[Buildroot] [PATCH v7 5/8] package/pkg-generic: make libtool .la files compatible with per-package directories

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

Thomas, All,

On 2018-12-28 11:43 +0100, Thomas Petazzoni spake thusly:
> Libtool .la files unfortunately contain a number of absolute paths,
> which now refer to per-package directories. Due to this, when building
> package A, .la files may contain absolute paths referring to
> directories in package B per-package sysroot. This causes some -L
> flags referring to other sysroot from being added, which doesn't work
> as the linker no longer realizes that such paths are within its
> sysroot.
> 
> To fix this, we introduce a replacement step of .la files in the
> configure step, to make sure all paths refer to this package
> per-package directory.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> ---
>  package/pkg-generic.mk | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index 8ea86514d7..9575639b43 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -126,6 +126,21 @@ endef
>  GLOBAL_INSTRUMENTATION_HOOKS += step_user
>  endif
>  
> +#######################################
> +# Helper functions
> +
> +# Make sure .la files only reference the current per-package
> +# directory.
> +
> +# $1: package name (lower case)
> +# $2: staging directory of the package
> +ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)
> +define fixup-libtool-files
> +	$(Q)find $(2)/usr/lib* -name "*.la" | xargs --no-run-if-empty \
> +		$(SED) "s:$(PER_PACKAGE_DIR)/[^/]*/:$(PER_PACKAGE_DIR)/$(1)/:g"
                                    ^^^^^^^
This can match the string '//'. Don't you in fact want to match at least
one char? I.e.:  $(PER_PACKAGE_DIR)/[^/]+/

> +endef
> +endif
> +
>  ################################################################################
>  # Implicit targets -- produce a stamp file for each step of a package build
>  ################################################################################
> @@ -222,6 +237,7 @@ $(BUILD_DIR)/%/.stamp_configured:
>  	@$(call step_start,configure)
>  	@$(call MESSAGE,"Configuring")
>  	$(call prepare-per-package-directory,$($(PKG)_FINAL_DEPENDENCIES))
> +	$(call fixup-libtool-files,$(NAME),$(STAGING_DIR))

At some point, we may have to turn that into a generic hook-registration
mechanism.

For example, in inner-generic-package:

    $(2)_PRE_CONFIGURE_HOOKS_FINAL = \
        PREPARE_PER_PACKAGE_DIRECTORY \
        FIXUP_LIBTOOL_FILES \
        $($(2)_PRECONFIGURE_HOOKS)

>  	$(foreach hook,$($(PKG)_PRE_CONFIGURE_HOOKS),$(call $(hook))$(sep))

... and here, we'd use $($(PKG)_PRE_CONFIGURE_HOOKS_FINAL).

Similarly for the other hooks, of course...

But that's for the future! ;-)

Regards,
Yann E. MORIN.

>  	$($(PKG)_CONFIGURE_CMDS)
>  	$(foreach hook,$($(PKG)_POST_CONFIGURE_HOOKS),$(call $(hook))$(sep))
> @@ -879,6 +895,7 @@ $$($(2)_TARGET_INSTALL_IMAGES):		PKG=$(2)
>  $$($(2)_TARGET_INSTALL_HOST):		PKG=$(2)
>  $$($(2)_TARGET_BUILD):			PKG=$(2)
>  $$($(2)_TARGET_CONFIGURE):		PKG=$(2)
> +$$($(2)_TARGET_CONFIGURE):		NAME=$(1)
>  $$($(2)_TARGET_RSYNC):			SRCDIR=$$($(2)_OVERRIDE_SRCDIR)
>  $$($(2)_TARGET_RSYNC):			PKG=$(2)
>  $$($(2)_TARGET_PATCH):			PKG=$(2)
> -- 
> 2.20.1
> 

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