introduce a way to build GCC without the isl library

if NOGCCISL is set, don't build or link against isl. should fix PR#58505.

tools/gcc/Makefile: force std=c++11 for GCC 12 builds

GCC >= 11 now requires C++11 to build. Impacted individual components
vary whether they test for if std=c++11 is the default or has to be
passed

tools/gcc/Makefile: force std=c++11 for GCC 12 builds

GCC >= 11 now requires C++11 to build. Impacted individual components
vary whether they test for if std=c++11 is the default or has to be
passed. Regardless, our build infrastructure applies its own overrides.
Force this setting so that we can still build on NetBSD 8.x hosts (and
probably 7.x, too). Build tested on NetBSD 8.3.

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tools/gcc/Makefile: fix typo in comment

enable isl support for GCC 12.

Include the local NetBSD GCC version so that bumps to it trigger rebuilds

unfortunately, this will cause one rebuild to get the new name.

tools/gcc: Sprinkle NB_FIX_VAX_BACKEND for vax to enable gcc.old MI fixes

PR port-vax/57646: Import major vax toolchain fix by Kalvis Duckmanton

jump through hoops to make the native build find gmp for gdb.

updates for GCC 12 (relatively tiny).

- gcov-iov.h is now called version.h and we build it directly.
- need to explicitly ask for bversion.h gtyp-input.list to be built.

gcc 10 is now in gcc.old, make mknative-gcc.old gcc-10 happy.

Patch the build script and toolchain to allow passing through
HOST_CPPFLAGS, HOST_CXXFLAGS, but not LIBRARY_PATH because it breaks
the build. These variables are necessary to support building NetBSD

Patch the build script and toolchain to allow passing through
HOST_CPPFLAGS, HOST_CXXFLAGS, but not LIBRARY_PATH because it breaks
the build. These variables are necessary to support building NetBSD
from a GNU Guix or NixOS host, where /usr/include, /lib, and all
but /bin/sh do not exist. In many cases, support for HOST_CPPFLAGS
was incomplete. From Ryan Sundberg

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Disable again initfini; breaks some archs and not worth dealing with when
we have both gcc's active in the tree.

enable initfini-array since all platforms support it.

add a netbsd version for GCC 10. properly generate omp-device-properties.h.

fetch omp-device-properties.h and don't try to fetch sanitizer
stuff automatically yet.

pass down earm* not earmv5* to mknative-gcc.

disable fetching stuff from libsanitizer for now. it needs libstdc++
to build in mknative using gcc makefiles, and our locale changes break
the "normal" build of this.

make sure MKNATIVE_TARGET is

disable fetching stuff from libsanitizer for now. it needs libstdc++
to build in mknative using gcc makefiles, and our locale changes break
the "normal" build of this.

make sure MKNATIVE_TARGET is always set. since mknative-gcc doesn't
care about the version any more (we keep two versions for gcc/gcc.old)
simply set it to "gcc".

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set MODULE to ${EXTERNAL_GCC_SUBDIR} so this actually works..

add something to auto-detect when GCC has changed from gcc to gcc.old
or back and auto-cleandir tools/gcc.

based upon the code for PREVIOUSTOOLDIR in tools/Makefile.

arm needs more files

remove HAVE_GCC == 6 support, add HAVE_GCC == 8 support

Fix bugurl. PR toolchain/48712

enable the workarounds for cortex a53 errata 835769 and 843419 by default.

Remove "--disable-libstdcxx-dual-abi". This option does not do what
it says: Instead of disabling the dual-abi and letting you choose
which one you want, it disables the cxx11 abi and the
"--with-def

Remove "--disable-libstdcxx-dual-abi". This option does not do what
it says: Instead of disabling the dual-abi and letting you choose
which one you want, it disables the cxx11 abi and the
"--with-default-libstdcxx-abi=OPTION" becomes a noop. Removing the
old COW compatibility ABI is not easy. For more info see:

https://gcc.gnu.org/onlinedocs/libstdc++/manual/configure.html
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html

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don't pass --disable-symver to mknative configure. this turns off
the checking for gcc 4.6 and some exception handling routines which
we need on several platforms.

this should fix missing symbol is

don't pass --disable-symver to mknative configure. this turns off
the checking for gcc 4.6 and some exception handling routines which
we need on several platforms.

this should fix missing symbol issues seen on current-users.

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add || true to the gthr-default.h copy, it can fail first time around