[Buildroot] [PATCHv3] pkg-generic: detect incorrectly used package

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

Thomas, All,

On 2015-09-01 00:23 +0200, Yann E. MORIN spake thusly:
> On 2015-08-31 23:55 +0200, Thomas Petazzoni spake thusly:
> > In Buildroot, the selection of a package from a Config.in level and
> > from a Makefile level are completely disconnected. This can lead to
> > issues where the build of a package is triggered at the Makefile level
> > due to the package being listed in another package <pkg>_DEPENDENCIES
> > variable, even if that package is not enabled in the configuration.
> [--SNIP--]
> > diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> > index 6a7d97e..e8cf488 100644
> > --- a/package/pkg-generic.mk
> > +++ b/package/pkg-generic.mk
> > @@ -143,6 +143,17 @@ $(foreach dir,$(call qstrip,$(BR2_GLOBAL_PATCH_DIR)),\
> >  
> >  # Configure
> >  $(BUILD_DIR)/%/.stamp_configured:
> > +# Only trigger the check for default builds. If the user forces
> > +# building a package, even if not enabled in the configuration, we
> > +# want to accept it.
> > +ifeq ($(MAKECMDGOALS),)
> > +	@if test "$(TYPE)" = "target" -a -z "$($(KCONFIG_VAR))" ; then \
> > +		echo "ERROR: A package must have added $(PKG) to its _DEPENDENCIES line but" ; \
> > +		echo "forgot to add the corresponding select / depends on $(KCONFIG_VAR)." ; \
> > +		echo "Please review your packages and try again." ; \
> > +		exit 1 ; \
> 
> It might even be interesting to tell the user what those packages might
> be, like so (totally untested):
> 
>     diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
>     index 6a7d97e..03ca9cc 100644
>     --- a/package/pkg-generic.mk
>     +++ b/package/pkg-generic.mk
>     @@ -758,6 +758,9 @@ endif # ifneq ($$(call qstrip,$$($(2)_SOURCE)),)
>      # configuration
>      ifeq ($$($$($(2)_KCONFIG_VAR)),y)
>      
>     +# Store reverse build-dependency information
>     +$$(eval $$(foreach d,$$($(2)_FINAL_ALL_DEPENDENCIES),$$(call UPPER,$$(d))_DEPENDENT_OF += $(1)$$(sep)))
>     +
>      # Ensure the calling package is the declared provider for all the virtual
>      # packages it claims to be an implementation of.
>      ifneq ($$($(2)_PROVIDES),)
> 
> and then, in this new error message (wording to be adapted):
> 
>     echo "Potential culprits are:"; \
>     for p in $($(2)_DEPENDENT_OF); do \

Woops...  $($(PKG)_DEPENDENT_OF)  of course, sicne we don;t have $(2) at
that point in the Makefile...

Regards,
Yann E. MORIN.

>         echo "  - ${p}"; \
>     done
> 
> Thoughts?
> 
> I'll further review that patch tomorrow...
> 
> Regards,
> Yann E. MORIN.
> 
> > +	fi
> > +endif
> >  	@$(call step_start,configure)
> >  	@$(call MESSAGE,"Configuring")
> >  	$(foreach hook,$($(PKG)_PRE_CONFIGURE_HOOKS),$(call $(hook))$(sep))
> > @@ -664,6 +675,8 @@ $$($(2)_TARGET_INSTALL_IMAGES):		PKG=$(2)
> >  $$($(2)_TARGET_INSTALL_HOST):           PKG=$(2)
> >  $$($(2)_TARGET_BUILD):			PKG=$(2)
> >  $$($(2)_TARGET_CONFIGURE):		PKG=$(2)
> > +$$($(2)_TARGET_CONFIGURE):		TYPE=$(4)
> > +$$($(2)_TARGET_CONFIGURE):		KCONFIG_VAR=$$($(2)_KCONFIG_VAR)
> >  $$($(2)_TARGET_RSYNC):                  SRCDIR=$$($(2)_OVERRIDE_SRCDIR)
> >  $$($(2)_TARGET_RSYNC):                  PKG=$(2)
> >  $$($(2)_TARGET_PATCH):			PKG=$(2)
> > -- 
> > 2.5.1
> > 
> > _______________________________________________
> > buildroot mailing list
> > buildroot at busybox.net
> > http://lists.busybox.net/mailman/listinfo/buildroot
> 
> -- 
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-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'