[Buildroot] [PATCH] toolchain-external: add a specific check to avoid Angstrom toolchains

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

Thomas, All,

On 2013-10-12 12:14 +0200, Thomas Petazzoni spake thusly:
> The Angstrom toolchains available at
> http://www.angstrom-distribution.org/toolchains/ are not usable as
> external toolchains in Buildroot, because they are not pure toolchains
> with just the C library, but instead complete SDKs with many
> cross-compiled libraries (Gtk, Qt, glib, neon, sqlite, X.org, and many
> more, approximately 200 MB of libraries).
> 
> Buildroot cannot use such toolchains, and while this is documented in
> our manual, some users still try to do this. Today, one such user came
> on the IRC channel, reporting a build problem, which we started
> investigating, only to realize after a long time that he was using an
> Angstrom toolchain.
> 
> To avoid this problem in the future, we explicitly check if the
> toolchain is from Angstrom by looking at the vendor part of the tuple
> exposed by the toolchain: as soon as it is
> <something>-angstrom-<something-else>, we reject the toolchain with an
> explanation.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

> ---
>  toolchain/helpers.mk                               | 18 ++++++++++++++++++
>  toolchain/toolchain-external/toolchain-external.mk |  1 +
>  2 files changed, 19 insertions(+)
> 
> diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk
> index 95120cd..d81e561 100644
> --- a/toolchain/helpers.mk
> +++ b/toolchain/helpers.mk
> @@ -324,3 +324,21 @@ check_cross_compiler_exists = \
>  		echo "Cannot execute cross-compiler '$${__CROSS_CC}'" ; \
>  		exit 1 ; \
>  	fi
> +
> +#
> +# Check for toolchains known to not work with Buildroot. To check for
> +# Angstrom toolchains, we're taking the "Target: " line in the output
> +# of gcc -v, and look at the vendor part of the tuple.
> +#
> +# $1: cross-gcc path
> +#
> +check_wrong_toolchain = \
> +	__CROSS_CC=$(strip $1) ; \
> +	vendor=`$${__CROSS_CC} -v 2>&1 | sed -n '/^Target/s/Target: [^-]*-\([^-]*\)-.*/\1/p'` ; \
> +	if test $${vendor} = "angstrom" ; then \
> +		echo "Angstrom toolchains are not pure toolchains: they contain" ; \
> +		echo "many other libraries than just the C library, which makes" ; \
> +		echo "them unsuitable as external toolchains for build systems" ; \
> +		echo "such as Buildroot" ; \
> +		exit 1 ; \
> +	fi
> diff --git a/toolchain/toolchain-external/toolchain-external.mk b/toolchain/toolchain-external/toolchain-external.mk
> index b5b1ce7..102bcfd 100644
> --- a/toolchain/toolchain-external/toolchain-external.mk
> +++ b/toolchain/toolchain-external/toolchain-external.mk
> @@ -371,6 +371,7 @@ endif
>  # type of C library and all C library features.
>  define TOOLCHAIN_EXTERNAL_CONFIGURE_CMDS
>  	$(Q)$(call check_cross_compiler_exists,$(TOOLCHAIN_EXTERNAL_CC))
> +	$(Q)$(call check_wrong_toolchain,$(TOOLCHAIN_EXTERNAL_CC))
>  	$(Q)LIBC_A_LOCATION=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a)` ; \
>  	SYSROOT_DIR=`echo $${LIBC_A_LOCATION} | sed -r -e 's:(usr/)?lib(32|64)?/(.*/)?libc\.a::'` ; \
>  	if test -z "$${SYSROOT_DIR}" ; then \
> -- 
> 1.8.1.2
> 
> _______________________________________________
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> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

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