svn commit: r366766 - head

[John Baldwin]

On 10/16/20 8:16 AM, Kyle Evans wrote:
> Author: kevans
> Date: Fri Oct 16 15:16:23 2020
> New Revision: 366766
> URL: https://svnweb.freebsd.org/changeset/base/366766
> 
> Log:
>   Makefile: add a small blurb about building with gcc xtoolchain
>   
>   The key details are to install the appropriate flavor of devel/freebsd-gcc9
>   and pass CROSS_TOOLCHAIN while building.
>   
>   Suggested by:	kib
> 
> Modified:
>   head/Makefile
> 
> Modified: head/Makefile
> ==============================================================================
> --- head/Makefile	Fri Oct 16 14:28:13 2020	(r366765)
> +++ head/Makefile	Fri Oct 16 15:16:23 2020	(r366766)
> @@ -89,6 +89,15 @@
>  # 10.  `reboot'
>  # 11.  `make delete-old-libs' (in case no 3rd party program uses them anymore)
>  #
> +# For individuals wanting to build from source with GCC from ports, first build
> +# or install an appropriate flavor of devel/freebsd-gcc9.  The packages produced
> +# by this port are named "${TARGET_ARCH}-gcc9" -- note that not all
> +# architectures supported by FreeBSD have an external gcc toolchain available.
> +#
> +# Once the appropriate freebsd-gcc package is installed, simply pass
> +# CROSS_TOOLCHAIN=${TARGET_ARCH}-gcc9 while building with the above steps,
> +# e.g., `make buildworld CROSS_TOOLCHAIN=amd64-gcc9`.

gcc9 is probably still a bit premature.  'make USE_GCC_TOOLCHAINS=yes tinderbox'
still uses gcc6 as I still have several open reviews for gcc9 fixes, though
OpenZFS regressed the build for both gcc6 and gcc9 as Adrian is finding.

I think I would also just suggest 'pkg install ${TARGET_ARCH}-gcc6' rather than
building the port.  That is what 'make tinderbox' suggests.

-- 
John Baldwin