Re: [Qemu-devel] [PATCH] keycodemapdb: try fix makefile deps

["Daniel P. Berrange" <berrange@redhat.com>]

On Fri, Oct 06, 2017 at 01:13:42PM +0200, Gerd Hoffmann wrote:
> (1) make .git-submodule-status depend on config-host.mak,
>     for GIT_SUBMODULES changes.
> 
> (2) make $(KEYCODEMAP_{GEN,CSV}) depend on .git-submodule-status
>     so make knows what to do if they are not there.
> 
> I still get errors because make tries to generate the files before they are checked out,
> but make seems to notice it has to start over and correctly generates the files on the
> second attempt.
> 
> [ ... ]
>   GEN     config-host.h
>   GEN     module_block.h
>   GEN     ui/input-keymap-linux-to-qcode.c
>   GEN     ui/input-keymap-qcode-to-qnum.c
>   GEN     ui/input-keymap-qnum-to-qcode.c
> python: can't open file '/home/kraxel/projects/qemu/ui/keycodemapdb/tools/keymap-gen': [Errno 2] No such file or directory
> python: can't open file '/home/kraxel/projects/qemu/ui/keycodemapdb/tools/keymap-gen': [Errno 2] No such file or directory
> python: can't open file '/home/kraxel/projects/qemu/ui/keycodemapdb/tools/keymap-gen': [Errno 2] No such file or directory

We could perhaps avoid that error message by changing the make rule to
do    "test -e $(KEYCODEMAP_GEN) && $(KEYCODEMAP_GEN) || exit 0"

> make: Leaving directory `/home/kraxel/projects/qemu/build-default'
> make: Entering directory `/home/kraxel/projects/qemu/build-default'
>   GIT     ui/keycodemapdb
>   GEN     trace/generated-tcg-tracers.h
>   GEN     trace/generated-helpers-wrappers.h
>   GEN     trace/generated-helpers.h
>   GEN     trace/generated-helpers.c
>   GEN     ui/input-keymap-linux-to-qcode.c
>   GEN     ui/input-keymap-qcode-to-qnum.c
>   GEN     ui/input-keymap-qnum-to-qcode.c
>   CC      qga/main.o
> [ ... ]
> ---
>  Makefile | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 1d3b31f074..c97258629e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -33,7 +33,7 @@ git-submodule-update:
>  endif
>  endif
>  
> -.git-submodule-status: git-submodule-update
> +.git-submodule-status: git-submodule-update config-host.mak
>  
>  Makefile: .git-submodule-status
>  
> @@ -225,7 +225,7 @@ KEYCODEMAP_FILES = \
>  
>  GENERATED_FILES += $(KEYCODEMAP_FILES)
>  
> -ui/input-keymap-%.c: $(KEYCODEMAP_GEN) $(KEYCODEMAP_CSV) $(SRC_PATH)/ui/Makefile.objs .git-submodule-status
> +ui/input-keymap-%.c: $(KEYCODEMAP_GEN) $(KEYCODEMAP_CSV) $(SRC_PATH)/ui/Makefile.objs
>  	$(call quiet-command,\
>  	    src=$$(echo $@ | sed -E -e "s,^ui/input-keymap-(.+)-to-(.+)\.c$$,\1,") && \
>  	    dst=$$(echo $@ | sed -E -e "s,^ui/input-keymap-(.+)-to-(.+)\.c$$,\2,") && \
> @@ -235,6 +235,9 @@ ui/input-keymap-%.c: $(KEYCODEMAP_GEN) $(KEYCODEMAP_CSV) $(SRC_PATH)/ui/Makefile
>  	          code-map $(KEYCODEMAP_CSV) $${src} $${dst} \
>  	        > $@ || rm $@, "GEN", "$@")
>  
> +$(KEYCODEMAP_GEN): .git-submodule-status
> +$(KEYCODEMAP_CSV): .git-submodule-status
> +
>  # Don't try to regenerate Makefile or configure
>  # We don't generate any of them
>  Makefile: ;

This looks like a plausible solution to the problem. I've just kicked off
a travis buld with the patch applied:

https://travis-ci.org/berrange/qemu/builds/284220642

Regards,
Daniel
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