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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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
36 lines
608 B
Makefile
36 lines
608 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only OR MIT
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# Copyright (c) 2023 Imagination Technologies Ltd.
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subdir-ccflags-y := -I$(src)
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powervr-y := \
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pvr_ccb.o \
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pvr_cccb.o \
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pvr_context.o \
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pvr_device.o \
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pvr_device_info.o \
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pvr_drv.o \
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pvr_free_list.o \
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pvr_fw.o \
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pvr_fw_meta.o \
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pvr_fw_mips.o \
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pvr_fw_startstop.o \
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pvr_fw_trace.o \
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pvr_gem.o \
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pvr_hwrt.o \
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pvr_job.o \
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pvr_mmu.o \
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pvr_params.o \
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pvr_power.o \
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pvr_queue.o \
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pvr_stream.o \
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pvr_stream_defs.o \
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pvr_sync.o \
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pvr_vm.o \
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pvr_vm_mips.o
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powervr-$(CONFIG_DEBUG_FS) += \
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pvr_debugfs.o
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obj-$(CONFIG_DRM_POWERVR) += powervr.o
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