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Re: [Qemu-devel] [PATCH v2 1/2] make: fix where dependency *.d are store
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v2 1/2] make: fix where dependency *.d are stored. |
Date: |
Thu, 6 Aug 2015 12:02:22 +0300 |
On Thu, Aug 06, 2015 at 09:57:03AM +0100, Alex Bennée wrote:
>
> Victor Kaplansky <address@hidden> writes:
>
> > In rules like "bar/%.o: %.c" there is a difference between $(*D) and
> > $(@D). It is cleaner to generate *.d next to appropriate *.o, because it
> > allows precise including of dependency info from .d files.
>
> It might be worth putting the example in the comment as most people are
> not familiar with the esoteric symbolic of GNU Make. AIUI in your
> example $(@D) resolves to "bar" instead of "bar/%"
>
> >
> > As a hack, we also touch two sources for generated *.hex files. This is
> > to ensure *.hex rebuild, when old revision is switched to the new one.
>
> While I'm sure this was useful for testing do we really want to include
> such a hack in the git history?
This is the hint for why it's needed there:
"This is to ensure *.hex rebuild, when old revision is switched to the
new one."
Maybe add this, making this more explicit:
Without this hack, anyone doing "git pull; make" will not get *.hex
rebuilt
correctly since the dependency file would be missing.
> >
> > Signed-off-by: Victor Kaplansky <address@hidden>
> > ---
> > hw/i386/acpi-dsdt.dsl | 1 -
> > hw/i386/q35-acpi-dsdt.dsl | 1 +
> > rules.mak | 2 +-
> > 3 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/hw/i386/acpi-dsdt.dsl b/hw/i386/acpi-dsdt.dsl
> > index a2d84ec..8dba096 100644
> > --- a/hw/i386/acpi-dsdt.dsl
> > +++ b/hw/i386/acpi-dsdt.dsl
> > @@ -43,7 +43,6 @@ DefinitionBlock (
> >
> > #include "acpi-dsdt-hpet.dsl"
> >
> > -
> > /****************************************************************
> > * PIIX4 PM
> > ****************************************************************/
> > diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
> > index 16eaca3..7be7b37 100644
> > --- a/hw/i386/q35-acpi-dsdt.dsl
> > +++ b/hw/i386/q35-acpi-dsdt.dsl
> > @@ -22,6 +22,7 @@
> > * Based on acpi-dsdt.dsl, but heavily modified for q35 chipset.
> > */
> >
> > +
> > ACPI_EXTRACT_ALL_CODE Q35AcpiDsdtAmlCode
> >
> > DefinitionBlock (
> > diff --git a/rules.mak b/rules.mak
> > index aec27f8..6e35c36 100644
> > --- a/rules.mak
> > +++ b/rules.mak
> > @@ -17,7 +17,7 @@ MAKEFLAGS += -rR
> > QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes
> > -Wmissing-prototypes -Wnested-externs -Wold-style-declaration
> > -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))
> >
> > # Flags for dependency generation
> > -QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(*D)/$(*F).d
> > +QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
> >
> > # Same as -I$(SRC_PATH) -I., but for the nested source/object directories
> > QEMU_INCLUDES += -I$(<D) -I$(@D)
>
> --
> Alex Bennée