[Buildroot] [PATCH v2] pkg-infra: add <pkg>_CONFIG_FIXUP to fix *-config files

[Arnout Vandecappelle <arnout@mind.be>]

On 10/01/13 20:52, Stefan Fr?berg wrote:
> This patch will add<pkg>_CONFIG_FIXUP variable to buildroot infra.
> It's purpose is to inform buildroot that the package in question
> contains some $(STAGING_DIR)/usr/bin/*-config files and that we
> want to automatically fix prefixes of such files.
>
> It is often the case that many packages call these
> files during their configuration step to determine 3rd party
> library package locations and any flags needed to link against them.
>
> For example:
> Some package might try to check the existense and linking flags
> of NSPR package by calling $(STAGING_DIR)/usr/bin/nspr-config --prefix.
> Without this fix, NSPR would return /usr/ as it's prefix which is
> wrong when cross-compiling.
> Correct would be $(STAGING_DIR)/usr.
>
> All packages that have<pkg>_INSTALL_STAGING = YES defined and
> also install some config file(s) into $(STAGING_DIR)/usr/bin must
> hereafter also define<pkg>_CONFIG_FIXUP with the corresponding
> filename(s).
>
> For example:
>
> DIVINE_CONFIG_FIXUP = divine-config
>
> or for multiple files:
>
> IMAGEMAGICK_CONFIG_FIXUP = Magick-config Wand-config
>
> Signed-off-by: Stefan Fr?berg<stefan.froberg@petroprogram.com>
> ---
>   package/pkg-generic.mk |    6 ++++++
>   1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index a570ad7..9f6ea7b 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -121,6 +121,12 @@ $(BUILD_DIR)/%/.stamp_staging_installed:
>   	@$(call MESSAGE,"Installing to staging directory")
>   	$($(PKG)_INSTALL_STAGING_CMDS)
>   	$(foreach hook,$($(PKG)_POST_INSTALL_STAGING_HOOKS),$(call $(hook))$(sep))
> +	$(Q)if test -n "$($(PKG)_CONFIG_FIXUP)" ; then \
> +		$(call MESSAGE,"Fixing package configuration files") ;\
> +		$(SED) "s,^prefix=.*,prefix=$(STAGING_DIR)/usr,g" \
> +			-e "s,^exec_prefix=.*,exec_prefix=$(STAGING_DIR)/usr,g" \
> +			$(addprefix $(STAGING_DIR)/usr/bin/,$($(PKG)_CONFIG_FIXUP)) ;\
> +	fi

  I just discovered that you can also write:

ifneq ($($(PKG)_CONFIG_FIXUP),)
	@$(call MESSAGE,"Fixing package configuration files")
	$(Q)$(SED) "s,^prefix=.*,prefix=$(STAGING_DIR)/usr,g" \
	  -e "s,^exec_prefix=.*,exec_prefix=$(STAGING_DIR)/usr,g" \
	  $(addprefix $(STAGING_DIR)/usr/bin/,$($(PKG)_CONFIG_FIXUP))
endif

  Yes, you can use make conditions in rule definitions!

  [How I love micro-optimizing Makefiles :-)]

  Regards,
  Arnout

>   	$(Q)touch $@
>
>   # Install to images dir


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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