[Buildroot] [PATCH] toolchain-external: add a check for broken toolchains

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

Le 01/02/2016 12:31, Romain Naour a ?crit :
> Some toolchain release can be broken due to sysroot location issue,
> so the $(ARCH)-linux-gnu-gcc -print-file-name=libc.a command is
> broken and return only "libc.a"
> 
> This lead to an error during the header check version helper,
> so these toolchains can't be imported into Buildroot.
> 
> cc1: fatal error: $PWD/libc.a/usr/include/linux/version.h: No such file or directory
> compilation terminated.
> support/scripts/check-kernel-headers.sh: line 38: /tmp/check-headers.4V5PPF: Permission denied
> 
> This issue happen with the first linaro 2015.11 [1] release and
> CodeSourcery standard edition [2].
> 
> Here is the sysroot directory tree for linaro 2015.11:
> $ ls libc/arm-linux-gnueabihf
> etc  lib  sbin  usr  var
> 
> Here is the sysroot directory tree for CodeSourcery standard:
> $ ls libc/sgxx-glibc
> etc  lib  lib64  sbin  usr  var
> 
> Usually the sysroot is located directly under libc directory
> $ ls libc/
> etc  lib  sbin  usr  var
> 
> Add a check to error out with an explicit error message
> 
> [1] https://bugs.linaro.org/show_bug.cgi?id=1995#c7
> [2] http://lists.busybox.net/pipermail/buildroot/2014-October/110696.html
> 
> Signed-off-by: Romain Naour <romain.naour@gmail.com>

Please forget this patch, it doesn't work as expected :(
I'll move the check to check_unusable_toolchain helper instead.

Best regards,
Romain

> ---
>  toolchain/toolchain-external/toolchain-external.mk | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/toolchain/toolchain-external/toolchain-external.mk b/toolchain/toolchain-external/toolchain-external.mk
> index 9ebf7bd..303a32a 100644
> --- a/toolchain/toolchain-external/toolchain-external.mk
> +++ b/toolchain/toolchain-external/toolchain-external.mk
> @@ -478,6 +478,10 @@ define TOOLCHAIN_EXTERNAL_CONFIGURE_CMDS
>  		@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
>  		exit 1 ; \
>  	fi ; \
> +	if test "$${SYSROOT_DIR}" = "libc.a" ; then \
> +		@echo "External toolchain broken, unable to find the main sysroot. Cannot use." ; \
> +		exit 1 ; \
> +	fi ; \
>  	$(call check_kernel_headers_version,\
>  		$(call toolchain_find_sysroot,$(TOOLCHAIN_EXTERNAL_CC)),\
>  		$(call qstrip,$(BR2_TOOLCHAIN_HEADERS_AT_LEAST))); \
> @@ -571,6 +575,10 @@ define TOOLCHAIN_EXTERNAL_INSTALL_TARGET_LIBS
>  		@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
>  		exit 1 ; \
>  	fi ; \
> +	if test "$${SYSROOT_DIR}" = "libc.a" ; then \
> +		@echo "External toolchain broken, unable to find the main sysroot. Cannot use." ; \
> +		exit 1 ; \
> +	fi ; \
>  	ARCH_SYSROOT_DIR="$(call toolchain_find_sysroot,$(TOOLCHAIN_EXTERNAL_CC) $(TOOLCHAIN_EXTERNAL_CFLAGS))" ; \
>  	ARCH_LIB_DIR="$(call toolchain_find_libdir,$(TOOLCHAIN_EXTERNAL_CC) $(TOOLCHAIN_EXTERNAL_CFLAGS))" ; \
>  	SUPPORT_LIB_DIR="" ; \
>