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Date: Sun, 9 Aug 2015 12:39:59 +0300
From: Victor Kaplansky <victork@redhat.com>
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Subject: [Qemu-devel] [PATCH v3 2/2] make: load only required dependency
	files.
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To: qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>, Eduardo Habkost <ehabkost@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Stefan Weil <sw@weilnetz.de>, Paolo Bonzini <pbonzini@redhat.com>, =?us-ascii?B?PT9VVEYtOD9xP0FsZXg9MjA9MjBCZW5uPUMzPUE5ZT89?= <alex.bennee@linaro.org>, Richard Henderson <rth@twiddle.net>

The old rules.mak loads dependency .d files using include directive
with file glob pattern "*.d". This breaks the build when build tree has
remanent *.d files from another build.

This patch fixes this by
  - loading precise list of .d files made from *.o and *.mo.
  - specifying explicit list of required dependency info files for
     *.hex autogenerated sources.

Note that Makefile still includes some .d in rood directory by including
"*.d".

Signed-off-by: Victor Kaplansky <victork@redhat.com>
---
 hw/i386/Makefile.objs | 8 +++++++-
 rules.mak             | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
index bd4f147..ecdb400 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -7,8 +7,14 @@ obj-$(CONFIG_XEN) += ../xenpv/ xen/
 
 obj-y += kvmvapic.o
 obj-y += acpi-build.o
+
+gen-hex-y += hw/i386/acpi-dsdt.hex
+gen-hex-y += hw/i386/q35-acpi-dsdt.hex
+
 hw/i386/acpi-build.o: hw/i386/acpi-build.c \
-	hw/i386/acpi-dsdt.hex hw/i386/q35-acpi-dsdt.hex
+	$(gen-hex-y)
+
+-include $(gen-hex-y:.hex=.d)
 
 iasl-option=$(shell if test -z "`$(1) $(2) 2>&1 > /dev/null`" \
     ; then echo "$(2)"; else echo "$(3)"; fi ;)
diff --git a/rules.mak b/rules.mak
index 6e35c36..4551b9e 100644
--- a/rules.mak
+++ b/rules.mak
@@ -368,6 +368,6 @@ define unnest-vars
                 $(error $o added in $v but $o-objs is not set)))
         $(shell mkdir -p ./ $(sort $(dir $($v))))
         # Include all the .d files
-        $(eval -include $(addsuffix *.d, $(sort $(dir $($v)))))
+        $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
         $(eval $v := $(filter-out %/,$($v))))
 endef
-- 
--Victor