rust: Move cargo config options into environment variables

This also:

* Modify the "release" profile in place of adding the "stripped" profile

  Only the profile for target is modified; there are no file size
  constraints for host.

* For host, build with the "release" profile

* For target, build with either the "dev" or "release" profile based on
  CONFIG_DEBUG

There is no environment variable to specify the "strip" option, but
enabling this option is not necessary as the build system will already
strip binaries based on CONFIG_NO_STRIP / CONFIG_USE_STRIP /
CONFIG_USE_SSTRIP.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/rust/Makefile

@@ -97,10 +97,6 @@ define Host/Install
 		done ; \
 		find . -mindepth 2 -maxdepth 2 -type f -name install.sh \
 			-execdir bash '{}' --prefix=$(STAGING_DIR)/host --disable-ldconfig \; ; \
-		\
-		sed -e 's|@RUSTC_TARGET_ARCH@|$(RUSTC_TARGET_ARCH)|g' \
-		    -e 's|@TARGET_CC_NOCACHE@|$(TARGET_CC_NOCACHE)|g' \
-			$(CURDIR)/files/cargo-config > $(CARGO_HOME)/config.toml ; \
 	)
 endef
 

lang/rust/files/cargo-config

@@ -1,7 +0,0 @@
-[target.@RUSTC_TARGET_ARCH@]
-linker = "@TARGET_CC_NOCACHE@"
-
-[profile.stripped]
-inherits = "release"
-opt-level = "s"
-strip = true

lang/rust/rust-host-build.mk

@@ -23,7 +23,7 @@ define Host/Compile/Cargo
 		CARGO_HOME=$(CARGO_HOME) \
 		CC=$(HOSTCC_NOCACHE) \
 		cargo install -v \
-			--profile stripped \
+			--profile $(CARGO_HOST_PROFILE) \
 			$(if $(RUST_HOST_FEATURES),--features "$(RUST_HOST_FEATURES)") \
 			--root $(HOST_INSTALL_DIR) \
 			--path "$(if $(strip $(1)),$(strip $(1)),.)" $(2) ; \

lang/rust/rust-package.mk

@@ -21,13 +21,15 @@ define Build/Compile/Cargo
 	( \
 		cd $(PKG_BUILD_DIR) ; \
 		CARGO_HOME=$(CARGO_HOME) \
+		CARGO_PROFILE_RELEASE_OPT_LEVEL=s \
+		CARGO_TARGET_$(subst -,_,$(call toupper,$(RUSTC_TARGET_ARCH)))_LINKER=$(TARGET_CC_NOCACHE) \
 		TARGET_CFLAGS="$(TARGET_CFLAGS) $(RUSTC_CFLAGS)" \
 		TARGET_CC=$(TARGET_CC_NOCACHE) \
 		CC=$(HOSTCC_NOCACHE) \
 		RUSTFLAGS="$(CARGO_RUSTFLAGS)" \
 		$(CARGO_VARS) \
 		cargo install -v \
-			--profile stripped \
+			--profile $(CARGO_PKG_PROFILE) \
 			--target $(RUSTC_TARGET_ARCH) \
 			$(if $(strip $(RUST_PKG_FEATURES)),--features "$(strip $(RUST_PKG_FEATURES))") \
 			--root $(PKG_INSTALL_DIR) \

lang/rust/rust-values.mk

@@ -62,3 +62,7 @@ endif
 
 # Support only a subset for now.
 RUST_ARCH_DEPENDS:=@(aarch64||arm||i386||i686||mips||mipsel||mips64||mips64el||mipsel||powerpc64||riscv64||x86_64)
+
+CARGO_HOST_PROFILE:=release
+
+CARGO_PKG_PROFILE:=$(if $(CONFIG_DEBUG),dev,release)