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diff --git a/extra/source/rust-for-mozilla/rust.SlackBuild b/extra/source/rust-for-mozilla/rust.SlackBuild
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+#!/bin/bash
+
+# Copyright 2017  Andrew Clemons, Wellington, New Zealand
+# Copyright 2017, 2018, 2019, 2020, 2021  Patrick J. Volkerding, Sebeka, Minnesota, USA
+# Copyright 2017  Stuart Winter
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+cd $(dirname $0) ; CWD=$(pwd)
+
+PKGNAM=rust
+SRCNAM="${PKGNAM}c"
+VERSION=${VERSION:-1.54.0}
+BUILD=${BUILD:-3}
+
+# Set this to YES to build with the system LLVM, or NO to use the bundled LLVM.
+# YES is probably better (when it works...)
+SYSTEM_LLVM=${SYSTEM_LLVM:-NO}
+
+# Bootstrap variables (might not be kept updated for latest Rust):
+RSTAGE0_VERSION=${RSTAGE0_VERSION:-1.53.0}
+RSTAGE0_DIR=${RSTAGE0_DIR:-2021-06-17}
+CSTAGE0_VERSION=${CSTAGE0_VERSION:-1.53.0}
+CSTAGE0_DIR=${CSTAGE0_DIR:-$RSTAGE0_DIR}
+
+# Automatically determine the architecture we're building on:
+MARCH=$( uname -m )
+if [ -z "$ARCH" ]; then
+  case "$MARCH" in
+    i?86)    export ARCH=i686 ;;
+    armv7hl) export ARCH=$MARCH ;;
+    arm*)    export ARCH=arm ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+    *)       export ARCH=$MARCH ;;
+  esac
+fi
+unset MARCH
+
+# For compiling i686 under an x86_64 kernel:
+if [ "$(uname -m)" = "x86_64" -a "$(file -L /usr/bin/gcc | grep 80386 | grep 32-bit)" != "" ]; then
+  ARCH=i686
+fi
+
+# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
+# the name of the created package would be, and then exit. This information
+# could be useful to other scripts.
+if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
+  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
+  exit 0
+fi
+
+# If the bootstrap binaries are present, use those. Otherwise bootstrap from
+# installed compiler.
+if /bin/ls *-unknown-linux-gnu.tar.?z 1> /dev/null 2> /dev/null ; then
+  LOCAL_BOOTSTRAP=no
+else
+  LOCAL_BOOTSTRAP=yes
+fi
+
+# https://forge.rust-lang.org/platform-support.html
+# Bootstrapping ARCH:
+if [ "$ARCH" = "i586" ]; then
+  if [ "$LOCAL_BOOTSTRAP" = "yes" ] ; then
+    if rustc -Vv | grep host | grep i586 > /dev/null ; then
+      BARCH="$ARCH"
+    else
+      BARCH="i686"
+      if case "$( uname -m )" in i586) true ;; *) false ;; esac ; then
+        echo "rust must be bootstrapped from an i686 machine"
+        exit 1
+      fi
+    fi
+  else
+    # i586 must be built on a i686 machine, since the bootstrap compiler is i686
+    BARCH="i686"
+    if case "$( uname -m )" in i586) true ;; *) false ;; esac ; then
+      echo "rust must be bootstrapped from an i686 machine"
+      exit 1
+    fi
+  fi
+  TARCH="$ARCH"
+elif [ "$ARCH" = "armv7hl" ]; then
+  BARCH="armv7"
+  TARCH="$BARCH"
+else
+  BARCH="$ARCH"
+  TARCH="$ARCH"
+fi
+
+# Bootstrapping ABI:
+if [ "$ARCH" = "armv7hl" ]; then
+  BABI="gnueabihf"
+else
+  BABI="gnu"
+fi
+
+TMP=${TMP:-/tmp}
+OUTPUT=${OUTPUT:-/tmp}
+PKG=$TMP/package-$PKGNAM
+
+# Not needed, as the build will automatically use as many jobs as there are
+# threads.
+#NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}
+
+if [ "$ARCH" = "i586" ]; then
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  LIBDIRSUFFIX="64"
+elif [ "$ARCH" = "armv7hl" ]; then
+  LIBDIRSUFFIX=""
+else
+  LIBDIRSUFFIX=""
+fi
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $SRCNAM-$VERSION-src
+tar xvf $CWD/$SRCNAM-$VERSION-src.tar.?z || exit 1
+cd $SRCNAM-$VERSION-src || exit 1
+
+# Link with -lffi in case of using system LLVM:
+if [ "${SYSTEM_LLVM}" = "YES" ]; then
+  zcat $CWD/link_libffi.diff.gz | patch -p1 --verbose || exit 1
+fi
+
+if [ "$LOCAL_BOOTSTRAP" != "yes" ] ; then
+  # rust requires bootstrapping with the previous rust version.
+  # versions are defined in src/stage0.txt.
+  mkdir -p build/cache/$RSTAGE0_DIR
+  cp $CWD/$PKGNAM-std-$RSTAGE0_VERSION-$BARCH-unknown-linux-gnu.tar.?z \
+     $CWD/$SRCNAM-$RSTAGE0_VERSION-$BARCH-unknown-linux-gnu.tar.?z \
+     build/cache/$RSTAGE0_DIR
+  mkdir -p build/cache/$CSTAGE0_DIR
+  cp $CWD/cargo-$CSTAGE0_VERSION-$BARCH-unknown-linux-gnu.tar.?z build/cache/$CSTAGE0_DIR
+fi
+
+# Build configuration:
+cat << EOF > config.toml
+[llvm]
+ccache = "/usr/bin/ccache"
+link-shared = true
+
+[build]
+build = "$BARCH-unknown-linux-$BABI"
+host = ["$TARCH-unknown-linux-$BABI"]
+target = ["$TARCH-unknown-linux-$BABI"]
+tools = ["analysis", "cargo", "clippy", "rls", "rustfmt", "src"]
+submodules = false
+vendor = true
+extended = true
+
+[install]
+prefix = "/usr"
+docdir = "doc/rust-$VERSION"
+libdir = "lib$LIBDIRSUFFIX"
+mandir = "man"
+
+[rust]
+codegen-units = 0
+channel = "stable"
+rpath = false
+codegen-tests = false
+ignore-git = true
+
+EOF
+
+if [ "${SYSTEM_LLVM}" = "YES" ]; then
+  cat << EOF >> config.toml
+# Add this stuff to build with the system LLVM:
+[target.i586-unknown-linux-gnu]
+llvm-config = "/usr/bin/llvm-config"
+
+[target.i686-unknown-linux-gnu]
+llvm-config = "/usr/bin/llvm-config"
+
+[target.x86_64-unknown-linux-gnu]
+llvm-config = "/usr/bin/llvm-config"
+
+[target.armv7-unknown-linux-gnueabihf]
+llvm-config = "/usr/bin/llvm-config"
+EOF
+fi
+
+if [ "$LOCAL_BOOTSTRAP" = "yes" ] ; then
+  sed -i "s|^\(extended = true\)$|\1\nrustc = \"/usr/bin/rustc\"\ncargo = \"/usr/bin/cargo\"|" config.toml
+fi
+
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \+ -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \+
+
+export PKG_CONFIG_ALLOW_CROSS=1
+
+if [ "$BARCH" = "i586" ] ; then
+  # when bootstrapping from i586 (rust already installed), also build a i686
+  # rustlib:
+  sed -i 's/^target =.*$/target = ["i686-unknown-linux-gnu"]/' config.toml
+elif [ "$BARCH" = "i686" ] ; then
+  if [ "$TARCH" = "i586" ] ; then
+    # this will cause some messages like:
+    # warning: redundant linker flag specified for library `m`
+    # but will keep the build from falling over when doing the stage1 compiler
+    # linking for the i586 compiler. seems the correct flags don't get passed
+    # through and we end up failures like:
+    # error: linking with `clang` failed: exit code: 1
+    # /tmp/SBo/rustc-1.20.0-src/build/i686-unknown-linux-gnu/stage1-rustc/i586-unknown-linux-gnu/release/deps/librustc_llvm-4ab259c9aed547db.so: undefined reference to `xxx`
+    export RUSTFLAGS="$RUSTFLAGS -C link-args=-lrt -ldl -lcurses -lpthread -lz -lm"
+  fi
+fi
+
+# Build and install:
+python3 ./x.py build || exit 1
+DESTDIR=$PKG python3 x.py install || exit 1
+
+# Eh, none of this is all that big. Might as well leave it around as a
+# reference.
+#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/components
+#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/install.log
+#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/manifest-*
+#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/rust-installer-version
+#rm -f $PKG/usr/lib$LIBDIRSUFFIX/rustlib/uninstall.sh
+# Make sure the paths are correct, though:
+sed -i "s,/tmp/package-rust/,/,g" $PKG/usr/lib$LIBDIRSUFFIX/rustlib/install.log $PKG/usr/lib$LIBDIRSUFFIX/rustlib/manifest-*
+# And a little compression doesn't hurt either:
+gzip -9 $PKG/usr/lib$LIBDIRSUFFIX/rustlib/manifest-*
+
+# Move bash completions to the system location:
+if [ -d $PKG/etc/bash_completion.d ]; then
+  mkdir -p $PKG/usr/share/bash-completion
+  mv $PKG/etc/bash_completion.d $PKG/usr/share/bash-completion/completions
+  rmdir $PKG/etc 2> /dev/null
+fi
+
+# Correct permissions on shared libraries:
+find $PKG/usr/lib$LIBDIRSUFFIX -name "*.so" -exec chmod 755 "{}" \+
+
+# Evidently there are a lot of duplicated libraries in this tree, so let's
+# try to save some space:
+( cd $PKG/usr/lib${LIBDIRSUFFIX}/rustlib/*-linux-gnu/lib && for file in *.so ; do if cmp -s $file ../../../$file ; then ln -sf ../../../$file .; fi; done )
+
+# Strip ELF objects:
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+# Commented out (for now) since we disable rpaths in config.toml:
+## Remove any compiled-in RPATHs:
+#find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+#  | cut -f 1 -d : | while read elfobject ; do
+#  patchelf --remove-rpath $elfobject || exit 1
+#done
+
+# Compress man pages:
+find $PKG/usr/man -type f -exec gzip -9 {} \+
+for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
+
+# Add some documentation:
+mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
+cp -a *.md COPYRIGHT* COPYING* LICENSE* $PKG/usr/doc/$PKGNAM-$VERSION
+# Include licenses from third party vendors:
+mkdir $PKG/usr/doc/$PKGNAM-$VERSION/vendor
+( cd vendor
+  tar cf - $(find . -maxdepth 2 | grep -e README -e LICENSE -e COPYING -e CHANGELOG -e PERFORMANCE -e UPGRADE ) | ( cd $PKG/usr/doc/$PKGNAM-$VERSION/vendor ; tar xf - )
+)
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PKGNAM-$VERSION-$ARCH-$BUILD.txz