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#!/usr/bin/env bash
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# This script guesses the llvm target triple for the host machine.
#
# We're doing this in a shell script so it can be distributed with megazords
# to be deployed without a Rust compiler.
#
# With a rustc compiler present, we could determine definitively:
#
#
# This method is available by passing the --use-rustc argument.
#
# Otherwise, we want to be able to pick a binary from several already built. If we leave it
# to rustc, we may get the `linux-gnu` build instead of the `linux-musl` build.
#
# In this case, we use uname and some well placed `case` statements.
#
# If an argument is supplied, then it is treated as a library name, and a path to a shared object for that library
# is given. For example:
#
# % detect-target.sh foo-bar
# aarch64-apple-darwin/libfoo_bar.dylib
#
set -euo pipefail
detect_arch() {
ARCH=$(uname -m)
case $ARCH in
aarch64) ARCH="aarch64" ;;
arm64) ARCH="aarch64" ;;
x86_64) ARCH="x86_64" ;;
amd64) ARCH="x86_64" ;;
esac
}
# initOS discovers the operating system for this system.
detect_os() {
OS=$(uname|tr '[:upper:]' '[:lower:]')
case "$OS" in
# Minimalist GNU for Windows
mingw*|cygwin*) OS='windows' ;;
darwin*) OS='darwin' ;;
linux*) OS='linux' ;;
esac
}
detect_target() {
local RUSTC
local SED
RUSTC=$(which rustc)
SED=$(which sed)
if [ -n "$RUSTC" ] && [ -n "$SED" ] ; then
TARGET=$(rustc --version --verbose | sed -n 's|host: ||p' )
fi
}
guess_target() {
local DOUBLE=""
case "$OS" in
"darwin") DOUBLE="apple-darwin" ;;
"linux") DOUBLE="unknown-linux-gnu" ;;
"windows") DOUBLE="pc-windows-gnu" ;;
esac
TARGET="$ARCH-$DOUBLE"
}
guess_filename() {
local lib="${1/-/_}"
case "$OS" in
"darwin") FILENAME="lib${lib}.dylib" ;;
"linux") FILENAME="lib${lib}.so" ;;
"windows") FILENAME="${lib}.dll" ;;
esac
}
LIB_NAME=${1:-}
detect_arch
detect_os
TARGET=""
if [ "$LIB_NAME" == "--use-rustc" ] ; then
shift
LIB_NAME=${1:-}
detect_target
fi
if [ -z "$TARGET" ] ; then
guess_target
fi
if [ -n "$LIB_NAME" ]; then
guess_filename "$LIB_NAME"
echo -n "$TARGET/$FILENAME"
else
echo -n "$TARGET"
fi