Implement "ct-ng" building, add "linux-mips".

Add a mechanism to construct a full cross-compiler environment using the
"crosstool-ng" cross-compiler building utility. This is implemented in
the new "common.crosstool" include, and augments the "dockcross/base"
base image.

Update Makefile to consolidate Dockerfile generation, notably the
"sed"-based inclusion directives.

Finally, employ all of this to generate a "linux-mips" 32-bit hard-float
MIPS cross-compiler Dockcross image.

Makefile

@@ -13,11 +13,17 @@ ORG = dockcross
 BIN = ./bin
 
 # These images are built using the "build implicit rule"
-STANDARD_IMAGES = android-arm linux-x86 linux-x64 linux-arm64 linux-armv5 linux-armv6 linux-armv7 linux-mipsel linux-ppc64le windows-x86 windows-x64
+STANDARD_IMAGES = android-arm linux-x86 linux-x64 linux-arm64 linux-armv5 linux-armv6 linux-armv7 linux-mips linux-mipsel linux-ppc64le windows-x86 windows-x64
+
+# Generated Dockerfiles.
+GEN_IMAGES = linux-mips manylinux-x86 manylinux-x64 browser-asmjs
+GEN_IMAGE_DOCKERFILES = $(addsuffix /Dockerfile,$(GEN_IMAGES))
 
 # These images are expected to have explicit rules for *both* build and testing
 NON_STANDARD_IMAGES = browser-asmjs manylinux-x64 manylinux-x86
 
+DOCKER_COMPOSITE_SOURCES = common.docker common.debian common.manylinux common.crosstool
+
 # This list all available images
 IMAGES = $(STANDARD_IMAGES) $(NON_STANDARD_IMAGES)
 
@@ -43,11 +49,22 @@ images: base $(IMAGES)
 #
 test: base.test $(addsuffix .test,$(IMAGES))
 
+#
+# Generic Targets (can specialize later).
+#
+
+$(GEN_IMAGE_DOCKERFILES) Dockerfile: %Dockerfile: %Dockerfile.in $(DOCKER_COMPOSITE_SOURCES)
+	sed \
+		-e '/common.docker/ r common.docker' \
+		-e '/common.debian/ r common.debian' \
+		-e '/common.manylinux/ r common.manylinux' \
+		-e '/common.crosstool/ r common.crosstool' \
+		$< > $@
+
 #
 # browser-asmjs
 #
-browser-asmjs: browser-asmjs/Dockerfile.in common.docker common.debian
+browser-asmjs: browser-asmjs/Dockerfile
-	sed -e '/common.docker/ r common.docker' -e '/common.debian/ r common.debian' $@/Dockerfile.in > $@/Dockerfile
 	mkdir -p $@/imagefiles && cp -r imagefiles $@/
 	cp -r test browser-asmjs/
 	$(DOCKER) build -t $(ORG)/browser-asmjs:latest \
@@ -67,9 +84,6 @@ browser-asmjs.test: browser-asmjs
 
 #
 # manylinux-x64
-#
-manylinux-x64/Dockerfile: manylinux-x64/Dockerfile.in common.docker common.manylinux
-	sed -e '/common.docker/ r common.docker' -e '/common.manylinux/ r common.manylinux' manylinux-x64/Dockerfile.in > manylinux-x64/Dockerfile
 
 manylinux-x64: manylinux-x64/Dockerfile
 	mkdir -p $@/imagefiles && cp -r imagefiles $@/
@@ -88,8 +102,6 @@ manylinux-x64.test: manylinux-x64
 #
 # manylinux-x86
 #
-manylinux-x86/Dockerfile: manylinux-x86/Dockerfile.in common.docker common.manylinux
-	sed -e '/common.docker/ r common.docker' -e '/common.manylinux/ r common.manylinux' manylinux-x86/Dockerfile.in > manylinux-x86/Dockerfile
 
 manylinux-x86: manylinux-x86/Dockerfile
 	mkdir -p $@/imagefiles && cp -r imagefiles $@/
@@ -108,8 +120,6 @@ manylinux-x86.test: manylinux-x86
 #
 # base
 #
-Dockerfile: Dockerfile.in common.docker common.debian
-	sed -e '/common.docker/ r common.docker' -e '/common.debian/ r common.debian' Dockerfile.in > Dockerfile
 
 base: Dockerfile imagefiles/
 	$(DOCKER) build -t $(ORG)/base:latest \
@@ -131,7 +141,8 @@ $(VERBOSE).SILENT: display_images
 #
 # build implicit rule
 #
-$(STANDARD_IMAGES): base
+
+$(STANDARD_IMAGES): %: %/Dockerfile base
 	mkdir -p $@/imagefiles && cp -r imagefiles $@/
 	$(DOCKER) build -t $(ORG)/$@:latest \
 		--build-arg IMAGE=$(ORG)/$@ \

common.crosstool

@@ -0,0 +1,46 @@
+# crosstool.common
+#
+# Common Docker instructions to install "crosstool-ng" and build a full
+# cross-compiler suite from a crosstool-ng configuration, CROSSTOOL_CONFIG.
+#
+# This import complements the "dockcross/base" image, adding:
+# - "ct-ng", a cross-compiler building utilty.
+# - A cross-compiler suite configured in "crosstool-ng.config".
+#
+# The generated cross-compiler will have a CROSS_ROOT of:
+#   ${XCC_PREFIX}/${CROSS_TRIPLE}
+#
+# A given platform will need to supply the appropriate "crosstool-ng.config" to
+# generate its cross-compiler. This can be built using "ct-ng menuconfig" to
+# generate a configuration.
+
+# Install Debian packages required for `ct-ng`.
+RUN apt-get update --yes && apt-get install --no-install-recommends --yes \
+  gawk \
+  gperf \
+  help2man \
+  texinfo \
+&& apt-get clean --yes
+
+ENV XCC_PREFIX=/usr/xcc
+
+# Add the crosstool-ng script and image-specific toolchain configuration into
+# /dockcross/.
+#
+# Afterwards, we will leave the "ct-ng" config in the image as a reference
+# for users.
+COPY \
+  imagefiles/install-crosstool-ng-toolchain.sh \
+  crosstool-ng.config \
+  /dockcross/
+
+# Build and install the toolchain, cleaning up artifacts afterwards.
+RUN mkdir /dockcross/crosstool \
+&& cd /dockcross/crosstool \
+&& /dockcross/install-crosstool-ng-toolchain.sh \
+  -p "${XCC_PREFIX}" \
+  -c /dockcross/crosstool-ng.config \
+&& rm -rf /dockcross/crosstool /dockcross/install-crosstool-ng-toolchain.sh
+
+# Restore our default workdir (from "dockcross/base").
+WORKDIR /work

imagefiles/install-crosstool-ng-toolchain.sh

@@ -0,0 +1,94 @@
+#!/bin/bash
+
+# This script operates in a current working directory. It downloads
+# "crosstool-ng", installs the base package, and then configures and installs
+# a toolchain based on the supplied prefix and configuration.
+#
+# Artifacts:
+# - "crosstool-ng" data in the current working directory (can be deleted).
+# - Configured Toolchain installed in the supplied <prefix>.
+
+set -x
+set -e
+set -o pipefail
+
+# Our base directory is the current working directory. All local artifacts will
+# be generated underneath of here.
+ROOT=${PWD}
+
+usage() { echo "Usage: $0 -p <prefix> -c <config-path>" 1>&2; exit 1; }
+
+# Resolve our input parameters.
+#
+# Note: we use "readlink" to resolve them to absolute paths so we can freelhy
+# change directories during installation.
+CT_PREFIX=
+CONFIG_PATH=
+while getopts "p:c:" o; do
+  case "${o}" in
+  p)
+    CT_PREFIX=$(readlink -f ${OPTARG})
+    ;;
+  c)
+    CONFIG_PATH=$(readlink -f ${OPTARG})
+    ;;
+  *)
+    usage
+    ;;
+  esac
+done
+shift $((OPTIND-1))
+
+if [ -z ${CT_PREFIX} ]; then
+  echo "ERROR: You must supply an installation prefix (-p)."
+  usage
+fi
+if [ -z ${CONFIG_PATH} ] || [ ! -f ${CONFIG_PATH} ]; then
+  echo "ERROR: Missing config path (-c)."
+  usage
+fi
+
+##
+# Build "crosstool-ng".
+##
+
+CTNG=${ROOT}/ct-ng
+mkdir -p "${CTNG}"
+cd "${CTNG}"
+
+# Download and install the "crosstool-ng" source.
+REV=1.23.0
+wget --progress=bar:force \
+  "https://github.com/crosstool-ng/crosstool-ng/archive/crosstool-ng-${REV}.tar.gz"
+tar -xf "crosstool-ng-${REV}.tar.gz"
+cd "crosstool-ng-crosstool-ng-${REV}"
+
+# Bootstrap and install the tool.
+BOOTSTRAP_PREFIX="${CTNG}/prefix"
+./bootstrap
+./configure \
+  --prefix "${BOOTSTRAP_PREFIX}"
+make -j$(nproc)
+make install
+
+##
+# Use "crosstool-ng" to build the toolchain.
+##
+
+# Override installation prefix, since we want to define it externally.
+export CT_PREFIX
+
+# Allow installation as root, since we aren't really worried about system
+# damage b/c we're running in a container and this saves us the trouble of
+# having to generate a crosstool user.
+export CT_ALLOW_BUILD_AS_ROOT_SURE=1
+
+# Create our build directory and copy our configuration into it.
+BUILD="${ROOT}/toolchain"
+mkdir -p "${BUILD}"
+cd "${BUILD}"
+
+cp "${CONFIG_PATH}" "${BUILD}/.config"
+
+# Build and install the toolchain!
+"${BOOTSTRAP_PREFIX}/bin/ct-ng" build

linux-mips/Dockerfile.in

@@ -0,0 +1,42 @@
+FROM dockcross/base:latest
+
+# This is for 32-bit Big-Endian MIPS devices with hard floating point enabled
+
+#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 "mips-unknown-linux-gnu" target.
+ENV CROSS_TRIPLE mips-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
+
+ENV QEMU_LD_PREFIX "${CROSS_ROOT}/${CROSS_TRIPLE}/sysroot"
+ENV QEMU_SET_ENV "LD_LIBRARY_PATH=${CROSS_ROOT}/lib:${QEMU_LD_PREFIX}"
+
+ENV DEFAULT_DOCKCROSS_IMAGE dockcross/linux-mips
+
+COPY Toolchain.cmake ${CROSS_ROOT}/
+ENV CMAKE_TOOLCHAIN_FILE ${CROSS_ROOT}/Toolchain.cmake
+
+# Build-time metadata as defined at http://label-schema.org
+ARG BUILD_DATE
+ARG IMAGE
+ARG VCS_REF
+ARG VCS_URL
+LABEL org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.name=$IMAGE \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.vcs-url=$VCS_URL \
+      org.label-schema.schema-version="1.0"

linux-mips/Toolchain.cmake

@@ -0,0 +1,17 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR mips)
+
+set(cross_triple "mips-unknown-linux-gnu")
+set(cross_root /usr/xcc/${cross_triple})
+
+set(CMAKE_C_COMPILER ${cross_root}/bin/${cross_triple}-gcc)
+set(CMAKE_CXX_COMPILER ${cross_root}/bin/${cross_triple}-g++)
+set(CMAKE_Fortran_COMPILER ${cross_root}/bin/${cross_triple}-gfortran)
+
+set(CMAKE_FIND_ROOT_PATH ${cross_root}/lib ${cross_root}/${cross_triple}/lib)
+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_CROSSCOMPILING_EMULATOR /usr/bin/qemu-mips)

linux-mips/crosstool-ng.config

@@ -0,0 +1,519 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# Crosstool-NG Configuration
+#
+CT_CONFIGURE_has_static_link=y
+CT_CONFIGURE_has_wget=y
+CT_CONFIGURE_has_curl=y
+CT_CONFIGURE_has_stat_flavor_GNU=y
+CT_CONFIGURE_has_make_3_81_or_newer=y
+CT_CONFIGURE_has_libtoolize_2_4_or_newer=y
+CT_CONFIGURE_has_autoconf_2_63_or_newer=y
+CT_CONFIGURE_has_autoreconf_2_63_or_newer=y
+CT_CONFIGURE_has_gnu_m4_1_4_12_or_newer=y
+CT_CONFIGURE_has_git=y
+CT_MODULES=y
+
+#
+# Paths and misc options
+#
+
+#
+# crosstool-NG behavior
+#
+# CT_OBSOLETE is not set
+# CT_EXPERIMENTAL is not set
+# CT_DEBUG_CT is not set
+
+#
+# Paths
+#
+CT_LOCAL_TARBALLS_DIR="${HOME}/src"
+CT_SAVE_TARBALLS=y
+CT_WORK_DIR="${CT_TOP_DIR}/.build"
+CT_BUILD_TOP_DIR="${CT_WORK_DIR}/${CT_HOST:+HOST-${CT_HOST}/}${CT_TARGET}"
+CT_PREFIX_DIR="${CT_PREFIX:-${HOME}/x-tools}/${CT_HOST:+HOST-${CT_HOST}/}${CT_TARGET}"
+CT_RM_RF_PREFIX_DIR=y
+CT_REMOVE_DOCS=y
+CT_PREFIX_DIR_RO=y
+CT_STRIP_HOST_TOOLCHAIN_EXECUTABLES=y
+# CT_STRIP_TARGET_TOOLCHAIN_EXECUTABLES is not set
+
+#
+# Downloading
+#
+CT_DOWNLOAD_AGENT_WGET=y
+# CT_DOWNLOAD_AGENT_CURL is not set
+# CT_DOWNLOAD_AGENT_NONE is not set
+# CT_FORBID_DOWNLOAD is not set
+# CT_FORCE_DOWNLOAD is not set
+CT_CONNECT_TIMEOUT=10
+CT_DOWNLOAD_WGET_OPTIONS="--passive-ftp --tries=3 -nc --progress=dot:binary"
+# CT_ONLY_DOWNLOAD is not set
+# CT_USE_MIRROR is not set
+
+#
+# Extracting
+#
+# CT_FORCE_EXTRACT is not set
+CT_OVERRIDE_CONFIG_GUESS_SUB=y
+# CT_ONLY_EXTRACT is not set
+CT_PATCH_BUNDLED=y
+# CT_PATCH_LOCAL is not set
+# CT_PATCH_BUNDLED_LOCAL is not set
+# CT_PATCH_LOCAL_BUNDLED is not set
+# CT_PATCH_BUNDLED_FALLBACK_LOCAL is not set
+# CT_PATCH_LOCAL_FALLBACK_BUNDLED is not set
+# CT_PATCH_NONE is not set
+CT_PATCH_ORDER="bundled"
+
+#
+# Build behavior
+#
+CT_PARALLEL_JOBS=0
+CT_LOAD=""
+CT_USE_PIPES=y
+CT_EXTRA_CFLAGS_FOR_BUILD=""
+CT_EXTRA_LDFLAGS_FOR_BUILD=""
+CT_EXTRA_CFLAGS_FOR_HOST=""
+CT_EXTRA_LDFLAGS_FOR_HOST=""
+# CT_CONFIG_SHELL_SH is not set
+# CT_CONFIG_SHELL_ASH is not set
+CT_CONFIG_SHELL_BASH=y
+# CT_CONFIG_SHELL_CUSTOM is not set
+CT_CONFIG_SHELL="${bash}"
+
+#
+# Logging
+#
+# CT_LOG_ERROR is not set
+# CT_LOG_WARN is not set
+# CT_LOG_INFO is not set
+CT_LOG_EXTRA=y
+# CT_LOG_ALL is not set
+# CT_LOG_DEBUG is not set
+CT_LOG_LEVEL_MAX="EXTRA"
+# CT_LOG_SEE_TOOLS_WARN is not set
+CT_LOG_PROGRESS_BAR=y
+CT_LOG_TO_FILE=y
+CT_LOG_FILE_COMPRESS=y
+
+#
+# Target options
+#
+CT_ARCH="mips"
+# CT_ARCH_alpha is not set
+# CT_ARCH_arm is not set
+# CT_ARCH_avr is not set
+# CT_ARCH_m68k is not set
+CT_ARCH_mips=y
+# CT_ARCH_nios2 is not set
+# CT_ARCH_powerpc is not set
+# CT_ARCH_s390 is not set
+# CT_ARCH_sh is not set
+# CT_ARCH_sparc is not set
+# CT_ARCH_x86 is not set
+# CT_ARCH_xtensa is not set
+CT_ARCH_alpha_AVAILABLE=y
+CT_ARCH_arm_AVAILABLE=y
+CT_ARCH_avr_AVAILABLE=y
+CT_ARCH_m68k_AVAILABLE=y
+CT_ARCH_microblaze_AVAILABLE=y
+CT_ARCH_mips_AVAILABLE=y
+CT_ARCH_nios2_AVAILABLE=y
+CT_ARCH_powerpc_AVAILABLE=y
+CT_ARCH_s390_AVAILABLE=y
+CT_ARCH_sh_AVAILABLE=y
+CT_ARCH_sparc_AVAILABLE=y
+CT_ARCH_x86_AVAILABLE=y
+CT_ARCH_xtensa_AVAILABLE=y
+CT_ARCH_SUFFIX=""
+
+#
+# Generic target options
+#
+# CT_MULTILIB is not set
+CT_DEMULTILIB=y
+CT_ARCH_USE_MMU=y
+CT_ARCH_SUPPORTS_BOTH_ENDIAN=y
+CT_ARCH_DEFAULT_BE=y
+CT_ARCH_BE=y
+# CT_ARCH_LE is not set
+CT_ARCH_ENDIAN="big"
+CT_ARCH_SUPPORTS_32=y
+CT_ARCH_SUPPORTS_64=y
+CT_ARCH_DEFAULT_32=y
+CT_ARCH_BITNESS=32
+CT_ARCH_32=y
+# CT_ARCH_64 is not set
+
+#
+# Target optimisations
+#
+CT_ARCH_SUPPORTS_WITH_ARCH=y
+CT_ARCH_SUPPORTS_WITH_TUNE=y
+CT_ARCH_SUPPORTS_WITH_FLOAT=y
+CT_ARCH_ARCH=""
+CT_ARCH_TUNE=""
+# CT_ARCH_FLOAT_AUTO is not set
+CT_ARCH_FLOAT_HW=y
+# CT_ARCH_FLOAT_SW is not set
+CT_TARGET_CFLAGS=""
+CT_TARGET_LDFLAGS=""
+CT_ARCH_FLOAT="hard"
+
+#
+# mips other options
+#
+CT_ARCH_mips_o32=y
+CT_ARCH_mips_ABI="32"
+
+#
+# Toolchain options
+#
+
+#
+# General toolchain options
+#
+CT_FORCE_SYSROOT=y
+CT_USE_SYSROOT=y
+CT_SYSROOT_NAME="sysroot"
+CT_SYSROOT_DIR_PREFIX=""
+CT_WANTS_STATIC_LINK=y
+CT_WANTS_STATIC_LINK_CXX=y
+# CT_STATIC_TOOLCHAIN is not set
+CT_TOOLCHAIN_PKGVERSION=""
+CT_TOOLCHAIN_BUGURL=""
+
+#
+# Tuple completion and aliasing
+#
+CT_TARGET_VENDOR=""
+CT_TARGET_ALIAS_SED_EXPR="s/-unknown//"
+CT_TARGET_ALIAS=""
+
+#
+# Toolchain type
+#
+CT_CROSS=y
+# CT_CANADIAN is not set
+CT_TOOLCHAIN_TYPE="cross"
+
+#
+# Build system
+#
+CT_BUILD=""
+CT_BUILD_PREFIX=""
+CT_BUILD_SUFFIX=""
+
+#
+# Misc options
+#
+# CT_TOOLCHAIN_ENABLE_NLS is not set
+
+#
+# Operating System
+#
+CT_KERNEL_SUPPORTS_SHARED_LIBS=y
+CT_KERNEL="linux"
+CT_KERNEL_VERSION="4.10.8"
+# CT_KERNEL_bare_metal is not set
+CT_KERNEL_linux=y
+CT_KERNEL_bare_metal_AVAILABLE=y
+CT_KERNEL_linux_AVAILABLE=y
+# CT_KERNEL_LINUX_CUSTOM is not set
+CT_KERNEL_V_4_10=y
+# CT_KERNEL_V_4_9 is not set
+# CT_KERNEL_V_4_4 is not set
+# CT_KERNEL_V_4_1 is not set
+# CT_KERNEL_V_3_16 is not set
+# CT_KERNEL_V_3_12 is not set
+# CT_KERNEL_V_3_10 is not set
+# CT_KERNEL_V_3_4 is not set
+# CT_KERNEL_V_3_2 is not set
+CT_KERNEL_windows_AVAILABLE=y
+
+#
+# Common kernel options
+#
+CT_SHARED_LIBS=y
+
+#
+# linux other options
+#
+CT_KERNEL_LINUX_VERBOSITY_0=y
+# CT_KERNEL_LINUX_VERBOSITY_1 is not set
+# CT_KERNEL_LINUX_VERBOSITY_2 is not set
+CT_KERNEL_LINUX_VERBOSE_LEVEL=0
+CT_KERNEL_LINUX_INSTALL_CHECK=y
+
+#
+# Binary utilities
+#
+CT_ARCH_BINFMT_ELF=y
+CT_BINUTILS="binutils"
+CT_BINUTILS_binutils=y
+
+#
+# GNU binutils
+#
+CT_BINUTILS_VERSION="2.28"
+# CT_BINUTILS_SHOW_LINARO is not set
+CT_BINUTILS_V_2_28=y
+# CT_BINUTILS_V_2_27 is not set
+# CT_BINUTILS_V_2_26 is not set
+CT_BINUTILS_2_27_or_later=y
+CT_BINUTILS_2_26_or_later=y
+CT_BINUTILS_2_25_1_or_later=y
+CT_BINUTILS_2_25_or_later=y
+CT_BINUTILS_2_24_or_later=y
+CT_BINUTILS_2_23_2_or_later=y
+CT_BINUTILS_HAS_HASH_STYLE=y
+CT_BINUTILS_HAS_GOLD=y
+CT_BINUTILS_HAS_PLUGINS=y
+CT_BINUTILS_HAS_PKGVERSION_BUGURL=y
+CT_BINUTILS_FORCE_LD_BFD_DEFAULT=y
+CT_BINUTILS_LINKER_LD=y
+CT_BINUTILS_LINKERS_LIST="ld"
+CT_BINUTILS_LINKER_DEFAULT="bfd"
+CT_BINUTILS_PLUGINS=y
+CT_BINUTILS_EXTRA_CONFIG_ARRAY=""
+# CT_BINUTILS_FOR_TARGET is not set
+
+#
+# binutils other options
+#
+
+#
+# C-library
+#
+CT_LIBC="glibc"
+CT_LIBC_VERSION="2.25"
+CT_LIBC_glibc=y
+# CT_LIBC_uClibc is not set
+CT_LIBC_avr_libc_AVAILABLE=y
+CT_LIBC_glibc_AVAILABLE=y
+CT_THREADS="nptl"
+# CT_CC_GLIBC_SHOW_LINARO is not set
+CT_LIBC_GLIBC_V_2_25=y
+# CT_LIBC_GLIBC_V_2_24 is not set
+# CT_LIBC_GLIBC_V_2_23 is not set
+CT_LIBC_GLIBC_2_23_or_later=y
+CT_LIBC_GLIBC_2_20_or_later=y
+CT_LIBC_GLIBC_2_17_or_later=y
+CT_LIBC_mingw_AVAILABLE=y
+CT_LIBC_musl_AVAILABLE=y
+CT_LIBC_newlib_AVAILABLE=y
+CT_LIBC_none_AVAILABLE=y
+CT_LIBC_uClibc_AVAILABLE=y
+CT_LIBC_SUPPORT_THREADS_ANY=y
+CT_LIBC_SUPPORT_THREADS_NATIVE=y
+
+#
+# Common C library options
+#
+CT_THREADS_NATIVE=y
+# CT_CREATE_LDSO_CONF is not set
+CT_LIBC_XLDD=y
+
+#
+# glibc other options
+#
+CT_LIBC_GLIBC_NEEDS_PORTS=y
+CT_LIBC_glibc_family=y
+CT_LIBC_GLIBC_EXTRA_CONFIG_ARRAY=""
+CT_LIBC_GLIBC_CONFIGPARMS=""
+CT_LIBC_GLIBC_EXTRA_CFLAGS=""
+# CT_LIBC_DISABLE_VERSIONING is not set
+CT_LIBC_OLDEST_ABI=""
+CT_LIBC_GLIBC_FORCE_UNWIND=y
+CT_LIBC_ADDONS_LIST=""
+# CT_LIBC_LOCALES is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_NONE is not set
+CT_LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS=y
+# CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN is not set
+CT_LIBC_GLIBC_MIN_KERNEL="4.10.8"
+
+#
+# C compiler
+#
+CT_CC="gcc"
+CT_CC_CORE_PASSES_NEEDED=y
+CT_CC_CORE_PASS_1_NEEDED=y
+CT_CC_CORE_PASS_2_NEEDED=y
+CT_CC_gcc=y
+CT_CC_GCC_VERSION="6.3.0"
+# CT_CC_GCC_SHOW_LINARO is not set
+CT_CC_GCC_V_6_3_0=y
+# CT_CC_GCC_V_5_4_0 is not set
+# CT_CC_GCC_V_4_9_4 is not set
+CT_CC_GCC_4_8_or_later=y
+CT_CC_GCC_4_9_or_later=y
+CT_CC_GCC_5_or_later=y
+CT_CC_GCC_6=y
+CT_CC_GCC_6_or_later=y
+CT_CC_GCC_ENABLE_PLUGINS=y
+CT_CC_GCC_HAS_LIBMPX=y
+CT_CC_GCC_ENABLE_CXX_FLAGS=""
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_STATIC_LIBSTDCXX=y
+# CT_CC_GCC_SYSTEM_ZLIB is not set
+CT_CC_GCC_CONFIG_TLS=m
+
+#
+# Optimisation features
+#
+CT_CC_GCC_USE_GRAPHITE=y
+CT_CC_GCC_USE_LTO=y
+
+#
+# Settings for libraries running on target
+#
+CT_CC_GCC_ENABLE_TARGET_OPTSPACE=y
+# CT_CC_GCC_LIBMUDFLAP is not set
+# CT_CC_GCC_LIBGOMP is not set
+# CT_CC_GCC_LIBSSP is not set
+# CT_CC_GCC_LIBQUADMATH is not set
+# CT_CC_GCC_LIBSANITIZER is not set
+
+#
+# Misc. obscure options.
+#
+CT_CC_CXA_ATEXIT=y
+# CT_CC_GCC_DISABLE_PCH is not set
+CT_CC_GCC_SJLJ_EXCEPTIONS=m
+CT_CC_GCC_LDBL_128=m
+# CT_CC_GCC_BUILD_ID is not set
+CT_CC_GCC_LNK_HASH_STYLE_DEFAULT=y
+# CT_CC_GCC_LNK_HASH_STYLE_SYSV is not set
+# CT_CC_GCC_LNK_HASH_STYLE_GNU is not set
+# CT_CC_GCC_LNK_HASH_STYLE_BOTH is not set
+CT_CC_GCC_LNK_HASH_STYLE=""
+CT_CC_GCC_DEC_FLOAT_AUTO=y
+# CT_CC_GCC_DEC_FLOAT_BID is not set
+# CT_CC_GCC_DEC_FLOAT_DPD is not set
+# CT_CC_GCC_DEC_FLOATS_NO is not set
+CT_CC_GCC_HAS_ARCH_OPTIONS=y
+
+#
+# archictecture-specific options
+#
+CT_CC_GCC_mips_llsc=m
+CT_CC_GCC_mips_synci=m
+CT_CC_GCC_mips_plt=y
+CT_CC_SUPPORT_CXX=y
+CT_CC_SUPPORT_FORTRAN=y
+CT_CC_SUPPORT_JAVA=y
+CT_CC_SUPPORT_ADA=y
+CT_CC_SUPPORT_OBJC=y
+CT_CC_SUPPORT_OBJCXX=y
+CT_CC_SUPPORT_GOLANG=y
+
+#
+# Additional supported languages:
+#
+CT_CC_LANG_CXX=y
+# CT_CC_LANG_FORTRAN is not set
+# CT_CC_LANG_JAVA is not set
+
+#
+# Debug facilities
+#
+# CT_DEBUG_duma is not set
+CT_DEBUG_gdb=y
+CT_GDB_CROSS=y
+# CT_GDB_CROSS_STATIC is not set
+# CT_GDB_CROSS_SIM is not set
+# CT_GDB_CROSS_PYTHON is not set
+CT_GDB_CROSS_EXTRA_CONFIG_ARRAY=""
+# CT_GDB_NATIVE is not set
+CT_GDB_GDBSERVER=y
+CT_GDB_GDBSERVER_HAS_IPA_LIB=y
+# CT_GDB_GDBSERVER_BUILD_IPA_LIB is not set
+
+#
+# gdb version
+#
+CT_GDB_VERSION="7.12.1"
+CT_GDB_V_7_12_1=y
+# CT_GDB_V_7_11_1 is not set
+CT_GDB_7_12_or_later=y
+CT_GDB_7_2_or_later=y
+CT_GDB_7_0_or_later=y
+CT_GDB_HAS_PKGVERSION_BUGURL=y
+CT_GDB_HAS_PYTHON=y
+CT_GDB_INSTALL_GDBINIT=y
+# CT_DEBUG_ltrace is not set
+# CT_DEBUG_strace is not set
+
+#
+# Companion libraries
+#
+CT_COMPLIBS_NEEDED=y
+CT_LIBICONV_NEEDED=y
+CT_GETTEXT_NEEDED=y
+CT_GMP_NEEDED=y
+CT_MPFR_NEEDED=y
+CT_ISL_NEEDED=y
+CT_MPC_NEEDED=y
+CT_EXPAT_NEEDED=y
+CT_NCURSES_NEEDED=y
+CT_COMPLIBS=y
+CT_LIBICONV=y
+CT_GETTEXT=y
+CT_GMP=y
+CT_MPFR=y
+CT_ISL=y
+CT_MPC=y
+CT_EXPAT=y
+CT_NCURSES=y
+# CT_ZLIB is not set
+CT_LIBICONV_V_1_15=y
+# CT_LIBICONV_V_1_14 is not set
+CT_LIBICONV_VERSION="1.15"
+CT_GETTEXT_V_0_19_8_1=y
+CT_GETTEXT_VERSION="0.19.8.1"
+CT_GMP_V_6_1_2=y
+CT_GMP_5_0_2_or_later=y
+CT_GMP_VERSION="6.1.2"
+CT_MPFR_V_3_1_5=y
+CT_MPFR_VERSION="3.1.5"
+CT_ISL_V_0_16_1=y
+# CT_ISL_V_0_15 is not set
+CT_ISL_V_0_16_or_later=y
+CT_ISL_V_0_15_or_later=y
+CT_ISL_V_0_14_or_later=y
+CT_ISL_V_0_12_or_later=y
+CT_ISL_VERSION="0.16.1"
+CT_MPC_V_1_0_3=y
+CT_MPC_VERSION="1.0.3"
+CT_EXPAT_V_2_2_0=y
+CT_EXPAT_VERSION="2.2.0"
+CT_NCURSES_V_6_0=y
+CT_NCURSES_VERSION="6.0"
+CT_NCURSES_HOST_CONFIG_ARGS=""
+CT_NCURSES_HOST_DISABLE_DB=y
+CT_NCURSES_HOST_FALLBACKS="linux,xterm,xterm-color,xterm-256color,vt100"
+CT_NCURSES_TARGET_CONFIG_ARGS=""
+# CT_NCURSES_TARGET_DISABLE_DB is not set
+CT_NCURSES_TARGET_FALLBACKS=""
+
+#
+# Companion libraries common options
+#
+# CT_COMPLIBS_CHECK is not set
+
+#
+# Companion tools
+#
+# CT_COMP_TOOLS_FOR_HOST is not set
+# CT_COMP_TOOLS_autoconf is not set
+CT_COMP_TOOLS_automake=y
+CT_AUTOMAKE_V_1_15=y
+CT_AUTOMAKE_VERSION="1.15"
+CT_COMP_TOOLS_libtool=y
+CT_LIBTOOL_V_2_4_6=y
+CT_LIBTOOL_VERSION="2.4.6"
+# CT_COMP_TOOLS_m4 is not set
+# CT_COMP_TOOLS_make is not set