1 files changed, 74 insertions, 0 deletions
diff --git a/profiles/features/llvm/make.defaults b/profiles/features/llvm/make.defaults
new file mode 100644
index 000000000000..77b32d47a3c2
--- /dev/null
+++ b/profiles/features/llvm/make.defaults
@@ -0,0 +1,74 @@
+# 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"