# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2023 Luca Barbato and Donald Hoskins

include $(TOPDIR)/rules.mk

PKG_NAME:=rust
PKG_VERSION:=1.75.0
PKG_RELEASE:=1

PKG_SOURCE:=rustc-$(PKG_VERSION)-src.tar.gz
PKG_SOURCE_URL:=https://static.rust-lang.org/dist/
PKG_HASH:=5b739f45bc9d341e2d1c570d65d2375591e22c2d23ef5b8a37711a0386abc088
HOST_BUILD_DIR:=$(BUILD_DIR)/host/rustc-$(PKG_VERSION)-src

PKG_MAINTAINER:=Luca Barbato <lu_zero@luminem.org>
PKG_LICENSE:=Apache-2.0 MIT
PKG_LICENSE_FILES:=LICENSE-APACHE LICENSE-MIT

PKG_HOST_ONLY:=1
PKG_BUILD_FLAGS:=no-mips16

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

define Package/rust
  SECTION:=lang
  CATEGORY:=Languages
  SUBMENU:=Rust
  TITLE:=Rust Programming Language Compiler
  URL:=https://www.rust-lang.org/
  DEPENDS:=$(RUST_ARCH_DEPENDS)
endef

define Package/rust/description
  Rust is a multi-paradigm, general-purpose programming language designed for performance
  and safety, especially safe concurrency. Rust is syntactically similar to C++, but can
  guarantee memory safety by using a borrow checker to validate references.
endef

define Package/rust/config
  source "$(SOURCE)/Config.in"
endef

# Rust-lang has an uninstall script
RUST_UNINSTALL:=$(STAGING_DIR)/host/lib/rustlib/uninstall.sh

# Target Flags
TARGET_CONFIGURE_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.$(RUSTC_TARGET_ARCH).ranlib=$(TARGET_RANLIB) \
	--set=target.$(RUSTC_TARGET_ARCH).crt-static=false \
	$(if $(CONFIG_USE_MUSL),--set=target.$(RUSTC_TARGET_ARCH).musl-root=$(TOOLCHAIN_DIR))

# CARGO_HOME is an environmental
HOST_CONFIGURE_VARS += CARGO_HOME="$(CARGO_HOME)"

# Rust Configuration Arguments
HOST_CONFIGURE_ARGS = \
	--build=$(RUSTC_HOST_ARCH) \
	--target=$(RUSTC_TARGET_ARCH),$(RUSTC_HOST_ARCH) \
	--host=$(RUSTC_HOST_ARCH) \
	--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 \
	--dist-compression-formats=gz \
	--enable-missing-tools \
	--disable-sanitizers \
	--release-channel=stable \
	--enable-cargo-native-static \
	--set=llvm.download-ci-llvm=true \
	$(TARGET_CONFIGURE_ARGS)

define Host/Uninstall
	# Call the Uninstall script
	[ -f $(RUST_UNINSTALL) ] && \
		$(BASH) $(RUST_UNINSTALL) || echo No Uninstall
endef

define Host/Compile
	$(RUST_SCCACHE_VARS) \
	CARGO_HOME=$(CARGO_HOME) \
	TARGET_CFLAGS="$(TARGET_CFLAGS)" \
	OPENWRT_RUSTC_BOOTSTRAP_CACHE=$(DL_DIR)/rustc \
	$(PYTHON) $(HOST_BUILD_DIR)/x.py \
		--build-dir $(HOST_BUILD_DIR)/build \
		--config $(HOST_BUILD_DIR)/config.toml \
		dist build-manifest cargo llvm-tools rustc rust-std rust-src
endef

define Host/Install
	( \
		cd $(HOST_BUILD_DIR)/build/dist ; \
		for targz in *.tar.gz; do \
			$(STAGING_DIR_HOST)/bin/libdeflate-gzip -dc "$$$$targz" | tar -xf - ; \
		done ; \
		find . -mindepth 2 -maxdepth 2 -type f -name install.sh \
			-execdir bash '{}' --prefix=$(STAGING_DIR)/host --disable-ldconfig \; ; \
	)
endef

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