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#!/bin/bash
# This script installs clang on the local machine. Note that we don't install
# clang on Linux since its compiler story is just so different. Each container
# has its own toolchain configured appropriately already.
set -euo pipefail
IFS=$'\n\t'
source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
if isMacOS; then
curl -f "${MIRRORS_BASE}/clang%2Bllvm-9.0.0-x86_64-darwin-apple.tar.xz" | tar xJf -
ciCommandSetEnv CC "$(pwd)/clang+llvm-9.0.0-x86_64-darwin-apple/bin/clang"
ciCommandSetEnv CXX "$(pwd)/clang+llvm-9.0.0-x86_64-darwin-apple/bin/clang++"
# macOS 10.15 onwards doesn't have libraries in /usr/include anymore: those
# are now located deep into the filesystem, under Xcode's own files. The
# native clang is configured to use the correct path, but our custom one
# doesn't. This sets the SDKROOT environment variable to the SDK so that
# our own clang can figure out the correct include path on its own.
ciCommandSetEnv SDKROOT "$(xcrun --sdk macosx --show-sdk-path)"
# Configure `AR` specifically so rustbuild doesn't try to infer it as
# `clang-ar` by accident.
ciCommandSetEnv AR "ar"
elif isWindows && [[ ${CUSTOM_MINGW-0} -ne 1 ]]; then
# If we're compiling for MSVC then we, like most other distribution builders,
# switch to clang as the compiler. This'll allow us eventually to enable LTO
# amongst LLVM and rustc. Note that we only do this on MSVC as I don't think
# clang has an output mode compatible with MinGW that we need. If it does we
# should switch to clang for MinGW as well!
#
# Note that the LLVM installer is an NSIS installer
#
# Original downloaded here came from
# http://releases.llvm.org/9.0.0/LLVM-9.0.0-win64.exe
# That installer was run through `wine ./installer.exe /S /NCRC` on Linux
# and then the resulting installation directory (found in
# `$HOME/.wine/drive_c/Program Files/LLVM`) was packaged up into a tarball.
# We've had issues otherwise that the installer will randomly hang, provide
# not a lot of useful information, pollute global state, etc. In general the
# tarball is just more confined and easier to deal with when working with
# various CI environments.
mkdir -p citools
cd citools
curl -f "${MIRRORS_BASE}/LLVM-9.0.0-win64.tar.gz" | tar xzf -
ciCommandSetEnv RUST_CONFIGURE_ARGS \
"${RUST_CONFIGURE_ARGS} --set llvm.clang-cl=$(pwd)/clang-rust/bin/clang-cl.exe"
fi
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