# Copyright 2021-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# this is for now highly experimental -dilfridge

# use clang as the primary compiler
CC="clang"
CXX="clang++"

# libtool needs this
LD="ld.lld"

# linker flags
LDFLAGS="${LDFLAGS} -fuse-ld=lld -rtlib=compiler-rt -unwindlib=libunwind -Wl,--as-needed"

## hardening flags
#SOME_HARDENING_CFLAGS="-fPIC -fstack-protector-strong -D_FORTIFY_SOURCE=2"
#SOME_HARDENING_LDFLAGS="-Wl,-z,relro,-z,now -pie"
#
# we need to eventually do this the same way as in gcc, for now let's
# keep it to a minimum
SOME_HARDENING_CFLAGS="-D_FORTIFY_SOURCE=2"
SOME_HARDENING_LDFLAGS=""

# enable hardening by default, cf. gcc[pie,ssp]
CFLAGS="${CFLAGS} ${SOME_HARDENING_FLAGS}"
CXXFLAGS="${CXXFLAGS} ${SOME_HARDENING_FLAGS}"
LDFLAGS="${LDFLAGS} ${SOME_HARDENING_LDFLAGS}"

# use LLVM-provided binutils
AR="llvm-ar"
AS="clang -c"
CPP="clang-cpp"
NM="llvm-nm"
STRIP="llvm-strip"
RANLIB="llvm-ranlib"
OBJCOPY="llvm-objcopy"
STRINGS="llvm-strings"
OBJDUMP="llvm-objdump"
READELF="llvm-readelf"
ADDR2LINE="llvm-addr2line"

# Rust needs this to build some crates (like uutils)
# https://github.com/rust-lang/rust/blob/master/compiler/rustc_llvm/build.rs
LLVM_USE_LIBCXX=1
# https://github.com/rust-lang/cc-rs#c-support
# https://github.com/rust-lang/cc-rs/blob/main/src/lib.rs
CXXSTDLIB="c++"

# bootstrap USE for stage1

# curl needed by cmake
BOOTSTRAP_USE="${BOOTSTRAP_USE} ssl curl_ssl_openssl"

# Clang needs this
BOOTSTRAP_USE="${BOOTSTRAP_USE} python_single_target_python3_10"

# sys-devel/llvm
BOOTSTRAP_USE="${BOOTSTRAP_USE} -binutils-plugin"

# sys-devel/clang, sys-devel/clang-runtime, sys-libs/llvm-libunwind, sys-libs/libcxx, sys-libs/libcxxabi
BOOTSTRAP_USE="${BOOTSTRAP_USE} compiler-rt clang libunwind"

# sys-devel/clang
BOOTSTRAP_USE="${BOOTSTRAP_USE} default-compiler-rt default-lld default-libcxx llvm-libunwind"

# sys-devel/clang-runtime
BOOTSTRAP_USE="${BOOTSTRAP_USE} libcxx -sanitize"

# sys-libs/libcxxabi
BOOTSTRAP_USE="${BOOTSTRAP_USE} libcxxabi"

# llvm & clang: explicitly disable all extra targets, otherwise linking stage2 fails
BOOTSTRAP_USE="${BOOTSTRAP_USE} -llvm_targets_BPF -llvm_targets_AMDGPU -llvm_targets_NVPTX -llvm_targets_BPF"