[Buildroot] [PATCH] core/pkg-kconfig: fix configurators

[Mauro Condarelli <mc5686@mclink.it>]

I can confirm the patch solves the problem for me.
I did a simple test issuing "make linux-menuconfig" right before and after applying the patch, nothing else changed.
The first one failed:
   HOSTCC  scripts/kconfig/mconf.o
   *** Unable to find the ncurses libraries or the
   *** required header files.
   *** 'make menuconfig' requires the ncurses libraries.
   ***
   *** Install ncurses (ncurses-devel) and try again.
   ***

The second worked Ok.

Tested-by: Mauro Condarelli <mc5686@mclink.it>


Il 22/08/2015 19:53, Yann E. MORIN ha scritto:
> Currently, the configurators are using $($(2)_MAKE_ENV) , often derived
> from $(TARGE_MAKE_ENV) , as the environment to be set when calling the
> various configurators.
>
> This means that our host tools are used first, most notably pkg-config
> (from host-pkgconf).
>
> However, this is inherently flawed. Our pkg-config, when set for the
> host, only searches .pc files in $(HOST_DIR) and never ever uses the
> ones from the host. For example, since we do not build a host-qt, our
> pkg-config would not find the host's QtCore.pc et al.
>
> Consequently, on some systems (but not on others?) most of the
> configurators fail to build, especially the latest kernel versions, as
> they have been starting to use pkg-config two years ago.
>
> Fix that by filtering-out sensible values out of the environment, but
> only when calling the configurators.
>
> Reported-by: Mauro Condarelli <mc5686@mclink.it>
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Mauro Condarelli <mc5686@mclink.it>
> ---
>   package/pkg-kconfig.mk | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/package/pkg-kconfig.mk b/package/pkg-kconfig.mk
> index 375607f..158c386 100644
> --- a/package/pkg-kconfig.mk
> +++ b/package/pkg-kconfig.mk
> @@ -96,6 +96,15 @@ $$(error Internal error: no value specified for $(2)_KCONFIG_FILE)
>   endif
>   endif
>   
> +# For the configurators, we do want to use the system-provided host tools, not
> +# the ones we build. This is particularly true for pkg-config; if we use our
> +# pkg-config (from host-pkgconf), then it would not look for the .pc from the
> +# host, but we do need them, especially to find ncurses, GTK+, Qt (resp. for
> +# menuconfig and nconfig, gconfig, xconfig).
> +# So we simply remove our PATH and PKG_CONFIG_* variables.
> +$(2)_CONFIGURATOR_MAKE_ENV = \
> +	$$(filter-out PATH=% PKG_CONFIG=% PKG_CONFIG_SYSROOT_DIR=% PKG_CONFIG_LIBDIR=%,$$($(2)_MAKE_ENV))
> +
>   # Configuration editors (menuconfig, ...)
>   #
>   # We need to apply the configuration fixups right after a configuration
> @@ -112,7 +121,7 @@ endif
>   #
>   $$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS)): $(1)-%: $$($(2)_DIR)/.kconfig_editor_%
>   $$($(2)_DIR)/.kconfig_editor_%: $$($(2)_DIR)/.stamp_kconfig_fixup_done
> -	$$($(2)_MAKE_ENV) $$(MAKE) -C $$($(2)_DIR) \
> +	$$($(2)_CONFIGURATOR_MAKE_ENV) $$(MAKE) -C $$($(2)_DIR) \
>   		$$($(2)_KCONFIG_OPTS) $$(*)
>   	rm -f $$($(2)_DIR)/.stamp_{kconfig_fixup_done,configured,built}
>   	rm -f $$($(2)_DIR)/.stamp_{target,staging,images}_installed