[Mesa-dev] [PATCH] docs/autoconf: mention CC/CXX when doing multilib builds

[Ilia Mirkin]

On Wed, Aug 13, 2014 at 5:16 PM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
> Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
> ---
>
> Unless someone object I would like to squash this patch with the
> previous one.
>
> -Emil
>
>  docs/autoconf.html | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/docs/autoconf.html b/docs/autoconf.html
> index f27838f..c225659 100644
> --- a/docs/autoconf.html
> +++ b/docs/autoconf.html
> @@ -141,14 +141,26 @@ assembly will not be used.</p>
>  <dt><code>--host=</code></dt>
>  <dd><p>By default, the build will compile code for the architecture that
>  it's running on. In order to build Mesa on a x64-86 machine that is to run

While you're fixing stuff, x86-64

> -on a i686, one would need to set the options to:
> +on a i686, one would need to set the options to:</p>
>
>  <p><code>--build=i686-pc-linux-gnu --host=i686-pc-linux-gnu</code></p>
>
>  Note that these can vary from distribution to distribution. For more
>  information check with the
>  <a href="https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Specifying-Target-Triplets.html">
> -autoconf manual</a>.</p>
> +autoconf manual</a>.
> +
> +
> +<p>In some cases a single compiler is capable of handling both architectures
> +in that case one would need to set the <code>CC,CXX</code> variables
> +appending the correct machine options. Seek your compiler documentation for
> +further information -
> +<a href="https://gcc.gnu.org/onlinedocs/gcc/Submodel-Options.html"> gcc
> +machine dependent options</a></p>
> +
> +<p>The following is the complete setup needed to compile on my Archlinux setup</p>

There's nothing about the below that's specific to Arch, or any
distro, really -- I'd avoid the explicit distro reference. Do you
actually need the --build and --host things? I thought that was if you
were going to use a cross-compiler. I only have
x86_64-pc-linux-gnu-gcc, no i686-...-gnu-gcc.

In the past I've just done CFLAGS=-m32 CXXFLAGS=-m32 and it has worked
like a charm. But perhaps there's a downside to doing that...

> +
> +<code>./configure CC="gcc -m32" CXX="g++ -m32" --build=i686-unknown-linux-gnu --host=i686-unknown-linux-gnu ...</code>
>  </dd>
>  </dl>
>
> --
> 2.0.2
>
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