feat: Support for linux-armv5-uclibc

- used in most linux home routers

linux-armv5-uclibc/Dockerfile.in

@@ -0,0 +1,42 @@
+FROM dockcross/base:latest
+
+LABEL maintainer="Matt McCormick matt.mccormick@kitware.com"
+# Crosstool-ng version
+# We use a git commit while waiting for 1.25 to release (1.24 is several years old)
+# crosstool-ng master 2021-09-17
+ENV CT_VERSION 392955a293573451baf3a9294139d0558b08ca2e
+
+# This is for compiling binaries for arm routers with uclibc (e.g ddwrt, asuswrt)
+#include "common.crosstool"
+
+# The cross-compiling emulator
+RUN apt-get update \
+&& apt-get install -y \
+  qemu-user \
+  qemu-user-static \
+&& apt-get clean --yes
+
+ENV CROSS_TRIPLE arm-unknown-linux-uclibcgnueabi
+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/${CROSS_ROOT}/
+ENV CMAKE_TOOLCHAIN_FILE /usr/lib/${CROSS_ROOT}/Toolchain.cmake
+
+ENV PKG_CONFIG_PATH /usr/lib/{CROSS_ROOT}/pkgconfig/
+
+# Linux kernel cross compilation variables
+ENV PATH ${PATH}:${CROSS_ROOT}/bin
+ENV CROSS_COMPILE ${CROSS_TRIPLE}-
+ENV ARCH arm
+
+#include "common.label-and-env"