kbuild: rust: move rust/target.json to scripts/

scripts/ is a better place to generate files used treewide.

With target.json moved to scripts/, you do not need to add target.json
to no-clean-files or MRPROPER_FILES.

'make clean' does not visit scripts/, but 'make mrproper' does.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Tested-by: Miguel Ojeda <ojeda@kernel.org>

Makefile

@@ -569,7 +569,7 @@ KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 		   -std=gnu11
 KBUILD_CPPFLAGS := -D__KERNEL__
 KBUILD_RUSTFLAGS := $(rust_common_flags) \
-		    --target=$(objtree)/rust/target.json \
+		    --target=$(objtree)/scripts/target.json \
 		    -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 		    -Cforce-unwind-tables=n -Ccodegen-units=1 \
 		    -Csymbol-mangling-version=v0 \
@@ -1606,7 +1606,7 @@ MRPROPER_FILES += include/config include/generated          \
 		  certs/x509.genkey \
 		  vmlinux-gdb.py \
 		  *.spec \
-		  rust/target.json rust/libmacros.so
+		  rust/libmacros.so
 
 # clean - Delete most, but leave enough to build external modules
 #

rust/.gitignore

 # SPDX-License-Identifier: GPL-2.0
 
-target.json
 bindings_generated.rs
 bindings_helpers_generated.rs
 exports_*_generated.h

rust/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
-always-$(CONFIG_RUST) += target.json
-no-clean-files += target.json
-
 obj-$(CONFIG_RUST) += core.o compiler_builtins.o
 always-$(CONFIG_RUST) += exports_core_generated.h
 
@@ -231,11 +228,6 @@ rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
 	$(call if_changed,rustc_test)
 	$(call if_changed,rustc_test_library)
 
-filechk_rust_target = $(objtree)/scripts/generate_rust_target < $<
-
-$(obj)/target.json: $(objtree)/include/config/auto.conf FORCE
-	$(call filechk,rust_target)
-
 ifdef CONFIG_CC_IS_CLANG
 bindgen_c_flags = $(c_flags)
 else
@@ -359,7 +351,7 @@ rust-analyzer:
 $(obj)/core.o: private skip_clippy = 1
 $(obj)/core.o: private skip_flags = -Dunreachable_pub
 $(obj)/core.o: private rustc_target_flags = $(core-cfgs)
-$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs $(obj)/target.json FORCE
+$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE
 	$(call if_changed_dep,rustc_library)
 
 $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'

scripts/.gitignore

@@ -8,4 +8,5 @@
 /recordmcount
 /sign-file
 /sorttable
+/target.json
 /unifdef

scripts/Makefile

@@ -10,8 +10,14 @@ hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT)		+= sorttable
 hostprogs-always-$(CONFIG_ASN1)				+= asn1_compiler
 hostprogs-always-$(CONFIG_MODULE_SIG_FORMAT)		+= sign-file
 hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE)	+= insert-sys-cert
-hostprogs-always-$(CONFIG_RUST)				+= generate_rust_target
+always-$(CONFIG_RUST)					+= target.json
 
+filechk_rust_target = $< < include/config/auto.conf
+
+$(obj)/target.json: scripts/generate_rust_target include/config/auto.conf FORCE
+	$(call filechk,rust_target)
+
+hostprogs += generate_rust_target
 generate_rust_target-rust := y
 
 HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include

scripts/remove-stale-files

@@ -27,3 +27,5 @@ rm -f arch/x86/purgatory/kexec-purgatory.c
 rm -f scripts/extract-cert
 
 rm -f scripts/kconfig/[gmnq]conf-cfg
+
+rm -f rust/target.json