# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
include $(TOPDIR)/rules.mk

PKG_NAME:=rust

PKG_VERSION:=1.62.1
PKG_RELEASE:=1

PKG_LICENSE:=Apache-2.0 MIT
PKG_LICENSE_FILES:=LICENSE-APACHE LICENSE-MIT

PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=https://github.com/rust-lang/rust.git
PKG_SOURCE_DATE:=2022-06-29
PKG_SOURCE_VERSION:=a8314ef7d0ec7b75c336af2c9857bfaf43002bfc
PKG_MIRROR_HASH:=09f933ee7a449751bc6d7ad6364dd44163439f029061daf158d7bfaf3a726184

HOST_BUILD_PARALLEL:=1
HOST_USE_NINJA:=1
PKG_HOST_ONLY:=1
HOST_BUILD_DIR:=$(BUILD_DIR_HOST)/rust-$(PKG_VERSION)

include $(INCLUDE_DIR)/package.mk
include $(INCLUDE_DIR)/host-build.mk
include ./rustc_environment.mk

HOST_STAMP_PREPARED=$(HOST_BUILD_DIR)/.prepared_$(RUSTC_TARGET_ARCH)
HOST_STAMP_BUILT=$(HOST_BUILD_DIR)/.built_$(RUSTC_TARGET_ARCH)
HOST_STAMP_CONFIGURED=$(HOST_BUILD_DIR)/.configured_$(RUSTC_TARGET_ARCH)
HOST_STAMP_INSTALLED=$(CARGO_HOME)/.rust_$(RUSTC_TARGET_ARCH)_installed

# Requires Python3 to build
HOST_BUILD_DEPENDS:=python3/host rust_host/host

# Use External rust-lang specific LLVM
RUST_UNINSTALL:=$(STAGING_DIR_HOST)/lib/rustlib/uninstall.sh
RUST_TMP_DIR:=$(TMP_DIR)/rust-install

# Set Configure Environmentals
HOST_CONFIGURE_OPTS += CARGO_HOME="$(CARGO_HOME)"

# The Flags are Common between HOST and TARGET
RUST_COMMON_ARGS := \
  --build=$(RUSTC_HOST_ARCH) \
  --host=$(RUSTC_HOST_ARCH) \
  --dist-compression-formats=xz \
  --enable-llvm-link-shared \
  --enable-llvm-plugins \
  --enable-missing-tools \
  --enable-ninja \
  --enable-optimize \
  --enable-optimize-llvm \
  --enable-parallel-compiler \
  --enable-sanitizers \
  --release-channel=nightly \
  --prefix=$(STAGING_DIR_HOST) \
  --bindir=$(STAGING_DIR_HOST)/bin \
  --libdir=$(STAGING_DIR_HOST)/lib \
  --sysconfdir=$(STAGING_DIR_HOST)/etc \
  --datadir=$(STAGING_DIR_HOST)/share \
  --mandir=$(STAGING_DIR_HOST)/man \
  --set=build.extended=true \
  --llvm-root=$(LLVM_DIR) \
  --set=target.$(RUSTC_TARGET_ARCH).llvm-config=$(LLVM_DIR)/bin/llvm-config

# MUSL Targets need additional flags
MUSL_ARGS = \
  --set=target.$(RUSTC_TARGET_ARCH).ar=$(TARGET_AR) \
  --set=target.$(RUSTC_TARGET_ARCH).cc=$(TARGET_CC_NOCACHE) \
  --set=target.$(RUSTC_TARGET_ARCH).cxx=$(TARGET_CXX_NOCACHE) \
  --set=target.$(RUSTC_TARGET_ARCH).linker=$(TARGET_CC_NOCACHE) \
  --set=target.$(RUSTC_TARGET_ARCH).musl-root=$(TOOLCHAIN_DIR) \
  --set=target.$(RUSTC_TARGET_ARCH).ranlib=$(TARGET_RANLIB)

##
# Because OpenWrt uses default configure flags that are not recognized
# we override the default and set our own.
#
# Rust HOST Configuration Arguments
HOST_CONFIGURE_ARGS = \
  --target=$(RUSTC_TARGET_ARCH) \
  ${RUST_COMMON_ARGS} \
  $(MUSL_ARGS) \
  --set=build.cargo=$(STAGING_DIR_HOST)/bin/cargo \
  --set=build.rustc=$(STAGING_DIR_HOST)/bin/rustc

HOST_CXXFLAGS += -DLLVM_RUSTLLVM

define Host/Uninstall
	rm -rf $(HOST_STAMP_INSTALLED)
endef

# Installation is done via Host/Compile
define Host/Install
endef

define Host/Compile
	@echo '========================='
	@echo '=   RUSTC_TARGET_ARCH   ='
	@echo '========================='
	@echo '$(RUSTC_TARGET_ARCH)'
	@echo '========================='
	$(if $(RUSTC_TARGET_ARCH),,$(error RUSTC_TARGET_ARCH is not set. Did you change the package feed name?))
	cd $(HOST_BUILD_DIR) && \
	  CARGO_HOME='$(CARGO_HOME)' \
	  CXXFLAGS='$(HOST_CXXFLAGS)' \
	  LD_LIBRARY_PATH=$(LLVM_DIR)/lib:$(STAGING_DIR_HOST)/lib \
	  $(PYTHON) x.py install --config ./config.toml --stage 1 library/std
endef

define Package/rust
  TITLE:=Rust programming language
  CATEGORY:=Languages
  SECTION:=lang
  DEPENDS:=
endef

define Package/rust/description
  Rust Programming Language
endef

define Package/rust/install
	true
endef

$(eval $(call HostBuild))
$(eval $(call BuildPackage,rust))