[Buildroot] [PATCH 3/9] Add support for multilib external toolchains

[Thomas Petazzoni]

Hi Grant,

I've recently tried to work again on integrating CodeSourcery
toolchains into Buildroot, but I'm facing issues related to multilib.
I've summed up these issues in the following post:

 http://lists.busybox.net/pipermail/buildroot/2010-January/031421.html

If you have any idea on how to solve the issues, don't hesitate to tell
me.

Thanks!

Thomas

On Thu, 16 Oct 2008 14:32:30 -0600
Grant Likely <grant.likely at secretlab.ca> wrote:

> From: Grant Likely <grant.likely at secretlab.ca>
> 
> Fix buildroot to work with external toolchains using multilib.
> Multilib toolchains have several sets of libraries which they can
> choose between depending on the optimization flags.  For example, a
> single toolchain could have libraries compiled for both hard and soft
> floating point. However, buildroot needs copy the correct version of
> the libraries to match the flags used to compile the applications.
> 
> This patch adds the CPU optimization flags to the execution of GCC
> when determining the location of the libraries to copy.  Passing the
> optimization flags makes the library linking and copying consistent.
> 
> Tested using CodeSourcery PowerPC toolchain on a Xilinx Virtex5 ppc440
> platform.
> ---
> 
>  toolchain/external-toolchain/ext-tool.mk |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> 
> diff --git a/toolchain/external-toolchain/ext-tool.mk
> b/toolchain/external-toolchain/ext-tool.mk index bbf430c..ba10dc7
> 100644 --- a/toolchain/external-toolchain/ext-tool.mk
> +++ b/toolchain/external-toolchain/ext-tool.mk
> @@ -10,7 +10,8 @@ copy_toolchain_lib_root = \
>  	DST="$(strip $2)"; \
>  	STRIP="$(strip $3)"; \
>   \
> -	LIB_DIR=`$(TARGET_CC) -print-file-name=$${LIB} | sed -e
> "s,/$${LIB}\$$,,"`; \
> +	LIB_DIR=`$(TARGET_CC) $(subst ",,$(BR2_TARGET_OPTIMIZATION))
> -print-file-name=$${LIB} | sed -e "s,/$${LIB}\$$,,"`; \
> +	MULTILIB=`$(TARGET_CC) $(subst
> ",,$(BR2_TARGET_OPTIMIZATION)) -print-multi-directory`; \ \
>  	if test -z "$${LIB_DIR}"; then \
>  		echo "copy_toolchain_lib_root: lib=$${LIB} not
> found"; \ @@ -21,7 +22,7 @@ copy_toolchain_lib_root = \
>  	for FILE in `find $${LIB_DIR} -maxdepth 1 -type l -name
> "$${LIB}*"`; do \ LIB=`basename $${FILE}`; \
>  		while test \! -z "$${LIB}"; do \
> -			echo "copy_toolchain_lib_root lib=$${LIB}
> dst=$${DST}"; \
> +			echo "copy_toolchain_lib_root
> multilib=$${MULTILIB} lib=$${LIB} dst=$${DST}"; \ rm -fr
> $(TARGET_DIR)$${DST}/$${LIB}; \ mkdir -p $(TARGET_DIR)$${DST}; \
>  			if test -h $${LIB_DIR}/$${LIB}; then \
> 
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-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com