Re: [Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Dr. David Alan Gilbert]

* Wei Huang (w...@redhat.com) wrote:
> 
> 
> On 02/27/2018 05:38 AM, Dr. David Alan Gilbert wrote:
> > * Wei Huang (w...@redhat.com) wrote:
> >>
> >>
> >> On 02/26/2018 12:01 PM, Dr. David Alan Gilbert wrote:
> >>> * Wei Huang (w...@redhat.com) wrote:
>  The x86 boot block header currently is generated with a shell script.
>  To better support other CPUs (e.g. aarch64), we convert the script
>  into Makefile. This allows us to 1) support cross-compilation easily,
>  and 2) avoid creating a script file for every architecture.
> 
>  Signed-off-by: Wei Huang 
> >>>
> >>> But what happens if you're on a system that doesn't have the cross
> >>> compilers?  I found it's too easy to get stuck with it trying
> >>> to rebuild the header when there's no need.
> >>
> >> I think it is fine. If no cross compiler is present, NNN_cross_prefix
> >> won't find anything. So it ends up with using the gcc tools on host
> >> systems. Obviously the compilation will fail. This should become the
> >> problem to solve for whoever wants to do cross-compile. For us, we have
> >> done our part because the .h files have been provided.
> > 
> > But isn't it a problem for people just trying to make check?
> 
> "make check" doesn't invoke the Makefile in tests/migration/. This
> Makefile is only invoked when people manually run "make" or "make
> x86-a-b-bootblock.h" inside the tests/migration/ directory.

Ah! That's what I hadn't spotted; I'd not noticed you'd created a
separate non-included Makefile.

In that case, yes:


Reviewed-by: Dr. David Alan Gilbert 

> > One of the things that convinced me to move it out of the makefile and
> > into a separate script was that it was too easy to get into a situation
> > where Make wanted to rebuild the headerilfe on a system.
> 
> This could be potentially one concern. But the real reason behind this
> concern is the cross-compilation doesn't always work (it depends on the
> availability of cross-compiler tools). My argument is this problem also
> exists in the original script approach. As long as QEMU doesn't include
> tests/migration/Makefile in "make" or "make check", I think this rebuild
> headerfile situation won't happen.

Yes.

> Also, using Makefile, we don't need to write a script for each single
> architecture. And it is easier to support cross-compilation detection
> (than script).

That doesn't make too much difference to me; but as long as it's a
separate Makefile that's OK.

Dave

> Thanks,
> -Wei
> 
> > 
> > Dave
> > 
> >>>
> >>> Dave
> >>>
>  ---
>   tests/migration/Makefile | 36 
>  
>   tests/migration/rebuild-x86-bootblock.sh | 33 
>  -
>   tests/migration/x86-a-b-bootblock.h  |  2 +-
>   tests/migration/x86-a-b-bootblock.s  |  5 ++---
>   4 files changed, 39 insertions(+), 37 deletions(-)
>   create mode 100644 tests/migration/Makefile
>   delete mode 100755 tests/migration/rebuild-x86-bootblock.sh
> 
>  diff --git a/tests/migration/Makefile b/tests/migration/Makefile
>  new file mode 100644
>  index 00..8fbedaa8b8
>  --- /dev/null
>  +++ b/tests/migration/Makefile
>  @@ -0,0 +1,36 @@
>  +#
>  +# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
>  +#
>  +# Authors:
>  +#   Dave Gilbert 
>  +#
>  +# This work is licensed under the terms of the GNU GPL, version 2 or 
>  later.
>  +# See the COPYING file in the top-level directory.
>  +#
>  +export __note
>  +override define __note
>  +/* This file is automatically generated from
>  + * tests/migration/$<, edit that and then run
>  + * "make $@" inside tests/migration to update,
>  + * and then remember to send both in your patch submission.
>  + */
>  +endef
>  +
>  +all: x86-a-b-bootblock.h
>  +# Dummy command so that make thinks it has done something
>  +@true
>  +
>  +SRC_PATH=../..
>  +include $(SRC_PATH)/rules.mak
>  +
>  +x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
>  +
>  +x86-a-b-bootblock.h: x86-a-b-bootblock.s
>  +$(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
>  +$(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
>  +dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
>  +echo "$$__note" > $@
>  +xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
>  +
>  +clean:
>  +rm -f *.bootsect *.boot *.o
>  diff --git a/tests/migration/rebuild-x86-bootblock.sh 
>  b/tests/migration/rebuild-x86-bootblock.sh
>  deleted file mode 100755
>  index 86cec5d284..00
>  --- a/tests/migration/rebuild-x86-bootblock.sh
>  +++ /dev/null
>  @@ -1,33 +0,0 @@
>  -#!/bin/sh
>  -# Copyright (c) 2016-2018 Red Hat, Inc. and/or its 

Re: [Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Wei Huang]

On 02/27/2018 05:38 AM, Dr. David Alan Gilbert wrote:
> * Wei Huang (w...@redhat.com) wrote:
>>
>>
>> On 02/26/2018 12:01 PM, Dr. David Alan Gilbert wrote:
>>> * Wei Huang (w...@redhat.com) wrote:
 The x86 boot block header currently is generated with a shell script.
 To better support other CPUs (e.g. aarch64), we convert the script
 into Makefile. This allows us to 1) support cross-compilation easily,
 and 2) avoid creating a script file for every architecture.

 Signed-off-by: Wei Huang 
>>>
>>> But what happens if you're on a system that doesn't have the cross
>>> compilers?  I found it's too easy to get stuck with it trying
>>> to rebuild the header when there's no need.
>>
>> I think it is fine. If no cross compiler is present, NNN_cross_prefix
>> won't find anything. So it ends up with using the gcc tools on host
>> systems. Obviously the compilation will fail. This should become the
>> problem to solve for whoever wants to do cross-compile. For us, we have
>> done our part because the .h files have been provided.
> 
> But isn't it a problem for people just trying to make check?

"make check" doesn't invoke the Makefile in tests/migration/. This
Makefile is only invoked when people manually run "make" or "make
x86-a-b-bootblock.h" inside the tests/migration/ directory.

> One of the things that convinced me to move it out of the makefile and
> into a separate script was that it was too easy to get into a situation
> where Make wanted to rebuild the headerilfe on a system.

This could be potentially one concern. But the real reason behind this
concern is the cross-compilation doesn't always work (it depends on the
availability of cross-compiler tools). My argument is this problem also
exists in the original script approach. As long as QEMU doesn't include
tests/migration/Makefile in "make" or "make check", I think this rebuild
headerfile situation won't happen.

Also, using Makefile, we don't need to write a script for each single
architecture. And it is easier to support cross-compilation detection
(than script).

Thanks,
-Wei

> 
> Dave
> 
>>>
>>> Dave
>>>
 ---
  tests/migration/Makefile | 36 
 
  tests/migration/rebuild-x86-bootblock.sh | 33 
 -
  tests/migration/x86-a-b-bootblock.h  |  2 +-
  tests/migration/x86-a-b-bootblock.s  |  5 ++---
  4 files changed, 39 insertions(+), 37 deletions(-)
  create mode 100644 tests/migration/Makefile
  delete mode 100755 tests/migration/rebuild-x86-bootblock.sh

 diff --git a/tests/migration/Makefile b/tests/migration/Makefile
 new file mode 100644
 index 00..8fbedaa8b8
 --- /dev/null
 +++ b/tests/migration/Makefile
 @@ -0,0 +1,36 @@
 +#
 +# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
 +#
 +# Authors:
 +#   Dave Gilbert 
 +#
 +# This work is licensed under the terms of the GNU GPL, version 2 or 
 later.
 +# See the COPYING file in the top-level directory.
 +#
 +export __note
 +override define __note
 +/* This file is automatically generated from
 + * tests/migration/$<, edit that and then run
 + * "make $@" inside tests/migration to update,
 + * and then remember to send both in your patch submission.
 + */
 +endef
 +
 +all: x86-a-b-bootblock.h
 +# Dummy command so that make thinks it has done something
 +  @true
 +
 +SRC_PATH=../..
 +include $(SRC_PATH)/rules.mak
 +
 +x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
 +
 +x86-a-b-bootblock.h: x86-a-b-bootblock.s
 +  $(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
 +  $(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
 +  dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
 +  echo "$$__note" > $@
 +  xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
 +
 +clean:
 +  rm -f *.bootsect *.boot *.o
 diff --git a/tests/migration/rebuild-x86-bootblock.sh 
 b/tests/migration/rebuild-x86-bootblock.sh
 deleted file mode 100755
 index 86cec5d284..00
 --- a/tests/migration/rebuild-x86-bootblock.sh
 +++ /dev/null
 @@ -1,33 +0,0 @@
 -#!/bin/sh
 -# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
 -# This work is licensed under the terms of the GNU GPL, version 2 or 
 later.
 -# See the COPYING file in the top-level directory.
 -#
 -# Author: dgilb...@redhat.com
 -
 -ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
 -HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
 -
 -if [ ! -e "$ASMFILE" ]
 -then
 -  echo "Couldn't find $ASMFILE" >&2
 -  exit 1
 -fi
 -
 -ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XX)
 -cd "$ASM_WORK_DIR" &&
 -as --32 -march=i486 "$ASMFILE" -o x86.o &&
 -objcopy -O binary x86.o 

Re: [Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Dr. David Alan Gilbert]

* Wei Huang (w...@redhat.com) wrote:
> 
> 
> On 02/26/2018 12:01 PM, Dr. David Alan Gilbert wrote:
> > * Wei Huang (w...@redhat.com) wrote:
> >> The x86 boot block header currently is generated with a shell script.
> >> To better support other CPUs (e.g. aarch64), we convert the script
> >> into Makefile. This allows us to 1) support cross-compilation easily,
> >> and 2) avoid creating a script file for every architecture.
> >>
> >> Signed-off-by: Wei Huang 
> > 
> > But what happens if you're on a system that doesn't have the cross
> > compilers?  I found it's too easy to get stuck with it trying
> > to rebuild the header when there's no need.
> 
> I think it is fine. If no cross compiler is present, NNN_cross_prefix
> won't find anything. So it ends up with using the gcc tools on host
> systems. Obviously the compilation will fail. This should become the
> problem to solve for whoever wants to do cross-compile. For us, we have
> done our part because the .h files have been provided.

But isn't it a problem for people just trying to make check?
One of the things that convinced me to move it out of the makefile and
into a separate script was that it was too easy to get into a situation
where Make wanted to rebuild the headerilfe on a system.

Dave

> > 
> > Dave
> > 
> >> ---
> >>  tests/migration/Makefile | 36 
> >> 
> >>  tests/migration/rebuild-x86-bootblock.sh | 33 
> >> -
> >>  tests/migration/x86-a-b-bootblock.h  |  2 +-
> >>  tests/migration/x86-a-b-bootblock.s  |  5 ++---
> >>  4 files changed, 39 insertions(+), 37 deletions(-)
> >>  create mode 100644 tests/migration/Makefile
> >>  delete mode 100755 tests/migration/rebuild-x86-bootblock.sh
> >>
> >> diff --git a/tests/migration/Makefile b/tests/migration/Makefile
> >> new file mode 100644
> >> index 00..8fbedaa8b8
> >> --- /dev/null
> >> +++ b/tests/migration/Makefile
> >> @@ -0,0 +1,36 @@
> >> +#
> >> +# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
> >> +#
> >> +# Authors:
> >> +#   Dave Gilbert 
> >> +#
> >> +# This work is licensed under the terms of the GNU GPL, version 2 or 
> >> later.
> >> +# See the COPYING file in the top-level directory.
> >> +#
> >> +export __note
> >> +override define __note
> >> +/* This file is automatically generated from
> >> + * tests/migration/$<, edit that and then run
> >> + * "make $@" inside tests/migration to update,
> >> + * and then remember to send both in your patch submission.
> >> + */
> >> +endef
> >> +
> >> +all: x86-a-b-bootblock.h
> >> +# Dummy command so that make thinks it has done something
> >> +  @true
> >> +
> >> +SRC_PATH=../..
> >> +include $(SRC_PATH)/rules.mak
> >> +
> >> +x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
> >> +
> >> +x86-a-b-bootblock.h: x86-a-b-bootblock.s
> >> +  $(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
> >> +  $(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
> >> +  dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
> >> +  echo "$$__note" > $@
> >> +  xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
> >> +
> >> +clean:
> >> +  rm -f *.bootsect *.boot *.o
> >> diff --git a/tests/migration/rebuild-x86-bootblock.sh 
> >> b/tests/migration/rebuild-x86-bootblock.sh
> >> deleted file mode 100755
> >> index 86cec5d284..00
> >> --- a/tests/migration/rebuild-x86-bootblock.sh
> >> +++ /dev/null
> >> @@ -1,33 +0,0 @@
> >> -#!/bin/sh
> >> -# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
> >> -# This work is licensed under the terms of the GNU GPL, version 2 or 
> >> later.
> >> -# See the COPYING file in the top-level directory.
> >> -#
> >> -# Author: dgilb...@redhat.com
> >> -
> >> -ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
> >> -HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
> >> -
> >> -if [ ! -e "$ASMFILE" ]
> >> -then
> >> -  echo "Couldn't find $ASMFILE" >&2
> >> -  exit 1
> >> -fi
> >> -
> >> -ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XX)
> >> -cd "$ASM_WORK_DIR" &&
> >> -as --32 -march=i486 "$ASMFILE" -o x86.o &&
> >> -objcopy -O binary x86.o x86.boot &&
> >> -dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124 &&
> >> -xxd -i x86.bootsect |
> >> -sed -e 's/.*int.*//' > x86.hex &&
> >> -cat - x86.hex < "$HEADER"
> >> -/* This file is automatically generated from
> >> - * tests/migration/x86-a-b-bootblock.s, edit that and then run
> >> - * tests/migration/rebuild-x86-bootblock.sh to update,
> >> - * and then remember to send both in your patch submission.
> >> - */
> >> -HERE
> >> -
> >> -rm x86.hex x86.bootsect x86.boot x86.o
> >> -cd .. && rmdir "$ASM_WORK_DIR"
> >> diff --git a/tests/migration/x86-a-b-bootblock.h 
> >> b/tests/migration/x86-a-b-bootblock.h
> >> index 78a151fe2a..9e8e2e028b 100644
> >> --- a/tests/migration/x86-a-b-bootblock.h
> >> +++ b/tests/migration/x86-a-b-bootblock.h
> >> @@ -1,6 +1,6 @@
> >>  /* This file is automatically generated from
> 

Re: [Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Wei Huang]

On 02/26/2018 12:01 PM, Dr. David Alan Gilbert wrote:
> * Wei Huang (w...@redhat.com) wrote:
>> The x86 boot block header currently is generated with a shell script.
>> To better support other CPUs (e.g. aarch64), we convert the script
>> into Makefile. This allows us to 1) support cross-compilation easily,
>> and 2) avoid creating a script file for every architecture.
>>
>> Signed-off-by: Wei Huang 
> 
> But what happens if you're on a system that doesn't have the cross
> compilers?  I found it's too easy to get stuck with it trying
> to rebuild the header when there's no need.

I think it is fine. If no cross compiler is present, NNN_cross_prefix
won't find anything. So it ends up with using the gcc tools on host
systems. Obviously the compilation will fail. This should become the
problem to solve for whoever wants to do cross-compile. For us, we have
done our part because the .h files have been provided.

> 
> Dave
> 
>> ---
>>  tests/migration/Makefile | 36 
>> 
>>  tests/migration/rebuild-x86-bootblock.sh | 33 -
>>  tests/migration/x86-a-b-bootblock.h  |  2 +-
>>  tests/migration/x86-a-b-bootblock.s  |  5 ++---
>>  4 files changed, 39 insertions(+), 37 deletions(-)
>>  create mode 100644 tests/migration/Makefile
>>  delete mode 100755 tests/migration/rebuild-x86-bootblock.sh
>>
>> diff --git a/tests/migration/Makefile b/tests/migration/Makefile
>> new file mode 100644
>> index 00..8fbedaa8b8
>> --- /dev/null
>> +++ b/tests/migration/Makefile
>> @@ -0,0 +1,36 @@
>> +#
>> +# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
>> +#
>> +# Authors:
>> +#   Dave Gilbert 
>> +#
>> +# This work is licensed under the terms of the GNU GPL, version 2 or later.
>> +# See the COPYING file in the top-level directory.
>> +#
>> +export __note
>> +override define __note
>> +/* This file is automatically generated from
>> + * tests/migration/$<, edit that and then run
>> + * "make $@" inside tests/migration to update,
>> + * and then remember to send both in your patch submission.
>> + */
>> +endef
>> +
>> +all: x86-a-b-bootblock.h
>> +# Dummy command so that make thinks it has done something
>> +@true
>> +
>> +SRC_PATH=../..
>> +include $(SRC_PATH)/rules.mak
>> +
>> +x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
>> +
>> +x86-a-b-bootblock.h: x86-a-b-bootblock.s
>> +$(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
>> +$(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
>> +dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
>> +echo "$$__note" > $@
>> +xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
>> +
>> +clean:
>> +rm -f *.bootsect *.boot *.o
>> diff --git a/tests/migration/rebuild-x86-bootblock.sh 
>> b/tests/migration/rebuild-x86-bootblock.sh
>> deleted file mode 100755
>> index 86cec5d284..00
>> --- a/tests/migration/rebuild-x86-bootblock.sh
>> +++ /dev/null
>> @@ -1,33 +0,0 @@
>> -#!/bin/sh
>> -# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
>> -# This work is licensed under the terms of the GNU GPL, version 2 or later.
>> -# See the COPYING file in the top-level directory.
>> -#
>> -# Author: dgilb...@redhat.com
>> -
>> -ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
>> -HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
>> -
>> -if [ ! -e "$ASMFILE" ]
>> -then
>> -  echo "Couldn't find $ASMFILE" >&2
>> -  exit 1
>> -fi
>> -
>> -ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XX)
>> -cd "$ASM_WORK_DIR" &&
>> -as --32 -march=i486 "$ASMFILE" -o x86.o &&
>> -objcopy -O binary x86.o x86.boot &&
>> -dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124 &&
>> -xxd -i x86.bootsect |
>> -sed -e 's/.*int.*//' > x86.hex &&
>> -cat - x86.hex < "$HEADER"
>> -/* This file is automatically generated from
>> - * tests/migration/x86-a-b-bootblock.s, edit that and then run
>> - * tests/migration/rebuild-x86-bootblock.sh to update,
>> - * and then remember to send both in your patch submission.
>> - */
>> -HERE
>> -
>> -rm x86.hex x86.bootsect x86.boot x86.o
>> -cd .. && rmdir "$ASM_WORK_DIR"
>> diff --git a/tests/migration/x86-a-b-bootblock.h 
>> b/tests/migration/x86-a-b-bootblock.h
>> index 78a151fe2a..9e8e2e028b 100644
>> --- a/tests/migration/x86-a-b-bootblock.h
>> +++ b/tests/migration/x86-a-b-bootblock.h
>> @@ -1,6 +1,6 @@
>>  /* This file is automatically generated from
>>   * tests/migration/x86-a-b-bootblock.s, edit that and then run
>> - * tests/migration/rebuild-x86-bootblock.sh to update,
>> + * "make x86-a-b-bootblock.h" inside tests/migration to update,
>>   * and then remember to send both in your patch submission.
>>   */
>>  unsigned char x86_bootsect[] = {
>> diff --git a/tests/migration/x86-a-b-bootblock.s 
>> b/tests/migration/x86-a-b-bootblock.s
>> index b1642641a7..98dbfab084 100644
>> --- a/tests/migration/x86-a-b-bootblock.s
>> +++ b/tests/migration/x86-a-b-bootblock.s
>> @@ -3,9 +3,8 @@
>>  #  

Re: [Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Dr. David Alan Gilbert]

* Wei Huang (w...@redhat.com) wrote:
> The x86 boot block header currently is generated with a shell script.
> To better support other CPUs (e.g. aarch64), we convert the script
> into Makefile. This allows us to 1) support cross-compilation easily,
> and 2) avoid creating a script file for every architecture.
> 
> Signed-off-by: Wei Huang 

But what happens if you're on a system that doesn't have the cross
compilers?  I found it's too easy to get stuck with it trying
to rebuild the header when there's no need.

Dave

> ---
>  tests/migration/Makefile | 36 
> 
>  tests/migration/rebuild-x86-bootblock.sh | 33 -
>  tests/migration/x86-a-b-bootblock.h  |  2 +-
>  tests/migration/x86-a-b-bootblock.s  |  5 ++---
>  4 files changed, 39 insertions(+), 37 deletions(-)
>  create mode 100644 tests/migration/Makefile
>  delete mode 100755 tests/migration/rebuild-x86-bootblock.sh
> 
> diff --git a/tests/migration/Makefile b/tests/migration/Makefile
> new file mode 100644
> index 00..8fbedaa8b8
> --- /dev/null
> +++ b/tests/migration/Makefile
> @@ -0,0 +1,36 @@
> +#
> +# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
> +#
> +# Authors:
> +#   Dave Gilbert 
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2 or later.
> +# See the COPYING file in the top-level directory.
> +#
> +export __note
> +override define __note
> +/* This file is automatically generated from
> + * tests/migration/$<, edit that and then run
> + * "make $@" inside tests/migration to update,
> + * and then remember to send both in your patch submission.
> + */
> +endef
> +
> +all: x86-a-b-bootblock.h
> +# Dummy command so that make thinks it has done something
> + @true
> +
> +SRC_PATH=../..
> +include $(SRC_PATH)/rules.mak
> +
> +x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
> +
> +x86-a-b-bootblock.h: x86-a-b-bootblock.s
> + $(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
> + $(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
> + dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
> + echo "$$__note" > $@
> + xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
> +
> +clean:
> + rm -f *.bootsect *.boot *.o
> diff --git a/tests/migration/rebuild-x86-bootblock.sh 
> b/tests/migration/rebuild-x86-bootblock.sh
> deleted file mode 100755
> index 86cec5d284..00
> --- a/tests/migration/rebuild-x86-bootblock.sh
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -#!/bin/sh
> -# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
> -# This work is licensed under the terms of the GNU GPL, version 2 or later.
> -# See the COPYING file in the top-level directory.
> -#
> -# Author: dgilb...@redhat.com
> -
> -ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
> -HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
> -
> -if [ ! -e "$ASMFILE" ]
> -then
> -  echo "Couldn't find $ASMFILE" >&2
> -  exit 1
> -fi
> -
> -ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XX)
> -cd "$ASM_WORK_DIR" &&
> -as --32 -march=i486 "$ASMFILE" -o x86.o &&
> -objcopy -O binary x86.o x86.boot &&
> -dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124 &&
> -xxd -i x86.bootsect |
> -sed -e 's/.*int.*//' > x86.hex &&
> -cat - x86.hex < "$HEADER"
> -/* This file is automatically generated from
> - * tests/migration/x86-a-b-bootblock.s, edit that and then run
> - * tests/migration/rebuild-x86-bootblock.sh to update,
> - * and then remember to send both in your patch submission.
> - */
> -HERE
> -
> -rm x86.hex x86.bootsect x86.boot x86.o
> -cd .. && rmdir "$ASM_WORK_DIR"
> diff --git a/tests/migration/x86-a-b-bootblock.h 
> b/tests/migration/x86-a-b-bootblock.h
> index 78a151fe2a..9e8e2e028b 100644
> --- a/tests/migration/x86-a-b-bootblock.h
> +++ b/tests/migration/x86-a-b-bootblock.h
> @@ -1,6 +1,6 @@
>  /* This file is automatically generated from
>   * tests/migration/x86-a-b-bootblock.s, edit that and then run
> - * tests/migration/rebuild-x86-bootblock.sh to update,
> + * "make x86-a-b-bootblock.h" inside tests/migration to update,
>   * and then remember to send both in your patch submission.
>   */
>  unsigned char x86_bootsect[] = {
> diff --git a/tests/migration/x86-a-b-bootblock.s 
> b/tests/migration/x86-a-b-bootblock.s
> index b1642641a7..98dbfab084 100644
> --- a/tests/migration/x86-a-b-bootblock.s
> +++ b/tests/migration/x86-a-b-bootblock.s
> @@ -3,9 +3,8 @@
>  #  range.
>  #  Outputs an initial 'A' on serial followed by repeated 'B's
>  #
> -# run   tests/migration/rebuild-x86-bootblock.sh
> -#   to regenerate the hex, and remember to include both the .h and .s
> -#   in any patches.
> +#  In tests/migration dir, run 'make x86-a-b-bootblock.h' to regenerate
> +#  the hex, and remember to include both the .h and .s in any patches.
>  #
>  # Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
>  # This work is licensed under the terms of the GNU GPL, version 2 or later.
> 

Re: [Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Andrew Jones]

On Fri, Feb 23, 2018 at 03:58:56PM -0600, Wei Huang wrote:
> The x86 boot block header currently is generated with a shell script.
> To better support other CPUs (e.g. aarch64), we convert the script
> into Makefile. This allows us to 1) support cross-compilation easily,
> and 2) avoid creating a script file for every architecture.
> 
> Signed-off-by: Wei Huang 
> ---
>  tests/migration/Makefile | 36 
> 
>  tests/migration/rebuild-x86-bootblock.sh | 33 -
>  tests/migration/x86-a-b-bootblock.h  |  2 +-
>  tests/migration/x86-a-b-bootblock.s  |  5 ++---
>  4 files changed, 39 insertions(+), 37 deletions(-)
>  create mode 100644 tests/migration/Makefile
>  delete mode 100755 tests/migration/rebuild-x86-bootblock.sh
>

Reviewed-by: Andrew Jones 

[Qemu-devel] [PATCH V5 2/4] tests/migration: Convert the boot block compilation script into Makefile

[Wei Huang]

The x86 boot block header currently is generated with a shell script.
To better support other CPUs (e.g. aarch64), we convert the script
into Makefile. This allows us to 1) support cross-compilation easily,
and 2) avoid creating a script file for every architecture.

Signed-off-by: Wei Huang 
---
 tests/migration/Makefile | 36 
 tests/migration/rebuild-x86-bootblock.sh | 33 -
 tests/migration/x86-a-b-bootblock.h  |  2 +-
 tests/migration/x86-a-b-bootblock.s  |  5 ++---
 4 files changed, 39 insertions(+), 37 deletions(-)
 create mode 100644 tests/migration/Makefile
 delete mode 100755 tests/migration/rebuild-x86-bootblock.sh

diff --git a/tests/migration/Makefile b/tests/migration/Makefile
new file mode 100644
index 00..8fbedaa8b8
--- /dev/null
+++ b/tests/migration/Makefile
@@ -0,0 +1,36 @@
+#
+# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
+#
+# Authors:
+#   Dave Gilbert 
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+export __note
+override define __note
+/* This file is automatically generated from
+ * tests/migration/$<, edit that and then run
+ * "make $@" inside tests/migration to update,
+ * and then remember to send both in your patch submission.
+ */
+endef
+
+all: x86-a-b-bootblock.h
+# Dummy command so that make thinks it has done something
+   @true
+
+SRC_PATH=../..
+include $(SRC_PATH)/rules.mak
+
+x86_64_cross_prefix := $(call find-cross-prefix,x86_64)
+
+x86-a-b-bootblock.h: x86-a-b-bootblock.s
+   $(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
+   $(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
+   dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
+   echo "$$__note" > $@
+   xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
+
+clean:
+   rm -f *.bootsect *.boot *.o
diff --git a/tests/migration/rebuild-x86-bootblock.sh 
b/tests/migration/rebuild-x86-bootblock.sh
deleted file mode 100755
index 86cec5d284..00
--- a/tests/migration/rebuild-x86-bootblock.sh
+++ /dev/null
@@ -1,33 +0,0 @@
-#!/bin/sh
-# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
-# This work is licensed under the terms of the GNU GPL, version 2 or later.
-# See the COPYING file in the top-level directory.
-#
-# Author: dgilb...@redhat.com
-
-ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
-HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
-
-if [ ! -e "$ASMFILE" ]
-then
-  echo "Couldn't find $ASMFILE" >&2
-  exit 1
-fi
-
-ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XX)
-cd "$ASM_WORK_DIR" &&
-as --32 -march=i486 "$ASMFILE" -o x86.o &&
-objcopy -O binary x86.o x86.boot &&
-dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124 &&
-xxd -i x86.bootsect |
-sed -e 's/.*int.*//' > x86.hex &&
-cat - x86.hex < "$HEADER"
-/* This file is automatically generated from
- * tests/migration/x86-a-b-bootblock.s, edit that and then run
- * tests/migration/rebuild-x86-bootblock.sh to update,
- * and then remember to send both in your patch submission.
- */
-HERE
-
-rm x86.hex x86.bootsect x86.boot x86.o
-cd .. && rmdir "$ASM_WORK_DIR"
diff --git a/tests/migration/x86-a-b-bootblock.h 
b/tests/migration/x86-a-b-bootblock.h
index 78a151fe2a..9e8e2e028b 100644
--- a/tests/migration/x86-a-b-bootblock.h
+++ b/tests/migration/x86-a-b-bootblock.h
@@ -1,6 +1,6 @@
 /* This file is automatically generated from
  * tests/migration/x86-a-b-bootblock.s, edit that and then run
- * tests/migration/rebuild-x86-bootblock.sh to update,
+ * "make x86-a-b-bootblock.h" inside tests/migration to update,
  * and then remember to send both in your patch submission.
  */
 unsigned char x86_bootsect[] = {
diff --git a/tests/migration/x86-a-b-bootblock.s 
b/tests/migration/x86-a-b-bootblock.s
index b1642641a7..98dbfab084 100644
--- a/tests/migration/x86-a-b-bootblock.s
+++ b/tests/migration/x86-a-b-bootblock.s
@@ -3,9 +3,8 @@
 #  range.
 #  Outputs an initial 'A' on serial followed by repeated 'B's
 #
-# run   tests/migration/rebuild-x86-bootblock.sh
-#   to regenerate the hex, and remember to include both the .h and .s
-#   in any patches.
+#  In tests/migration dir, run 'make x86-a-b-bootblock.h' to regenerate
+#  the hex, and remember to include both the .h and .s in any patches.
 #
 # Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
 # This work is licensed under the terms of the GNU GPL, version 2 or later.
-- 
2.14.3