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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2.8 KiB
SPDX-License-Identifier: GPL-2.0
Makefile for the Linux aic7xxx SCSI driver.
Id: //depot/linux-aic79xx-2.5.0/drivers/scsi/aic7xxx/Makefile#8
Let kbuild descend into aicasm when cleaning
subdir- += aicasm
obj-$(CONFIG_SCSI_AIC7XXX) += aic7xxx.o obj-$(CONFIG_SCSI_AIC79XX) += aic79xx.o
Core Fast -> U160 files
aic7xxx-y += aic7xxx_core.o
aic7xxx_93cx6.o
aic7xxx-$(CONFIG_EISA) += aic7770.o
aic7xxx-$(CONFIG_PCI) += aic7xxx_pci.o
aic7xxx-$(CONFIG_AIC7XXX_REG_PRETTY_PRINT) += aic7xxx_reg_print.o
Platform Specific Fast -> U160 Files
aic7xxx-y += aic7xxx_osm.o
aic7xxx_proc.o
aic7xxx-$(CONFIG_EISA) += aic7770_osm.o
aic7xxx-$(CONFIG_PCI) += aic7xxx_osm_pci.o
Core U320 files
aic79xx-y += aic79xx_core.o
aic79xx_pci.o
aic79xx-$(CONFIG_AIC79XX_REG_PRETTY_PRINT) += aic79xx_reg_print.o
Platform Specific U320 Files
aic79xx-y += aic79xx_osm.o
aic79xx_proc.o
aic79xx_osm_pci.o
ifdef WARNINGS_BECOME_ERRORS ccflags-y += -Werror endif
Files generated that shall be removed upon make clean
clean-files := aic7xxx_seq.h aic7xxx_reg.h aic7xxx_reg_print.c clean-files += aic79xx_seq.h aic79xx_reg.h aic79xx_reg_print.c
Dependencies for generated files need to be listed explicitly
$(addprefix $(obj)/,$(aic7xxx-y)): $(obj)/aic7xxx_seq.h $(obj)/aic7xxx_reg.h $(addprefix $(obj)/,$(aic79xx-y)): $(obj)/aic79xx_seq.h $(obj)/aic79xx_reg.h
aic7xxx-gen-$(CONFIG_AIC7XXX_BUILD_FIRMWARE) := $(obj)/aic7xxx_reg.h aic7xxx-gen-$(CONFIG_AIC7XXX_REG_PRETTY_PRINT) += $(obj)/aic7xxx_reg_print.c
aicasm-7xxx-opts-$(CONFIG_AIC7XXX_REG_PRETTY_PRINT) :=
-p $(obj)/aic7xxx_reg_print.c -i aic7xxx_osm.h
ifeq ($(CONFIG_AIC7XXX_BUILD_FIRMWARE),y)
$(obj)/aic7xxx_seq.h: $(src)/aic7xxx.seq $(src)/aic7xxx.reg $(obj)/aicasm/aicasm
$(obj)/aicasm/aicasm -I $(src) -r $(obj)/aic7xxx_reg.h
$(aicasm-7xxx-opts-y) -o $(obj)/aic7xxx_seq.h
$(src)/aic7xxx.seq
$(aic7xxx-gen-y): $(objtree)/$(obj)/aic7xxx_seq.h @true else $(obj)/aic7xxx_reg_print.c: $(src)/aic7xxx_reg_print.c_shipped endif
aic79xx-gen-$(CONFIG_AIC79XX_BUILD_FIRMWARE) := $(obj)/aic79xx_reg.h aic79xx-gen-$(CONFIG_AIC79XX_REG_PRETTY_PRINT) += $(obj)/aic79xx_reg_print.c
aicasm-79xx-opts-$(CONFIG_AIC79XX_REG_PRETTY_PRINT) :=
-p $(obj)/aic79xx_reg_print.c -i aic79xx_osm.h
ifeq ($(CONFIG_AIC79XX_BUILD_FIRMWARE),y)
$(obj)/aic79xx_seq.h: $(src)/aic79xx.seq $(src)/aic79xx.reg $(obj)/aicasm/aicasm
$(obj)/aicasm/aicasm -I $(src) -r $(obj)/aic79xx_reg.h
$(aicasm-79xx-opts-y) -o $(obj)/aic79xx_seq.h
$(src)/aic79xx.seq
$(aic79xx-gen-y): $(objtree)/$(obj)/aic79xx_seq.h @true else $(obj)/aic79xx_reg_print.c: $(src)/aic79xx_reg_print.c_shipped endif
$(obj)/aicasm/aicasm: $(src)/aicasm/*.[chyl] $(MAKE) -C $(src)/aicasm OUTDIR=$(shell pwd)/$(obj)/aicasm/