[Buildroot] [PATCH 2/2] Makefile: test if "dot" exists in graph-build and <pkg>-graph-depends

[Yann E. MORIN <yann.morin.1998@free.fr>]

Fabio, All,

On 2014-06-13 19:06 +0200, Fabio Porcedda spake thusly:
> Because the "dot" command availability was checked only for the
> "graph-depends" target so move the check to the "graph-prerequisites"
> target to be able to check the "dot" command availability for all the
> graph generation targets.
>
> Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Yann E. MORIN <yann.morin.1998@free.fr>
> ---
>  Makefile               | 8 ++++++--
>  package/pkg-generic.mk | 2 +-
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 86acbbf..3e395b5 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -658,7 +658,11 @@ legal-info: dirs legal-info-clean legal-info-prepare $(TARGETS_LEGAL_INFO) \
>  show-targets:
>  	@echo $(HOST_DEPS) $(TARGETS_HOST_DEPS) $(TARGETS) $(TARGETS_ROOTFS)
>  
> -graph-build: $(O)/build/build-time.log
> +graph-prerequisites:
> +	@dot -? >/dev/null 2>&1 || \
> +		(echo "ERROR: The 'dot' program from Graphviz is needed for graph-depends" >&2; exit 1)

While at it, the usual convention for this construct it to not use a
sub-shell, but use:
    thing-to-test || {echo MESSAGE >&2; exit 1;}

Yes, the last semi-colon is needed.

Because some shells might not corectly error out when a sub-shell exits
with a non-zero error code (ie. it was the case in a previous version of
bash.)

> +graph-build: $(O)/build/build-time.log graph-prerequisites

graph-build does not use 'dot', it uses matplotlib internally, so should
probably not depend on graph-prerequisites.

>  	@install -d $(O)/graphs
>  	$(foreach o,name build duration,./support/scripts/graph-build-time \
>  					--type=histogram --order=$(o) --input=$(<) \
> @@ -669,7 +673,7 @@ graph-build: $(O)/build/build-time.log
>  				   --output=$(O)/graphs/build.pie-$(t).$(BR_GRAPH_OUT) \
>  				   $(if $(BR2_GRAPH_ALT),--alternate-colors)$(sep))
>  
> -graph-depends:
> +graph-depends: graph-prerequisites
>  	@dot -? >/dev/null 2>&1 || \
>  		(echo "ERROR: The 'dot' program from Graphviz is needed for graph-depends" >&2; exit 1)

Then you should probably remove the check here, no?

Regards,
Yann E. MORIN.

>  	@$(INSTALL) -d $(O)/graphs
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index ccd7f3b..752392d 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -531,7 +531,7 @@ endif
>  $(1)-show-depends:
>  			@echo $$($(2)_FINAL_DEPENDENCIES)
>  
> -$(1)-graph-depends:
> +$(1)-graph-depends: graph-prerequisites
>  			@$(INSTALL) -d $(O)/graphs
>  			@cd "$(CONFIG_DIR)"; \
>  			$(TOPDIR)/support/scripts/graph-depends -p $(1) $(BR2_GRAPH_DEPS_OPTS) \
> -- 
> 2.0.0
> 

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