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[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.
>
> Usage example as a patch to glibc's scripts/build-many-libcs.py:
>
> diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
> index 580d25e8ee..3a6a7be76b 100755
> --- a/scripts/build-many-glibcs.py
> +++ b/scripts/build-many-glibcs.py
> @@ -1446,17 +1446,7 @@ class Config(object):
> # required to define inhibit_libc (to stop some parts of
> # libgcc including libc headers); --without-headers is not
> # sufficient.
> - cfg_opts += ['--enable-languages=c', '--disable-shared',
> - '--disable-threads',
> - '--disable-libatomic',
> - '--disable-decimal-float',
> - '--disable-libffi',
> - '--disable-libgomp',
> - '--disable-libitm',
> - '--disable-libmpx',
> - '--disable-libquadmath',
> - '--disable-libsanitizer',
> - '--without-headers', '--with-newlib',
> + cfg_opts += ['--enable-first-stage-cross',
> '--with-glibc-version=%s' % self.ctx.glibc_version
> ]
> cfg_opts += self.first_gcc_cfg
>
>
> Bootstrapped/regtested on x86_64-pc-linux-gnu, and
> tested with build-many-glibcs.py with the above patch.
>
> OK for mainline?
>
>
> ChangeLog:
>
> * configure.ac: Add --enable-first-stage-cross.
> * configure: Regenerate.
>
> gcc/ChangeLog:
>
> * doc/install.texi: Document --enable-first-stage-cross.
> ---
> configure | 20 ++++++++++++++++++++
> configure.ac | 15 +++++++++++++++
> gcc/doc/install.texi | 7 +++++++
> 3 files changed, 42 insertions(+)
>
> diff --git a/configure b/configure
> index 85ab9915402..df59036e258 100755
> --- a/configure
> +++ b/configure
> @@ -787,6 +787,7 @@ ac_user_opts='
> enable_option_checking
> with_build_libsubdir
> with_system_zlib
> +enable_first_stage_cross
> enable_as_accelerator_for
> enable_offload_targets
> enable_offload_defaulted
> @@ -1514,6 +1515,9 @@ Optional Features:
> --disable-option-checking ignore unrecognized --enable/--with options
> --disable-FEATURE do not include FEATURE (same as
> --enable-FEATURE=no)
> --enable-FEATURE[=ARG] include FEATURE [ARG=yes]
> + --enable-first-stage-cross
> + Build a static-only compiler that is sufficient to
> + build glibc.
> --enable-as-accelerator-for=ARG
> build as offload target compiler. Specify offload
> host triple by ARG
> @@ -2961,6 +2965,22 @@ case $is_cross_compiler in
> no) skipdirs="${skipdirs} ${cross_only}" ;;
> esac
>
> +# Check whether --enable-first-stage-cross was given.
> +if test "${enable_first_stage_cross+set}" = set; then :
> + enableval=$enable_first_stage_cross; ENABLE_FIRST_STAGE_CROSS=$enableval
> +else
> + ENABLE_FIRST_STAGE_CROSS=no
> +fi
> +
> +case "${ENABLE_FIRST_STAGE_CROSS}" in
> + yes)
> + noconfigdirs="$noconfigdirs target-libatomic target-libquadmath
> target-libgomp target-libssp"
> + host_configargs="$host_configargs --disable-shared --disable-threads
> --disable-decimal-float --without-headers --with-newlib"
> + target_configargs="$target_configargs --disable-shared"
> + enable_languages=c
> + ;;
> +esac
> +
> # If both --with-headers and --with-libs are specified, default to
> # --without-newlib.
> if test x"${with_headers}" != x && test x"${with_headers}" != xno \
> diff --git a/configure.ac b/configure.ac
> index 1df038b04f3..53f920c1a2c 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -268,6 +268,21 @@ case $is_cross_compiler in
> no) skipdirs="${skipdirs} ${cross_only}" ;;
> esac
>
> +AC_ARG_ENABLE(first-stage-cross,
> +[AS_HELP_STRING([--enable-first-stage-cross],
> + [Build a static-only compiler that is
> + sufficient to build glibc.])],
> +ENABLE_FIRST_STAGE_CROSS=$enableval,
> +ENABLE_FIRST_STAGE_CROSS=no)
> +case "${ENABLE_FIRST_STAGE_CROSS}" in
> + yes)
> + noconfigdirs="$noconfigdirs target-libatomic target-libquadmath
> target-libgomp target-libssp"
> + host_configargs="$host_configargs --disable-shared --disable-threads
> --disable-decimal-float --without-headers --with-newlib"
> + target_configargs="$target_configargs --disable-shared"
> + enable_languages=c
> + ;;
> +esac
> +
> # If both --with-headers and --with-libs are specified, default to
> # --without-newlib.
> if test x"${with_headers}" != x && test x"${with_headers}" != xno \
> diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
> index 6eee1bb43d4..b19923769e0 100644
> --- a/gcc/doc/install.texi
> +++ b/gcc/doc/install.texi
> @@ -2501,6 +2501,13 @@ When you use this option, you should ensure that
> @var{dir} includes
> @command{ranlib} and @command{strip} if necessary, and possibly
> @command{objdump}. Otherwise, GCC may use an inconsistent set of
> tools.
> +
> +@item --enable-first-stage-cross
> +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 @option{--with-newlib}, @option{--without-headers},
> +@option{--disable-decimal-float}, @option{--disable-shared},
> +@option{--disable-threads} and sets @option{--enable-languages=c}.
> @end table
>
> @subsubheading Overriding @command{configure} test results
