rust: Consolidate cargo environment variables

This consolidates all environment variables for cargo into:

* CARGO_HOST_CONFIG_VARS / CARGO_PKG_CONFIG_VARS

  These contain all cargo-specific environment variables, i.e. without
  "common" variables like CC.

* CARGO_HOST_VARS / CARGO_PKG_VARS (renamed from CARGO_VARS)

  These contain all environment variables to be passed to cargo.

This also:

* Set the CARGO_BUILD_TARGET environment variable instead of using the
  --target command-line option

* Update Python include files to use CARGO_HOST_CONFIG_VARS /
  CARGO_PKG_CONFIG_VARS

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

6 files changed, 27 insertions, 20 deletions

diff --git a/lang/python/python3-host.mk b/lang/python/python3-host.mk
index 6ca002587c..b233c56799 100644
--- a/lang/python/python3-host.mk
+++ b/lang/python/python3-host.mk
@@ -78,7 +78,7 @@ HOST_PYTHON3_VARS = \
 	CFLAGS="$(HOST_CFLAGS)" \
 	CPPFLAGS="$(HOST_CPPFLAGS) -I$(HOST_PYTHON3_INC_DIR)" \
 	LDFLAGS="$(HOST_LDFLAGS) -lpython$(PYTHON3_VERSION) -Wl$(comma)-rpath$(comma)$(STAGING_DIR_HOSTPKG)/lib" \
-	CARGO_HOME="$(CARGO_HOME)"
+	$(CARGO_HOST_CONFIG_VARS)
 
 # $(1) => directory of python script
 # $(2) => python script and its arguments
diff --git a/lang/python/python3-package.mk b/lang/python/python3-package.mk
index fcb1d06b3a..e4c7bd264c 100644
--- a/lang/python/python3-package.mk
+++ b/lang/python/python3-package.mk
@@ -45,10 +45,8 @@ PYTHON3_VARS = \
 	_python_sysroot="$(STAGING_DIR)" \
 	_python_prefix="/usr" \
 	_python_exec_prefix="/usr" \
-	CARGO_BUILD_TARGET="$(RUSTC_TARGET_ARCH)" \
-	CARGO_HOME="$(CARGO_HOME)" \
-	PYO3_CROSS_LIB_DIR="$(PYTHON3_LIB_DIR)" \
-	RUSTFLAGS="$(CARGO_RUSTFLAGS)"
+	$(CARGO_PKG_CONFIG_VARS) \
+	PYO3_CROSS_LIB_DIR="$(PYTHON3_LIB_DIR)"
 
 # $(1) => directory of python script
 # $(2) => python script and its arguments
diff --git a/lang/rust/rust-host-build.mk b/lang/rust/rust-host-build.mk
index a03df2493a..38ce963e0f 100644
--- a/lang/rust/rust-host-build.mk
+++ b/lang/rust/rust-host-build.mk
@@ -15,13 +15,16 @@ ifeq ($(origin RUST_INCLUDE_DIR),undefined)
 endif
 include $(RUST_INCLUDE_DIR)/rust-values.mk
 
+CARGO_HOST_VARS= \
+	$(CARGO_HOST_CONFIG_VARS) \
+	CC=$(HOSTCC_NOCACHE)
+
 # $(1) path to the package (optional)
 # $(2) additional arguments to cargo (optional)
 define Host/Compile/Cargo
 	( \
 		cd $(HOST_BUILD_DIR) ; \
-		CARGO_HOME=$(CARGO_HOME) \
-		CC=$(HOSTCC_NOCACHE) \
+		$(CARGO_HOST_VARS) \
 		cargo install -v \
 			--profile $(CARGO_HOST_PROFILE) \
 			$(if $(RUST_HOST_FEATURES),--features "$(RUST_HOST_FEATURES)") \
@@ -33,8 +36,7 @@ endef
 define Host/Uninstall/Cargo
 	( \
 		cd $(HOST_BUILD_DIR) ; \
-		CARGO_HOME=$(CARGO_HOME) \
-		CC=$(HOSTCC_NOCACHE) \
+		$(CARGO_HOST_VARS) \
 		cargo uninstall -v \
 			--root $(HOST_INSTALL_DIR) || true ; \
 	)
diff --git a/lang/rust/rust-package.mk b/lang/rust/rust-package.mk
index 713d37d5be..6deb859fb6 100644
--- a/lang/rust/rust-package.mk
+++ b/lang/rust/rust-package.mk
@@ -15,22 +15,18 @@ ifeq ($(origin RUST_INCLUDE_DIR),undefined)
 endif
 include $(RUST_INCLUDE_DIR)/rust-values.mk
 
+CARGO_PKG_VARS= \
+	$(CARGO_PKG_CONFIG_VARS) \
+	CC=$(HOSTCC_NOCACHE)
+
 # $(1) path to the package (optional)
 # $(2) additional arguments to cargo (optional)
 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_PKG_VARS) \
 		cargo install -v \
 			--profile $(CARGO_PKG_PROFILE) \
-			--target $(RUSTC_TARGET_ARCH) \
 			$(if $(strip $(RUST_PKG_FEATURES)),--features "$(strip $(RUST_PKG_FEATURES))") \
 			--root $(PKG_INSTALL_DIR) \
 			--path "$(if $(strip $(1)),$(strip $(1)),.)" \
diff --git a/lang/rust/rust-values.mk b/lang/rust/rust-values.mk
index a0fab6ae10..8f2017af6b 100644
--- a/lang/rust/rust-values.mk
+++ b/lang/rust/rust-values.mk
@@ -6,7 +6,6 @@
 RUSTC_HOST_SUFFIX:=$(word 4, $(subst -, ,$(GNU_HOST_NAME)))
 RUSTC_HOST_ARCH:=$(HOST_ARCH)-unknown-linux-$(RUSTC_HOST_SUFFIX)
 CARGO_HOME:=$(DL_DIR)/cargo
-CARGO_VARS?=
 
 ifeq ($(CONFIG_USE_MUSL),y)
   # Force linking of the SSP library for musl
@@ -63,6 +62,18 @@ 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_CONFIG_VARS= \
+	CARGO_HOME=$(CARGO_HOME)
+
 CARGO_HOST_PROFILE:=release
 
+CARGO_PKG_CONFIG_VARS= \
+	CARGO_BUILD_TARGET=$(RUSTC_TARGET_ARCH) \
+	CARGO_HOME=$(CARGO_HOME) \
+	CARGO_PROFILE_RELEASE_OPT_LEVEL=s \
+	CARGO_TARGET_$(subst -,_,$(call toupper,$(RUSTC_TARGET_ARCH)))_LINKER=$(TARGET_CC_NOCACHE) \
+	RUSTFLAGS="$(CARGO_RUSTFLAGS)" \
+	TARGET_CC=$(TARGET_CC_NOCACHE) \
+	TARGET_CFLAGS="$(TARGET_CFLAGS) $(RUSTC_CFLAGS)"
+
 CARGO_PKG_PROFILE:=$(if $(CONFIG_DEBUG),dev,release)
diff --git a/net/netavark/Makefile b/net/netavark/Makefile
index d6d976fc24..9d5c5f4054 100644
--- a/net/netavark/Makefile
+++ b/net/netavark/Makefile
@@ -36,7 +36,7 @@ define Package/netavark/conffiles
 /etc/config/netavark
 endef
 
-CARGO_VARS += \
+CARGO_PKG_VARS += \
 	PROTOC=$(STAGING_DIR_HOSTPKG)/bin/protoc
 
 define Package/netavark/install