Sync top level configure and makefiles

Sync top level configure and makefiles

This update brings in the following commits from the gcc mainline:

commit b7e5a29602143b53267efcd9c8d5ecc78cd5a62f
Author: Tom Tromey <tom@tromey.com>
Date:   Tue Jan 9 06:25:26 2024 -0700

    Pass GUILE down to subdirectories

    When I enable cgen rebuilding in the binutils-gdb tree, the default is
    to run cgen using 'guile'.  However, on my host, guile is guile 2.2,
    which doesn't work for me -- I have to use guile3.0.

    This patch arranges to pass "GUILE" down to subdirectories, so I can
    use 'make GUILE=guile3.0'.

commit 725fb3595622a4ad8cd078a42fab1c395cbf90cb
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Wed Oct 25 13:06:48 2023 +0200

    build: Add libgrust as compilation modules

    Define the libgrust directory as a host compilation module as well as
    for targets. Disable target libgrust if we're not building target
    libstdc++.

commit 56ca59a03150cf44cea340f58967c990ed6bf43c
Author: Lewis Hyatt <lhyatt@gmail.com>
Date:   Thu Nov 16 11:18:37 2023 -0500

    Makefile.tpl: Avoid race condition in generating site.exp from the top level

    A command like "make -j 2 check-gcc-c check-gcc-c++" run in the top level of
    a fresh build directory does not work reliably. That will spawn two
    independent make processes inside the "gcc" directory, and each of those
    will attempt to create site.exp if it doesn't exist and will interfere with
    each other, producing often a corrupted or empty site.exp. Resolve that by
    making these targets depend on a new phony target which makes sure site.exp
    is created first before starting the recursive makes.

commit 6a6d3817afa02bbcd2388c8e005da6faf88932f1
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sun Mar 28 14:48:17 2021 +0100

    Config,Darwin: Allow for configuring Darwin to use embedded runpath.

    Recent Darwin versions place contraints on the use of run paths
    specified in environment variables.  This breaks some assumptions
    in the GCC build.

    This change allows the user to configure a Darwin build to use
    '@rpath/libraryname.dylib' in library names and then to add an
    embedded runpath to executables (and libraries with dependents).

    The embedded runpath is added by default unless the user adds
    '-nodefaultrpaths' to the link line.

    For an installed compiler, it means that any executable built with
    that compiler will reference the runtimes installed with the
    compiler (equivalent to hard-coding the library path into the name
    of the library).

    During build-time configurations  any "-B" entries will be added to
    the runpath thus the newly-built libraries will be found by exes.

    Since the install name is set in libtool, that decision needs to be
    available here (but might also cause dependent ones in Makefiles,
    so we need to export a conditional).

    This facility is not available for Darwin 8 or earlier, however the
    existing environment variable runpath does work there.

    We default this on for systems where the external DYLD_LIBRARY_PATH
    does not work and off for Darwin 8 or earlier.  For systems that can
    use either method, if the value is unset, we use the default (which
    is currently DYLD_LIBRARY_PATH).

commit 2551e10038a70901f30b2168e6e3af4536748f3c
Author: Sergei Trofimovich <siarheit@google.com>
Date:   Mon Oct 2 12:08:17 2023 +0100

    Makefile.tpl: disable -Werror for feedback stage [PR111663]

    Without the change profiled bootstrap fails for various warnings on
    master branch as:

        $ ../gcc/configure
        $ make profiledbootstrap
        ...
        gcc/genmodes.cc: In function ‘int main(int, char**)’:
        gcc/genmodes.cc:2152:1: error: ‘gcc/build/genmodes.gcda’ profile count data file not found [-Werror=missing-profile]
        ...
        gcc/gengtype-parse.cc: In function ‘void parse_error(const char*, ...)’:
        gcc/gengtype-parse.cc:142:21: error: ‘%s’ directive argument is null [-Werror=format-overflow=]

    The change removes -Werror just like autofeedback does today.

commit d1bff1ba4d470f6723be83c0e3c4d5083e51877a
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Thu Jun 1 23:07:37 2023 +0200

    Pass 'SYSROOT_CFLAGS_FOR_TARGET' down to target libraries [PR109951]

    ..., where we need to use it (separate commits) for build-tree testing, similar
    to 'gcc/Makefile.in:site.exp':

        # TEST_ALWAYS_FLAGS are flags that should be passed to every compilation.
        # They are passed first to allow individual tests to override them.
            @echo "set TEST_ALWAYS_FLAGS \"$(SYSROOT_CFLAGS_FOR_TARGET)\"" >> ./site.tmp

            PR testsuite/109951
            * Makefile.tpl (BASE_TARGET_EXPORTS): Add
            'SYSROOT_CFLAGS_FOR_TARGET'.
            * Makefile.in: Regenerate.