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 $(src). Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
15 lines
396 B
Makefile
15 lines
396 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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obj-$(CONFIG_FPE_NWFPE) += nwfpe/
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# Put arch/arm/fastfpe/ to use this.
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obj-$(CONFIG_FPE_FASTFPE) += $(patsubst $(src)/%,%,$(wildcard $(src)/fastfpe/))
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obj-$(CONFIG_VFP) += vfp/
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obj-$(CONFIG_XEN) += xen/
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obj-$(CONFIG_VDSO) += vdso/
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obj-y += kernel/ mm/ common/
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obj-y += probes/
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obj-y += net/
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obj-y += crypto/
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# for cleaning
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subdir- += boot
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