Introduce linux-loongarch64

linux-loongarch64/Dockerfile.in

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+ARG ORG=dockcross
+FROM ${ORG}/base:latest
+
+LABEL maintainer="Gleb Popov arrowd@FreeBSD.org"
+
+# Crosstool-ng version 2025-09-07
+ENV CT_VERSION=crosstool-ng-1.28.0
+
+#include "common.crosstool"
+
+# The cross-compiling emulator
+RUN apt-get update \
+&& apt-get install -y \
+  qemu-user \
+  qemu-user-static \
+&& apt-get clean --yes
+
+# The CROSS_TRIPLE is a configured alias of the "loongarch64-unknown-linux-gnu" target.
+ENV CROSS_TRIPLE=loongarch64-unknown-linux-gnu
+
+ENV CROSS_ROOT=${XCC_PREFIX}/${CROSS_TRIPLE}
+ENV AS=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-as \
+    AR=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-ar \
+    CC=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-gcc \
+    CPP=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-cpp \
+    CXX=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-g++ \
+    LD=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-ld \
+    FC=${CROSS_ROOT}/bin/${CROSS_TRIPLE}-gfortran
+
+ENV QEMU_LD_PREFIX="${CROSS_ROOT}/${CROSS_TRIPLE}/sysroot"
+ENV QEMU_SET_ENV="LD_LIBRARY_PATH=${CROSS_ROOT}/lib:${QEMU_LD_PREFIX}"
+
+COPY Toolchain.cmake /usr/lib/${CROSS_TRIPLE}/
+ENV CMAKE_TOOLCHAIN_FILE=/usr/lib/${CROSS_TRIPLE}/Toolchain.cmake
+
+ENV PKG_CONFIG_PATH=/usr/lib/loongarch64-unknown-linux-gnu/pkgconfig
+
+# Linux kernel cross compilation variables
+ENV PATH=${PATH}:${CROSS_ROOT}/bin
+ENV CROSS_COMPILE=${CROSS_TRIPLE}-
+ENV ARCH=loongarch64
+
+#include "common.label-and-env"

linux-loongarch64/Toolchain.cmake

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+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR loongarch64)
+
+set(cross_triple $ENV{CROSS_TRIPLE})
+set(cross_root $ENV{CROSS_ROOT})
+
+set(CMAKE_C_COMPILER $ENV{CC})
+set(CMAKE_CXX_COMPILER $ENV{CXX})
+set(CMAKE_Fortran_COMPILER $ENV{FC})
+
+set(CMAKE_CXX_FLAGS "-I ${cross_root}/include/")
+
+list(APPEND CMAKE_FIND_ROOT_PATH ${CMAKE_PREFIX_PATH} ${cross_root} ${cross_root}/${cross_triple})
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_SYSROOT ${cross_root}/${cross_triple}/sysroot)
+
+set(CMAKE_CROSSCOMPILING_EMULATOR /usr/bin/qemu-loongarch64)