+ARG GCC_MIRROR="https://gnuftp.uib.no/gcc/gcc-14.1.0/"
+ARG GCC_NAME="gcc-14.1.0"
+ARG GCC_ARCHIVE=${GCC_NAME}".tar.gz"
+
+ARG PREFIX=/opt/cross/
+ARG TARGET=i686-elf
+ENV PATH=${PREFIX}bin:${PATH}
+
+WORKDIR build
+
+# download and build gcc and binutils source
+RUN set -x                                                      \
+ && wget --no-verbose ${BINUTILS_MIRROR}${BINUTILS_ARCHIVE}     \
+ && wget --no-verbose ${BINUTILS_MIRROR}${BINUTILS_ARCHIVE}.sig \
+ && gpg  --verify "${BINUTILS_ARCHIVE}.sig"                     \
+ && mkdir binutils                                              \
+ && tar -xf ${BINUTILS_ARCHIVE} -C binutils                     \
+ && mkdir binutils-build                                        \
+ && cd binutils-build                                           \
+ && ../binutils/${BINUTILS_NAME}/configure                      \
+        --target=$TARGET                                        \
+        --prefix=$PREFIX                                        \
+        --with-sysroot                                          \
+        --disable-nls                                           \
+        --disable-werror                                        \
+ && make -j 8                                                   \
+ && make install                                                \
+ && rm -rf binutils-build binutils ${BINUTLS_ARCHIVE}
+
+RUN set -x                                             \
+ && wget --no-verbose ${GCC_MIRROR}${GCC_ARCHIVE}      \
+ && wget --no-verbose ${GCC_MIRROR}${GCC_ARCHIVE}.sig  \
+ && gpg --verify "${GCC_ARCHIVE}.sig"                  \
+ && mkdir gcc                                          \
+ && tar -xf ${GCC_ARCHIVE} -C gcc                      \
+ && mkdir gcc-build                                    \
+ && cd gcc-build                                       \
+ && ../gcc/${GCC_NAME}/configure                       \
+        --target=$TARGET                               \
+        --prefix=$PREFIX                               \
+        --disable-nls                                  \
+        --enable-languages=c                           \
+        --without-headers                              \
+ && make -j 8 all-gcc                                  \
+ && make -j 8 all-target-libgcc                        \
+ && make install-gcc                                   \
+ && make install-target-libgcc                         \
+ && rm -rf gcc-build gcc ${GCC_ARCHIVE}
+
+WORKDIR /runtime

cross-compiler-image/packages.txt

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+build-essential
+bison
+flex
+libgmp3-dev
+libmpc-dev
+libmpfr-dev
+texinfo
+libisl-dev
+wget
+gpg
+gpg-agent
+gzip
+ca-certificates