Re: [Qemu-devel] [PATCH] make: automatically include dependencies in recursive subdir rules (v2)

["Andreas Färber" <afaerber@suse.de>]

Am 18.06.2012 02:01, schrieb Anthony Liguori:
> I think I understand enough of what's going on in these rules to ensure this is
> right.  But I could certainly use a second or third opinion...
> 
> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
> ---
> v1 -> v2
>  - Remove unnecessary includes (Andreas)
>  - Add a sub makefile for hw/kvm (Andreas)
> ---
>  Makefile              |    4 ++--
>  Makefile.dis          |    2 +-
>  Makefile.target       |    2 +-
>  Makefile.user         |    2 +-
>  hw/i386/Makefile.objs |    2 +-
>  hw/kvm/Makefile.objs  |    1 +
>  rules.mak             |    1 +
>  7 files changed, 8 insertions(+), 6 deletions(-)
>  create mode 100644 hw/kvm/Makefile.objs
> 
> diff --git a/Makefile b/Makefile
> index cce45fb..593bd9b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -405,5 +405,5 @@ tar:
>  Makefile: $(GENERATED_HEADERS)
>  
>  # Include automatically generated dependency files
> --include $(wildcard *.d audio/*.d slirp/*.d block/*.d net/*.d ui/*.d qapi/*.d)
> --include $(wildcard qga/*.d hw/*.d hw/usb/*.d qom/*.d)
> +# All subdir dependencies come automatically from our recursive subdir rules
> +-include $(wildcard *.d)
> diff --git a/Makefile.dis b/Makefile.dis
> index 3e1fcaf..09060f0 100644
> --- a/Makefile.dis
> +++ b/Makefile.dis
> @@ -20,4 +20,4 @@ clean:
>  	rm -f *.o *.d *.a *~
>  
>  # Include automatically generated dependency files
> --include $(wildcard *.d */*.d)
> +-include $(wildcard *.d)
> diff --git a/Makefile.target b/Makefile.target
> index 2907aad..550d889 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -216,4 +216,4 @@ GENERATED_HEADERS += config-target.h
>  Makefile: $(GENERATED_HEADERS)
>  
>  # Include automatically generated dependency files
> --include $(wildcard *.d */*.d)
> +-include $(wildcard *.d)
> diff --git a/Makefile.user b/Makefile.user
> index b717820..0ffefe8 100644
> --- a/Makefile.user
> +++ b/Makefile.user
> @@ -23,4 +23,4 @@ clean:
>  	done
>  
>  # Include automatically generated dependency files
> --include $(wildcard *.d */*.d)
> +-include $(wildcard *.d)
> diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
> index d43f1df..eb171b7 100644
> --- a/hw/i386/Makefile.objs
> +++ b/hw/i386/Makefile.objs
> @@ -7,7 +7,7 @@ obj-y += debugcon.o multiboot.o
>  obj-y += pc_piix.o
>  obj-y += pc_sysfw.o
>  obj-$(CONFIG_XEN) += xen_platform.o xen_apic.o
> -obj-$(CONFIG_KVM) += kvm/clock.o kvm/apic.o kvm/i8259.o kvm/ioapic.o kvm/i8254.o
> +obj-y += kvm/

This will work technically but I still feel this is wrong semantically.
The pre-Paolo and current way is picking specific files from the hw/kvm/
directory. Your change above implies that in hw/kvm/ only x86 files can
live, which I dislike. As suggested before, I would prefer if x86-only
files were moved to an x86-specific location - the place for that
existing since Paolo's refactoring would be hw/i386/. CC'ing Jan. That
would match Paolo's reply in the unicore32 thread on future file
placement. Alternatives would be hw/i386/kvm/ or hw/kvm/i386/; we're
talking about a handful of files only though, so I don't think they
require a new subdirectory.

Andreas

>  obj-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
>  
>  obj-y := $(addprefix ../,$(obj-y))
> diff --git a/hw/kvm/Makefile.objs b/hw/kvm/Makefile.objs
> new file mode 100644
> index 0000000..226497a
> --- /dev/null
> +++ b/hw/kvm/Makefile.objs
> @@ -0,0 +1 @@
> +obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o
> diff --git a/rules.mak b/rules.mak
> index 4bc5e52..60f3e96 100644
> --- a/rules.mak
> +++ b/rules.mak
> @@ -94,6 +94,7 @@ define unnest-dir
>  $(foreach var,$(nested-vars),$(call push-var,$(var),$1/))
>  $(eval obj := $(obj)/$1)
>  $(eval include $(SRC_PATH)/$1/Makefile.objs)
> +$(eval -include $(wildcard $1/*.d))
>  $(eval obj := $(patsubst %/$1,%,$(obj)))
>  $(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))
>  endef

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