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54b8ae66ae
Kbuild provides per-file compiler flag addition/removal:
CFLAGS_<basetarget>.o
CFLAGS_REMOVE_<basetarget>.o
AFLAGS_<basetarget>.o
AFLAGS_REMOVE_<basetarget>.o
CPPFLAGS_<basetarget>.lds
HOSTCFLAGS_<basetarget>.o
HOSTCXXFLAGS_<basetarget>.o
The <basetarget> is the filename of the target with its directory and
suffix stripped.
This syntax comes into a trouble when two files with the same basename
appear in one Makefile, for example:
obj-y += foo.o
obj-y += dir/foo.o
CFLAGS_foo.o := <some-flags>
Here, the <some-flags> applies to both foo.o and dir/foo.o
The real world problem is:
scripts/kconfig/util.c
scripts/kconfig/lxdialog/util.c
Both files are compiled into scripts/kconfig/mconf, but only the
latter should be given with the ncurses flags.
It is more sensible to use the relative path to the Makefile, like this:
obj-y += foo.o
CFLAGS_foo.o := <some-flags>
obj-y += dir/foo.o
CFLAGS_dir/foo.o := <other-flags>
At first, I attempted to replace $(basetarget) with $*. The $* variable
is replaced with the stem ('%') part in a pattern rule. This works with
most of cases, but does not for explicit rules.
For example, arch/ia64/lib/Makefile reuses rule_as_o_S in its own
explicit rules, so $* will be empty, resulting in ignoring the per-file
AFLAGS.
I introduced a new variable, target-stem, which can be used also from
explicit rules.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Marc Zyngier <maz@kernel.org>
44 lines
1.3 KiB
Makefile
44 lines
1.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for Kernel-based Virtual Machine module
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#
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plus_virt := $(call as-instr,.arch_extension virt,+virt)
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ifeq ($(plus_virt),+virt)
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plus_virt_def := -DREQUIRES_VIRT=1
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endif
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KVM := ../../../virt/kvm
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ccflags-y += -I $(srctree)/$(src) -I $(srctree)/virt/kvm/arm/vgic
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CFLAGS_$(KVM)/arm/arm.o := $(plus_virt_def)
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AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt)
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AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)
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kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o
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obj-$(CONFIG_KVM_ARM_HOST) += hyp/
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obj-y += kvm-arm.o init.o interrupts.o
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obj-y += handle_exit.o guest.o emulate.o reset.o
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obj-y += coproc.o coproc_a15.o coproc_a7.o vgic-v3-coproc.o
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obj-y += $(KVM)/arm/arm.o $(KVM)/arm/mmu.o $(KVM)/arm/mmio.o
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obj-y += $(KVM)/arm/psci.o $(KVM)/arm/perf.o
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obj-y += $(KVM)/arm/aarch32.o
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obj-y += $(KVM)/arm/vgic/vgic.o
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obj-y += $(KVM)/arm/vgic/vgic-init.o
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obj-y += $(KVM)/arm/vgic/vgic-irqfd.o
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obj-y += $(KVM)/arm/vgic/vgic-v2.o
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obj-y += $(KVM)/arm/vgic/vgic-v3.o
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obj-y += $(KVM)/arm/vgic/vgic-v4.o
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obj-y += $(KVM)/arm/vgic/vgic-mmio.o
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obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o
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obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o
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obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o
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obj-y += $(KVM)/arm/vgic/vgic-its.o
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obj-y += $(KVM)/arm/vgic/vgic-debug.o
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obj-y += $(KVM)/irqchip.o
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obj-y += $(KVM)/arm/arch_timer.o
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