Add missing files for Rust

rust/Config.in

@@ -0,0 +1,15 @@
+menu "Configuration options (for developers)"
+
+config RUST_SCCACHE
+	bool "Use sccache"
+	help
+	  Shared compilation cache; see https://github.com/mozilla/sccache
+
+config RUST_SCCACHE_DIR
+	string "Set sccache directory" if RUST_SCCACHE
+	default ""
+	help
+	  Store sccache in this directory.
+	  If not set, uses './.sccache'
+
+endmenu

rust/files/cargo-config

@@ -1,8 +0,0 @@
-[target.@RUSTC_TARGET_ARCH@]
-linker = "@TARGET_CC_NOCACHE@"
-rustflags = ["-Ctarget-feature=-crt-static", "-Clink-args=@RUSTC_LDFLAGS@"]
-
-[profile.stripped]
-inherits = "release"
-opt-level = "s"
-strip = true

rust/rust-host-build.mk

@@ -2,36 +2,42 @@
 #
 # Copyright (C) 2023 Luca Barbato and Donald Hoskins
 
+# Variables (all optional) to be set in package Makefiles:
+#
+# RUST_HOST_FEATURES - list of options, default empty
+#
+#   Space or comma separated list of features to activate
+#
+#   e.g. RUST_HOST_FEATURES:=enable-foo,with-bar
+
 ifeq ($(origin RUST_INCLUDE_DIR),undefined)
   RUST_INCLUDE_DIR:=$(dir $(lastword $(MAKEFILE_LIST)))
 endif
 include $(RUST_INCLUDE_DIR)/rust-values.mk
 
+CARGO_HOST_VARS= \
+	$(CARGO_HOST_CONFIG_VARS) \
+	CC=$(HOSTCC_NOCACHE) \
+	MAKEFLAGS="$(HOST_JOBS)"
+
 # $(1) path to the package (optional)
 # $(2) additional arguments to cargo (optional)
 define Host/Compile/Cargo
-	( \
-		cd $(HOST_BUILD_DIR) ; \
-		export PATH="$(CARGO_HOME)/bin:$(PATH)" ; \
-		CARGO_HOME=$(CARGO_HOME) \
-		CC=$(HOSTCC_NOCACHE) \
-		cargo install -v \
-			--profile stripped \
-			$(if $(RUST_PKG_FEATURES),--features "$(RUST_PKG_FEATURES)") \
-			--root $(HOST_INSTALL_DIR) \
-			--path "$(if $(strip $(1)),$(strip $(1)),.)" $(2) ; \
-	)
+	+$(CARGO_HOST_VARS) \
+	cargo install -v \
+		--profile $(CARGO_HOST_PROFILE) \
+		$(if $(RUST_HOST_FEATURES),--features "$(RUST_HOST_FEATURES)") \
+		--root $(HOST_INSTALL_DIR) \
+		--path "$(HOST_BUILD_DIR)/$(if $(strip $(1)),$(strip $(1)))" \
+		$(if $(filter --jobserver%,$(HOST_JOBS)),,-j1) \
+		$(2)
 endef
 
 define Host/Uninstall/Cargo
-	( \
-		cd $(HOST_BUILD_DIR) ; \
-		export PATH="$(CARGO_HOME)/bin:$(PATH)" ; \
-		CARGO_HOME=$(CARGO_HOME) \
-		CC=$(HOSTCC_NOCACHE) \
-		cargo uninstall -v \
-			--root $(HOST_INSTALL_DIR) || true ; \
-	)
+	+$(CARGO_HOST_VARS) \
+	cargo uninstall -v \
+		--root $(HOST_INSTALL_DIR) \
+		|| true
 endef
 
 define RustBinHostBuild

rust/rust-package.mk

@@ -15,28 +15,22 @@ ifeq ($(origin RUST_INCLUDE_DIR),undefined)
 endif
 include $(RUST_INCLUDE_DIR)/rust-values.mk
 
-# Support only a subset for now.
-RUST_ARCH_DEPENDS:=@(aarch64||arm||i386||i686||mips||mipsel||mips64||mips64el||mipsel||powerpc64||riscv64||x86_64)
+CARGO_PKG_VARS= \
+	$(CARGO_PKG_CONFIG_VARS) \
+	CC=$(HOSTCC_NOCACHE) \
+	MAKEFLAGS="$(PKG_JOBS)"
 
 # $(1) path to the package (optional)
 # $(2) additional arguments to cargo (optional)
 define Build/Compile/Cargo
-	( \
-		cd $(PKG_BUILD_DIR) ; \
-		export PATH="$(CARGO_HOME)/bin:$(PATH)" ; \
-		CARGO_HOME=$(CARGO_HOME) \
-		TARGET_CFLAGS="$(TARGET_CFLAGS) $(RUST_CFLAGS)" \
-		TARGET_CC=$(TARGET_CC_NOCACHE) \
-		CC=$(HOSTCC_NOCACHE) \
-		$(CARGO_VARS) \
-		cargo install -v \
-			--profile stripped \
-			--target $(RUSTC_TARGET_ARCH) \
-			$(if $(strip $(RUST_PKG_FEATURES)),--features "$(strip $(RUST_PKG_FEATURES))") \
-			--root $(PKG_INSTALL_DIR) \
-			--path "$(if $(strip $(1)),$(strip $(1)),.)" \
-			$(2) ; \
-	)
+	+$(CARGO_PKG_VARS) \
+	cargo install -v \
+		--profile $(CARGO_PKG_PROFILE) \
+		$(if $(strip $(RUST_PKG_FEATURES)),--features "$(strip $(RUST_PKG_FEATURES))") \
+		--root $(PKG_INSTALL_DIR) \
+		--path "$(PKG_BUILD_DIR)/$(if $(strip $(1)),$(strip $(1)))" \
+		$(if $(filter --jobserver%,$(PKG_JOBS)),,-j1) \
+		$(2)
 endef
 
 define RustBinPackage