Re: [Qemu-devel] [PATCH v2 2/2] make: load only required dependency files.

[Paolo Bonzini <pbonzini@redhat.com>]

On 05/08/2015 19:29, Victor Kaplansky wrote:
> 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 | 2 ++
>  rules.mak             | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
> index bd4f147..311d364 100644
> --- a/hw/i386/Makefile.objs
> +++ b/hw/i386/Makefile.objs
> @@ -10,6 +10,8 @@ obj-y += acpi-build.o
>  hw/i386/acpi-build.o: hw/i386/acpi-build.c \
>  	hw/i386/acpi-dsdt.hex hw/i386/q35-acpi-dsdt.hex
>  
> +-include hw/i386/acpi-dsdt.d hw/i386/q35-acpi-dsdt.d
> +

Having to include the files manually is ugly though.

The failed builds are ugly too, but I'm not sure which is worse... :(
Failed builds happen rarely and there are other cases where you should
just "make distclean" your way out of a failure.  On the other hand,
more complicated makefiles have to be maintained always.

Paolo