[Buildroot] [PATCH] toolchain/external: use -dumpversion to check gcc version

[Thomas Petazzoni]

Hello,

On Thu, 9 Mar 2017 09:01:36 +0100, Krzysztof Konopko wrote:
> Currently, `--version` option is used and later matched with a regex to get
> the actual gcc version.  There's a dedicated gcc option to do exactly that:
> `-dumpversion`.
> 
> Also `--version` may return a string customised by a vendor that provides
> the toolchain, which makes the current regex approach error prone.  In
> fact, this situation has been seen with a real customised toolchain.
> 
> Signed-off-by: Krzysztof Konopko <kris at youview.com>
> Signed-off-by: Tomasz Szkutkowski <tomasz.szkutkowski at youview.com>
> ---
>  toolchain/helpers.mk | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied to master, thanks. I was worried that -dumpversion might have
been a recent gcc option, but I found it in gcc 3.4 documentation, so
we're good.

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com