Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kbuild: use $(obj)/ instead of $(src)/ for common pattern rules
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:
src := $(obj)
Before changing the semantics of $(src) in the next commit, this commit
replaces $(obj)/ with $(src)/ in pattern rules where the prerequisite
might be a generated file.
C, assembly, Rust, and DTS files are sometimes generated by tools, so
they could be either generated files or real sources. The $(obj)/ prefix
works for both cases with the help of VPATH.
As mentioned above, $(obj) and $(src) are the same at this point, hence
this commit has no functional change.
I did not modify scripts/Makefile.userprogs because there is no use
case where userspace C files are generated.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
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scripts/Makefile.build
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scripts/Makefile.build
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quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
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-
$(obj)/%.s: $(src)/%.c FORCE
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+
$(obj)/%.s: $(obj)/%.c FORCE
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$(call if_changed_dep,cc_s_c)
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quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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-
$(obj)/%.i: $(src)/%.c FORCE
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$(obj)/%.i: $(obj)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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genksyms = scripts/genksyms/genksyms \
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quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null
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-
$(obj)/%.symtypes : $(src)/%.c FORCE
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$(obj)/%.symtypes : $(obj)/%.c FORCE
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$(call cmd,cc_symtypes_c)
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# LLVM assembly
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
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-
$(obj)/%.ll: $(src)/%.c FORCE
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$(obj)/%.ll: $(obj)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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# C (.c) files
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endef
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# Built-in and composite module parts
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$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
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$(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE
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$(call if_changed_rule,cc_o_c)
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$(call cmd,force_checksrc)
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···
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$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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System.map $(OBJDUMP) > $@
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-
$(obj)/%.lst: $(src)/%.c FORCE
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$(obj)/%.lst: $(obj)/%.c FORCE
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$(call if_changed_dep,cc_lst_c)
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# Compile Rust sources (.rs)
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quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_o_rs = $(rust_common_cmd) --emit=obj=$@ $<
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-
$(obj)/%.o: $(src)/%.rs FORCE
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$(obj)/%.o: $(obj)/%.rs FORCE
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+$(call if_changed_dep,rustc_o_rs)
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quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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$(rust_common_cmd) -Zunpretty=expanded $< >$@; \
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command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@
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-
$(obj)/%.rsi: $(src)/%.rs FORCE
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$(obj)/%.rsi: $(obj)/%.rs FORCE
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+$(call if_changed_dep,rustc_rsi_rs)
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quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
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-
$(obj)/%.s: $(src)/%.rs FORCE
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$(obj)/%.s: $(obj)/%.rs FORCE
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+$(call if_changed_dep,rustc_s_rs)
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quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
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-
$(obj)/%.ll: $(src)/%.rs FORCE
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$(obj)/%.ll: $(obj)/%.rs FORCE
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+$(call if_changed_dep,rustc_ll_rs)
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# Compile assembler sources (.S)
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quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null
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-
$(obj)/%.symtypes : $(src)/%.S FORCE
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$(obj)/%.symtypes : $(obj)/%.S FORCE
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$(call cmd,cc_symtypes_S)
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quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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$(obj)/%.s: $(src)/%.S FORCE
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$(obj)/%.s: $(obj)/%.S FORCE
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$(call if_changed_dep,cpp_s_S)
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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endif
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$(obj)/%.o: $(src)/%.S FORCE
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$(obj)/%.o: $(obj)/%.S FORCE
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$(call if_changed_rule,as_o_S)
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targets += $(filter-out $(subdir-builtin), $(real-obj-y))
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scripts/Makefile.host
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scripts/Makefile.host
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quiet_cmd_host-csingle = HOSTCC $@
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cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
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$(host-csingle): $(obj)/%: $(src)/%.c FORCE
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$(host-csingle): $(obj)/%: $(obj)/%.c FORCE
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$(call if_changed_dep,host-csingle)
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# Link an executable based on list of .o files, all plain c
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# host-cobjs -> .o
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quiet_cmd_host-cobjs = HOSTCC $@
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cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<
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$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
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$(host-cobjs): $(obj)/%.o: $(obj)/%.c FORCE
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$(call if_changed_dep,host-cobjs)
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# Link an executable based on list of .o files, a mixture of .c and .cc
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scripts/Makefile.lib
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scripts/Makefile.lib