[Buildroot] [PATCH v4 1/3] toolchain: allow side by side sysroot directories

[Romain Naour <romain.naour@gmail.com>]

Hi Vicente,

Le 15/12/2015 17:21, Vicente Olivert Riera a ?crit :
> Currently our toolchain infrastructure assumes that every toolchain has
> nested sysroot directories. However that's not true for all of them. The
> Codescape toolchains from Imagination Technologies use a side by side
> sysroot structure, for instance.
> 
> This patch allows our toolchain infrastructure to detect what kind of
> sysroot structure we have (nested or side by side) and performs the
> appropriate actions.
> 
> Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
> ---
> Changes v1 -> v4:
>  - This patch didn't exist before. It has been introduced in v4.
> 
>  toolchain/helpers.mk | 28 +++++++++++++++++-----------
>  1 file changed, 17 insertions(+), 11 deletions(-)
> 
> diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk
> index 1452ec6..1b9d12f 100644
> --- a/toolchain/helpers.mk
> +++ b/toolchain/helpers.mk
> @@ -142,18 +142,24 @@ copy_toolchain_sysroot = \
>  				$${ARCH_SYSROOT_DIR}/$$i/ $(STAGING_DIR)/$$i/ ; \
>  		fi ; \
>  	done ; \
> -	if [ `readlink -f $${SYSROOT_DIR}` != `readlink -f $${ARCH_SYSROOT_DIR}` ] ; then \
> -		if [ ! -d $${ARCH_SYSROOT_DIR}/usr/include ] ; then \
> -			cp -a $${SYSROOT_DIR}/usr/include $(STAGING_DIR)/usr ; \
> -		fi ; \
> -		mkdir -p `dirname $(STAGING_DIR)/$${ARCH_SUBDIR}` ; \
> +	SYSROOT_DIR_CANON=`readlink -f $${SYSROOT_DIR}` ; \
> +	ARCH_SYSROOT_DIR_CANON=`readlink -f $${ARCH_SYSROOT_DIR}` ; \
> +	if [ $${SYSROOT_DIR_CANON} != $${ARCH_SYSROOT_DIR_CANON} ] ; then \
>  		relpath="./" ; \
> -		nbslashs=`printf $${ARCH_SUBDIR} | sed 's%[^/]%%g' | wc -c` ; \
> -		for slash in `seq 1 $${nbslashs}` ; do \
> -			relpath=$${relpath}"../" ; \
> -		done ; \
> -		ln -s $${relpath} $(STAGING_DIR)/$${ARCH_SUBDIR} ; \
> -		echo "Symlinking $(STAGING_DIR)/$${ARCH_SUBDIR} -> $${relpath}" ; \
> +		if [ $${ARCH_SYSROOT_DIR_CANON:0:$${\#SYSROOT_DIR_CANON}} == $${SYSROOT_DIR_CANON} ] ; then \
> +			if [ ! -d $${ARCH_SYSROOT_DIR}/usr/include ] ; then \
> +				cp -a $${SYSROOT_DIR}/usr/include $(STAGING_DIR)/usr ; \
> +			fi ; \
> +			mkdir -p `dirname $(STAGING_DIR)/$${ARCH_SUBDIR}` ; \
> +			nbslashs=`printf $${ARCH_SUBDIR} | sed 's%[^/]%%g' | wc -c` ; \
> +			for slash in `seq 1 $${nbslashs}` ; do \
> +				relpath=$${relpath}"../" ; \
> +			done ; \
> +			ln -s $${relpath} $(STAGING_DIR)/$${ARCH_SUBDIR} ; \
> +			echo "Symlinking $(STAGING_DIR)/$${ARCH_SUBDIR} -> $${relpath}" ; \
> +		elif [ `dirname $${ARCH_SYSROOT_DIR_CANON}` == `dirname $${SYSROOT_DIR_CANON}` ] ; then \
> +			ln -snf $${relpath} $(STAGING_DIR)/`basename $${ARCH_SYSROOT_DIR_CANON}` ; \

Maybe you want the echo a message like we do for nested sysroot toolchains ?
Something like:
echo "Symlinking $(STAGING_DIR)/`basename $${ARCH_SYSROOT_DIR_CANON}` ->
$${relpath}" ; \

Otherwise it look ok.
Reviewed-by: Romain Naour <romain.naour@gmail.com>

Best regards,
Romain
> +		fi ; \
>  	fi ; \
>  	if test -n "$${SUPPORT_LIB_DIR}" ; then \
>  		cp -a $${SUPPORT_LIB_DIR}/* $(STAGING_DIR)/lib/ ; \
>