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Re: [Xen-devel] [PATCH v3 13/19] acpi: Makefile should better tolerate interrupts

On 09/08/2016 10:15 AM, Jan Beulich wrote:
>>>> On 07.09.16 at 20:59, <boris.ostrovsky@xxxxxxxxxx> wrote:
>> Intermediate stages of building a target should be made with
>> temporary files that are copied to final target in the end.
>> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
>> ---
>> New in v3
> Ah, here we go.
>> --- a/tools/libacpi/Makefile
>> +++ b/tools/libacpi/Makefile
>> @@ -21,38 +21,45 @@ MK_DSDT = $(ACPI_BUILD_DIR)/mk_dsdt
>>  C_SRC = $(addprefix $(ACPI_BUILD_DIR)/, dsdt_anycpu.c dsdt_15cpu.c  
>> dsdt_anycpu_qemu_xen.c dsdt_pvh.c)
>>  H_SRC = $(addprefix $(ACPI_BUILD_DIR)/, ssdt_s3.h ssdt_s4.h ssdt_pm.h 
>> ssdt_tpm.h)
>> +ifeq ($(subst all,,$(MAKECMDGOALS)),)
>> +TDIR := $(shell mktemp -d --tmpdir=$(TMPDIR) tmp_XXXXXX)
>> +endif
> How is this (or really the rules using this directory) supposed to work
> when other than "all" gets built?

I realize it's a somewhat weak argument but only 'all' and 'clean'
targets are supposed to be used. In fact I was thinking about explicitly
making a check for targets.

>>  vpath iasl $(PATH)
>>  all: $(C_SRC) $(H_SRC)
>> +    rm -fr $(TDIR)
> And how is the temporary directory going to get cleaned up when
> interrupting make? I think you really should use a subdirectory
> underneath the build directory, which then can stay there until
> "make clean". And then you can also use mv instead of cp below,
> or even move-if-changed.

The reason I am doing this in /tmp and use tmp_XXXXX as template is
because I found that at least one old versions of iasl has a bug where
it can't process path that has a '.' in it. It drops anything after the
dot, presumably because it thinks it's file suffix.

This is true on fedora12 (2009), which is what we still use as build
environment. I know that fedora 18 doesn't have this problem but I don't
know at which point this got fixed. (Interestingly enough, I tried to
build from F12's sources for iasl and could not reproduce this. Now, i
built with new tools so perhaps the bug is not in iasl itself but in
something like yacc, which is used for the build).

I don't think we have any requirement on supported iasl version so I am
not sure we can ignore this error.


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