Updated first batch of instructions for x86_64.

plain-text/x86_64-chunks/000-Preparation

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+# perform as root:
+export MLFS=/mnt/mlfs
+mkdir -pv $MLFS
+mkdir -v $MLFS/sources
+chmod -v a+wt $MLFS/sources
+
+#download sources + patches
+
+mkdir -v $MLFS/cross-tools
+mkdir -v $MLFS/tools
+ln -sv   $MLFS/cross-tools /
+ln -sv   $MLFS/tools /
+
+groupadd mlfs
+useradd -s /bin/bash -g mlfs -m -k /dev/null mlfs
+passwd mlfs
+
+chown -v mlfs $MLFS/cross-tools
+chown -v mlfs $MLFS/sources
+chown -v mlfs $MLFS/tools
+
+# Now run as mlfs user
+su - mlfs
+
+cat > ~/.bash_profile << "EOF"
+exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\n\$ ' /bin/bash
+EOF
+
+cat > ~/.bashrc << "EOF"
+set +h
+umask 022
+MLFS=/mnt/mlfs
+LC_ALL=POSIX
+PATH=/cross-tools/bin:/tools/bin:/bin:/usr/bin
+export MLFS LC_ALL MLFS_TGT PATH
+EOF
+
+source ~/.bash_profile
+
+#CFLAGS and CXXFLAGS must not be set during the building of cross-tools. 
+unset CFLAGS
+unset CXXFLAGS
+cat >> ~/.bashrc << EOF
+unset CFLAGS
+unset CXXFLAGS
+EOF
+
+#Build Variables:
+export MLFS_HOST="$(echo $MACHTYPE | \
+    sed "s/$(echo $MACHTYPE | cut -d- -f2)/cross/")"
+export MLFS_TARGET="x86_64-linux-musl"
+cat >> ~/.bashrc << EOF
+export MLFS_HOST="${MLFS_HOST}"
+export MLFS_TARGET="${MLFS_TARGET}"
+export MLFS_ARCH=x86
+export MLFS_CPU=x86-64
+EOF
+source ~/.bashrc
+
+# the next are done as mlfs user

plain-text/x86_64-chunks/001-Cross-Tools-Kernel_Headers

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+# Cross-Tools: Kernel Headers
+# build & install as user mlfs
+
+make mrproper
+make ARCH=${MLFS_ARCH} headers_check
+make ARCH=${MLFS_ARCH} INSTALL_HDR_PATH=/cross-tools/${MLFS_TARGET} headers_install

plain-text/x86_64-chunks/002-Cross-Tools-Binutils

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+# Cross-Tools: Binutils
+# Build and install as mlfs
+
+mkdir -v build && cd build
+../configure \
+   --prefix=/cross-tools --target=${MLFS_TARGET} \
+   --with-sysroot=/cross-tools/${MLFS_TARGET} \
+   --disable-nls --disable-multilib \
+   --disable-werror \
+   --disable-ppl-version-check \
+   --disable-cloog-version-check \
+   --enable-deterministic-archives \
+   --disable-compressed-debug-sections 
+make configure-host
+make && make install

plain-text/x86_64-chunks/003-Cross-Tools-GCC-Static

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+# Cross-Tools: GCC STATIC
+# Build and install as mlfs
+
+tar -xf ../mpfr-4.0.1.tar.xz
+mv -v mpfr-4.0.1 mpfr
+tar -xf ../gmp-6.1.2.tar.xz
+mv -v gmp-6.1.2 gmp
+tar -xf ../mpc-1.1.0.tar.gz
+mv -v mpc-1.1.0 mpc
+mkdir -v build && cd  build
+../configure \
+	  --prefix=/cross-tools --build=${MLFS_HOST} \
+	  --host=${MLFS_HOST}   --target=${MLFS_TARGET} \
+	  --with-sysroot=/cross-tools/${MLFS_TARGET} \
+	  --disable-nls  --with-newlib --without-ppl \
+	  --without-cloog      --disable-libmpx \
+	  --disable-libitm     --disable-libvtv \
+	  --disable-libssp     --disable-shared \
+	  --disable-libgomp    --without-headers \
+	  --disable-threads    --disable-multilib \
+	  --disable-libatomic  --disable-libstdcxx \
+	  --disable-libmudflap --disable-libcilkrts \
+	  --enable-languages=c --disable-libquadmath \
+	  --disable-libsanitizer --with-arch=${MLFS_CPU} \
+	  --disable-decimal-float --enable-clocale=generic \
+	  --disable-gnu-indirect-function  
+make all-gcc all-target-libgcc
+make install-gcc install-target-libgcc

plain-text/x86_64-chunks/004-Cross-Tools-Musl

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+# Cross-Tools: Musl
+# Build and install as mlfs
+
+./configure \
+  CROSS_COMPILE=${MLFS_TARGET}- \
+  --prefix=/ \
+  --target=${MLFS_TARGET} 
+make && DESTDIR=/cross-tools make install
+mkdir -v /cross-tools/usr
+ln -sv ../include  /cross-tools/usr/include

plain-text/x86_64-chunks/005-Cross-Tools-GCC-Final

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+# Cross-Tools: GCC-8.2.0 Final
+# Build and install as mlfs
+
+tar -xf ../mpfr-4.0.1.tar.xz
+mv -v mpfr-4.0.1 mpfr
+tar -xf ../gmp-6.1.2.tar.xz
+mv -v gmp-6.1.2 gmp
+tar -xf ../mpc-1.1.0.tar.gz
+mv -v mpc-1.1.0 mpc
+
+# Apply patches [from void-linux]
+patch -Np0 -i ../gcc-8.2.0-void-0016-invalid_tls_model.diff
+patch -Np0 -i ../gcc-8.2.0-void-fix-cxxflags-passing.patch
+patch -Np0 -i ../gcc-8.2.0-void-fix-musl-execinfo.patch	
+patch -Np0 -i ../gcc-8.2.0-void-no-stack_chk_fail_local.patch
+
+mkdir build && cd  build
+AR=ar LDFLAGS="-Wl,-rpath,/cross-tools/lib" \
+../configure \
+    --prefix=/cross-tools \
+    --build=${MLFS_HOST} \
+    --host=${MLFS_HOST} \
+    --target=${MLFS_TARGET} \
+    --disable-multilib \
+    --with-sysroot=/cross-tools \
+    --disable-nls \
+    --enable-shared \
+    --enable-languages=c,c++ \
+    --enable-__cxa_atexit \
+    --enable-c99 \
+    --enable-long-long \
+    --enable-threads=posix \
+    --enable-clocale=generic \
+    --enable-libstdcxx-time \
+    --enable-checking=release \
+    --enable-fully-dynamic-string \
+    --disable-symvers \
+    --disable-gnu-indirect-function \
+    --disable-libmudflap \
+    --disable-libsanitizer \
+    --disable-libmpx \
+    --disable-lto-plugin \
+    --disable-libssp 
+
+make AS_FOR_TARGET="${MLFS_TARGET}-as" \
+    LD_FOR_TARGET="${MLFS_TARGET}-ld"
+
+make install

plain-text/x86_64-chunks/006-Cross-Tools-File

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+# Cross-Tools: File
+# Build and install as mlfs
+
+./configure --prefix=/cross-tools
+make && make install
+
+# Optional: Backup cross-tools

plain-text/x86_64-chunks/007-Tool_Chain-Binutils_Pass1

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+# Tool Chain: Binutils PASS 1 of 2
+# Build and install as mlfs
+
+export CC="${MLFS_TARGET}-gcc"
+export CXX="${MLFS_TARGET}-g++"
+export AR="${MLFS_TARGET}-ar"
+export AS="${MLFS_TARGET}-as"
+export RANLIB="${MLFS_TARGET}-ranlib"
+export LD="${MLFS_TARGET}-ld"
+export STRIP="${MLFS_TARGET}-strip"
+
+mkdir -v build && cd build
+../configure --prefix=/tools            \
+             --with-sysroot=$MLFS        \
+             --with-lib-path=/tools/lib \
+             --build=${MLFS_HOST} \
+             --host=${MLFS_TARGET} \
+             --target=${MLFS_TARGET}          \
+             --disable-nls              \
+             --disable-werror
+
+make && make install
+
+make -C ld clean
+make -C ld LIB_PATH=/tools/lib
+cp -v ld/ld-new /tools/bin

plain-text/x86_64-chunks/008-Tool_Chain-GCC_Pass1

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+# Tool Chain: GCC-8.2.0 PASS 1 of 2
+# Build and install as mlfs
+
+export CC="${MLFS_TARGET}-gcc"
+export CXX="${MLFS_TARGET}-g++"
+export AR="${MLFS_TARGET}-ar"
+export AS="${MLFS_TARGET}-as"
+export RANLIB="${MLFS_TARGET}-ranlib"
+export LD="${MLFS_TARGET}-ld"
+export STRIP="${MLFS_TARGET}-strip"
+
+tar -xf ../mpfr-4.0.1.tar.xz
+mv -v mpfr-4.0.1 mpfr
+tar -xf ../gmp-6.1.2.tar.xz
+mv -v gmp-6.1.2 gmp
+tar -xf ../mpc-1.1.0.tar.gz
+mv -v mpc-1.1.0 mpc
+
+patch -Np0 -i ../gcc-8.2.0-void-0016-invalid_tls_model.diff
+patch -Np0 -i ../gcc-8.2.0-void-fix-cxxflags-passing.patch
+patch -Np0 -i ../gcc-8.2.0-void-fix-musl-execinfo.patch 
+patch -Np0 -i ../gcc-8.2.0-void-no-stack_chk_fail_local.patch
+
+
+#change the location of GCC's default dynamic linker to use the one installed in /tools
+for file in gcc/config/{linux,i386/linux{,64}}.h
+do
+  cp -uv $file{,.orig}
+  sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&@g' \
+      -e 's@/usr@/tools@g' $file.orig > $file
+  echo '
+#undef STANDARD_STARTFILE_PREFIX_1
+#undef STANDARD_STARTFILE_PREFIX_2
+#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
+#define STANDARD_STARTFILE_PREFIX_2 ""' >> $file
+  touch $file.orig
+done
+
+case $(uname -m) in
+  x86_64)
+    sed -e '/m64=/s/lib64/lib/' \
+        -i.orig gcc/config/i386/t-linux64
+ ;;
+esac
+
+mkdir -v build && cd build
+../configure                                       \
+    --target=${MLFS_TARGET}                        \
+    --build=${MLFS_HOST} \
+    --host=${MLFS_TARGET} \
+    --prefix=/tools                                \
+    --with-sysroot=$MLFS                            \
+    --with-newlib                                  \
+    --without-headers                              \
+    --with-local-prefix=/tools                     \
+    --with-native-system-header-dir=/tools/include \
+    --disable-nls                                  \
+    --disable-shared                               \
+    --disable-multilib                             \
+    --disable-threads                              \
+    --disable-libatomic                            \
+    --disable-libgomp                              \
+    --disable-libmpx                               \
+    --disable-libquadmath                          \
+    --disable-libssp                               \
+    --disable-libvtv                               \
+    --disable-libstdcxx                            \
+    --enable-languages=c,c++ \
+    --disable-libstdcxx-pch \
+    --disable-symvers \
+    --disable-libitm \
+    --disable-gnu-indirect-function \
+    --disable-libmudflap \
+    --disable-libsanitizer \
+    --disable-libcilkrts
+## Will not build unless $PATH is switched from /cross-tools/bin:/tools/bin:/bin:/usr/bin to 
+## /bin:/usr/bin:/cross-tools/bin:/tools/bin
+export PATH=/bin:/usr/bin:/cross-tools/bin:/tools/bin
+make &&  make install
+
+export PATH=/cross-tools/bin:/tools/bin:/bin:/usr/bin

plain-text/x86_64-chunks/009-Tool_Chain-Kernel_Headers

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+# Tool Chain: Kernel Headers
+# Build and install as mlfs
+
+make mrproper
+
+PATH=/bin:/usr/bin:/cross-tools/bin:/tools/bin \
+MLFS_ARCH=x86 make INSTALL_HDR_PATH=dest headers_install
+find dest/include \( -name .install -o -name ..install.cmd \) -delete
+
+#If not present
+#mkdir -v /tools/include
+cp -rv dest/include/* /tools/include

plain-text/x86_64-chunks/010-Tool_Chain-Adjust_Tool_Chain

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+# Tool Chain: Adjust Tool Chain
+# Edit as mlfs
+
+mv -v /tools/bin/{ld,ld-old}
+mv -v /tools/$(${MLFS_TARGET}-gcc -dumpmachine)/bin/{ld,ld-old}
+mv -v /tools/bin/{ld-new,ld}
+ln -sv /tools/bin/ld /tools/$(${MLFS_TARGET}-gcc -dumpmachine)/bin/ld
+
+SPECFILE=`dirname $(${MLFS_TARGET}-gcc -print-libgcc-file-name)`/specs &&
+${MLFS_TARGET}-gcc -dumpspecs > tempspecfile
+#modify file for every /lib/ld-musl-x86_64.so.1 to /tools/lib/ld-musl-x86_64.so.1
+mv -vf tempspecfile $SPECFILE &&
+unset SPECFILE
+
+GCC_INCLUDEDIR=`dirname $(${MLFS_TARGET}-gcc -print-libgcc-file-name)`/include &&
+find ${GCC_INCLUDEDIR}/* -maxdepth 0 -xtype d -exec rm -rvf '{}' \; &&
+rm -vf `grep -l "DO NOT EDIT THIS FILE" ${GCC_INCLUDEDIR}/*` &&
+unset GCC_INCLUDEDIR

plain-text/x86_64-chunks/011-Tool_Chain-Musl

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+# Tool Chain: Musl
+# Build and install as mlfs
+
+./configure \
+  CROSS_COMPILE=${MLFS_TARGET}- \
+  --prefix=/ \
+  --target=${MLFS_TARGET} 
+make && make DESTDIR=/tools install
+
+#make sure symlink is valid: /tools/lib/ld-musl-x86_64.so.1 to /tools/lib/libc.so
+rm -v /tools/lib/ld-musl-x86_64.so.1
+ln -sv libc.so /tools/lib/ld-musl-x86_64.so.1

plain-text/x86_64-chunks/012-Tool_Chain-Libstdcxx

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+# Tool Chain: Libstdc++ 8.2.0
+# Build and install as mlfs
+
+export CC="${MLFS_TARGET}-gcc"
+export CXX="${MLFS_TARGET}-g++"
+export AR="${MLFS_TARGET}-ar"
+export AS="${MLFS_TARGET}-as"
+export RANLIB="${MLFS_TARGET}-ranlib"
+export LD="${MLFS_TARGET}-ld"
+export STRIP="${MLFS_TARGET}-strip"
+
+# Apply patches [from void-linux]
+patch -Np0 -i ../gcc-8.2.0-void-0016-invalid_tls_model.diff
+patch -Np0 -i ../gcc-8.2.0-void-fix-cxxflags-passing.patch
+patch -Np0 -i ../gcc-8.2.0-void-fix-musl-execinfo.patch 
+patch -Np0 -i ../gcc-8.2.0-void-no-stack_chk_fail_local.patch
+
+mkdir -v build && cd build
+../libstdc++-v3/configure           \
+    --target=${MLFS_TARGET}         \
+    --build=${MLFS_HOST}            \
+    --host=${MLFS_TARGET}           \
+    --prefix=/tools                 \
+    --disable-multilib              \
+    --disable-nls                   \
+    --disable-libstdcxx-threads     \
+    --disable-libstdcxx-pch         \
+    --with-gxx-include-dir=/tools/${MLFS_TARGET}/include/c++/8.2.0
+
+make && make install