termux-packages/scripts/build/setup/termux_setup_ghc.sh

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# Utility function to setup a GHC toolchain.
termux_setup_ghc() {
if [ "$TERMUX_ON_DEVICE_BUILD" = "false" ]; then
local TERMUX_GHC_VERSION=8.10.1
local TERMUX_GHC_TEMP_FOLDER="${TERMUX_COMMON_CACHEDIR}/ghc-${TERMUX_GHC_VERSION}"
local TERMUX_GHC_TAR="${TERMUX_GHC_TEMP_FOLDER}.tar.xz"
local TERMUX_GHC_RUNTIME_FOLDER
if [ "${TERMUX_PACKAGES_OFFLINE-false}" = "true" ]; then
TERMUX_GHC_RUNTIME_FOLDER="${TERMUX_SCRIPTDIR}/build-tools/ghc-${TERMUX_GHC_VERSION}-runtime"
else
TERMUX_GHC_RUNTIME_FOLDER="${TERMUX_COMMON_CACHEDIR}/ghc-${TERMUX_GHC_VERSION}-runtime"
fi
export PATH="$TERMUX_GHC_RUNTIME_FOLDER/bin:$PATH"
if [ -d "$TERMUX_GHC_RUNTIME_FOLDER" ]; then return; fi
termux_download "https://downloads.haskell.org/~ghc/${TERMUX_GHC_VERSION}/ghc-${TERMUX_GHC_VERSION}-x86_64-deb10-linux.tar.xz" \
"$TERMUX_GHC_TAR" \
c1e31d798b013699b3c0de4fda27fb4cda47f572df0e75e3bd598a3012060615
rm -Rf "$TERMUX_GHC_TEMP_FOLDER"
tar xf "$TERMUX_GHC_TAR" -C "$TERMUX_COMMON_CACHEDIR"
(set -e
unset CC CXX CFLAGS CXXFLAGS CPPFLAGS LDFLAGS AR AS CPP LD RANLIB READELF STRIP
cd "$TERMUX_GHC_TEMP_FOLDER"
./configure --prefix="$TERMUX_GHC_RUNTIME_FOLDER"
make install
)
rm -Rf "$TERMUX_GHC_TEMP_FOLDER"
else
if [[ "$(dpkg --version 2>/dev/null)" && "$(dpkg-query -W -f '${db:Status-Status}\n' ghc 2>/dev/null)" != "installed" ]] ||
[[ "$(pacman -V 2>/dev/null)" && ! "$(pacman -Q ghc 2>/dev/null)" ]]; then
echo "Package 'ghc' is not installed."
exit 1
fi
fi
}