#!/usr/bin/env bash
# brintcc — the C compiler driver for wasm32-hwjs-linux.
#
# The front door. It resolves configuration (libexec/config.sh), decides which
# libc this line is for, and execs the implementation in libexec/. It is an
# exec, not a call: this toolchain compiles entire distributions, and a second
# process per translation unit is a cost paid a million times.
#
# LIBC SELECTION. Default musl; `-mlibc=glibc` or a target triple naming a gnu
# environment selects the glibc implementation. The selector is STRIPPED before
# the exec — clang has no -mlibc flag and refuses the line if it sees one.
# Autotools does not ask for a libc by flag; it looks for a program named after
# the target triple, which is what the wasm32-hwjs-linux-*-gcc symlinks beside
# this file are for. Invoked through one of those, the name decides the default.
set -euo pipefail
# readlink -f, not dirname alone: these front doors are meant to be symlinked
# into a prefix on PATH, and a symlink's dirname is the prefix, not this repo.
source "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")/../libexec/config.sh"

brintium_require llvm sysroot
brintium_select_libc "$@"

case "$BRINTIUM_LIBC" in
  glibc)
    # The glibc arm compiles against the kernel UAPI headers unconditionally
    # (-isystem, on every line), so an absent pointer is a refusal here rather
    # than an -isystem of a directory that does not exist and a header error
    # a thousand lines into a build.
    brintium_require kernel-headers
    exec "$BRINTIUM/libexec/brintcc-glibc" "${BRINTIUM_ARGV[@]}" ;;
  musl)
    exec "$BRINTIUM/libexec/brintcc-musl" "${BRINTIUM_ARGV[@]}" ;;
esac