Re: PING^2: [PATCH] Add --enable-first-stage-cross configure option

[Jonathan Wakely <jwakely@redhat.com>]

On 10/01/22 00:26 +0300, Serge Belyshev wrote:
>Ping: [PATCH] Add --enable-first-stage-cross configure option
>https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575318.html
>
>
>Add --enable-first-stage-cross configure option
>
>Build static-only, C-only compiler that is sufficient to cross compile
>glibc.  This option disables various runtime libraries that require
>libc to compile, turns on --with-newlib, --without-headers,
>--disable-decimal-float, --disable-shared, --disable-threads, and sets
>--enable-languages=c.

>Rationale: current way of building first stage compiler of a cross
>toolchain requires specifying a list of target libraries that are not
>going to be compiled due to their dependency on target libc.  This
>list is not documented in gccinstall.texi and sometimes changes.  To
>simplify the procedure, it is better to maintain that list in the GCC
>itself.

I think this is a great idea.

I don't think it makes any difference to this patch, but I've just
committed a change to libstdc++ so that you no longer neeed to add
--with-newlib when libstdc++ is configured with --without-headers
(because it's counter-intuitive to have to say which libc you're using
when not using any libc).

I only tested it for --disable-hosted-libstdcxx --without-headers
because I am not sure what libstdc++ even does if you build it hosted
but --without-headers.