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#!/bin/bash
#
# llvm-target generator
#
# Author: Moritz Angermann <moritz.angermann@gmail.com>
#
# This file generates the `llvm-targets` file, which contains the
# data-layout, cpu and attributes for the target. This is done by
# querying `clang` for the data-layout, cpu and attributes based
# on a given target.
#
# To utilize it run it as
#
# $ ./gen-data-layout.sh > llvm-targets
#
# Add missing targets to the list below to have them included in
# llvm-targets file.
# Target sets
WINDOWS_x86="i386-unknown-windows i686-unknown-windows x86_64-unknown-windows"
LINUX_ARM="arm-unknown-linux-gnueabihf armv6-unknown-linux-gnueabihf armv7-unknown-linux-gnueabihf aarch64-unknown-linux-gnu aarch64-unknown-linux"
LINUX_x86="i386-unknown-linux-gnu i386-unknown-linux x86_64-unknown-linux-gnu x86_64-unknown-linux"
ANDROID="armv7-unknown-linux-androideabi aarch64-unknown-linux-android"
QNX="arm-unknown-nto-qnx-eabi"
MACOS="i386-apple-darwin x86_64-apple-darwin"
IOS="armv7-apple-ios arm64-apple-ios i386-apple-ios x86_64-apple-ios"
# targets for which to generate the llvm-targets file
TARGETS="${WINDOWS_x86} ${LINUX_ARM} ${LINUX_x86} ${ANDROID} ${QNX} ${MACOS} ${IOS}"
# given the call to clang -c11 that clang --target -v generates,
# parse the -target-cpu <CPU> and -target-feature <feature> from
# the output.
function get_cpu_and_attr() {
# echo $@
while [ "$#" -gt 0 ]; do
case "$1" in
-target-cpu) CPU=$2; shift 2;;
-target-feature) ATTR+=("$2"); shift 2;;
*) shift 1;;
esac
done
}
# first marker to discrimiate the first line being outputted.
FST=1
# a dummy file to use for the clang invocation.
FILE=_____dummy.c
touch $FILE
for target in $TARGETS; do
# find the cpu and attributes emitte by clang for the given $target
CPU=""
ATTR=()
args=$(clang --target=$target -S $FILE -o /dev/null -v 2>&1 |grep $FILE)
get_cpu_and_attr $args
# find the data-layout from the llvm code emitted by clang.
dl=$(clang --target=$target -S $FILE -emit-llvm -o -|grep datalayout |awk -F\ '{ print $4 }')
# GNU and Apple/LLVM can't agree on the aarch64 target.
# aarch64-apple-ios, is understood by autotools but not by LLVM.
# arm64-apple-ios, is understood by LLVM, but not by autotools.
#
# therefore, while we query clang with arm64-apple-ios, we put
# aarch64-apple-ios into the llvm-target list, as that is what
# we have to configure ghc with --target with anyway. Also we
# want to retain the GNU naming for compatibility with libraries
# that use autotools.
if [ "$target" == "arm64-apple-ios" ]; then
target="aarch64-apple-ios"
fi
if [ $FST -eq 1 ]; then
echo "[(\"${target}\", ($dl, \"$CPU\", \"${ATTR[*]}\"))"
FST=0
else
echo ",(\"${target}\", ($dl, \"$CPU\", \"${ATTR[*]}\"))"
fi
done
rm $FILE
echo "]"
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