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b1992c3772
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)
When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.
This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.
To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.
Going forward, the variables used in Makefiles will have the following
meanings:
$(obj) - directory in the object tree
$(src) - directory in the source tree (changed by this commit)
$(objtree) - the top of the kernel object tree
$(srctree) - the top of the kernel source tree
Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
49 lines
1.5 KiB
Makefile
49 lines
1.5 KiB
Makefile
# List of files in the vdso, has to be asm only for now
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obj-vdso32 = note.o sigtramp.o restart_syscall.o
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# Build rules
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targets := $(obj-vdso32) vdso32.so
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obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
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ccflags-y := -shared -fno-common -fbuiltin -mno-fast-indirect-calls -O2 -mno-long-calls
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# -march=1.1 -mschedule=7100LC
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ccflags-y += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
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$(call ld-option, -Wl$(comma)--hash-style=sysv)
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asflags-y := -D__VDSO32__ -s
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KBUILD_AFLAGS += -DBUILD_VDSO
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KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
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VDSO_LIBGCC := $(shell $(CROSS32CC) -print-libgcc-file-name)
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obj-y += vdso32_wrapper.o
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extra-y += vdso32.lds
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CPPFLAGS_vdso32.lds += -P -C # -U$(ARCH)
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$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so FORCE
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# Force dependency (incbin is bad)
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# link rule for the .so file, .lds has to be first
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$(obj)/vdso32.so: $(obj)/vdso32.lds $(obj-vdso32) $(VDSO_LIBGCC) FORCE
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$(call if_changed,vdso32ld)
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# assembly rules for the .S files
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$(obj-vdso32): %.o: %.S FORCE
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$(call if_changed_dep,vdso32as)
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# actual build commands
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quiet_cmd_vdso32ld = VDSO32L $@
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cmd_vdso32ld = $(CROSS32CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@
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quiet_cmd_vdso32as = VDSO32A $@
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cmd_vdso32as = $(CROSS32CC) $(a_flags) -c -o $@ $<
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# Generate VDSO offsets using helper script
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gen-vdsosym := $(src)/gen_vdso_offsets.sh
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quiet_cmd_vdsosym = VDSOSYM $@
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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include/generated/vdso32-offsets.h: $(obj)/vdso32.so FORCE
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$(call if_changed,vdsosym)
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