Add GCC 12

The latest version of GCC.
And with this, the glibc-musl-gcc toolchain is complete.

A variety of modern features (default PIE SSP) are enabled.

sysc/gcc-12.2.0/patches/fix-gcc-autoreconf.patch

@@ -0,0 +1,43 @@
+SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+SPDX-FileCopyrightText: 2022 Thomas Schwinge <thomas@codesourcery.com>  
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+Backport of commit 25861cf3a88a07c8dca3fb32d098c0ad756bbe38
+
+====
+With that, we may then run plain 'autoreconf' for all of GCC's subpackages,
+instead of for some of those (that don't use Automake) manually having to run
+the applicable combination of 'aclocal', 'autoconf', 'autoheader'.
+
+See also 'AC_CONFIG_MACRO_DIRS'/'AC_CONFIG_MACRO_DIR' usage elsewhere.
+
+diff --git gcc/configure.ac gcc/configure.ac
+index e1ef2ecf026..45bf7560e6f 100644
+--- gcc/configure.ac
++++ gcc/configure.ac
+@@ -25,6 +25,7 @@
+ 
+ AC_INIT
+ AC_CONFIG_SRCDIR(tree.cc)
++AC_CONFIG_MACRO_DIRS([../config] [..])
+ AC_CONFIG_HEADER(auto-host.h:config.in)
+ 
+ gcc_version=`cat $srcdir/BASE-VER`
+diff --git libobjc/configure libobjc/configure
+index a8fdc643349..6da20b8e4ff 100755
+diff --git libobjc/configure.ac libobjc/configure.ac
+index f8f577cfbef..6f58a45d4cb 100644
+--- libobjc/configure.ac
++++ libobjc/configure.ac
+@@ -20,6 +20,7 @@
+ 
+ AC_INIT(package-unused, version-unused,, libobjc)
+ AC_CONFIG_SRCDIR([objc/objc.h])
++AC_CONFIG_MACRO_DIRS([../config] [..])
+ GCC_TOPLEV_SUBDIRS
+ 
+ # We need the following definitions because AC_PROG_LIBTOOL relies on them
+-- 
+2.31.1
+

sysc/gcc-12.2.0/patches/fix-libiberty-autoreconf.patch

@@ -0,0 +1,34 @@
+SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+SPDX-FileCopyrightText: 2022 Simon Marchi <simon.marchi@efficios.com>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+Backport of commit 1f237573caa5cf72218ea31fe78eb3983a717ca6
+
+====
+
+Add
+
+  AC_CONFIG_MACRO_DIRS([../config])
+
+So that just running:
+
+  $ autoreconf -vf
+
+... does the right thing (no need to specify -I ../config).
+
+diff --git libiberty/configure.ac libiberty/configure.ac
+index 84a7b378fad..28d996f9cf7 100644
+--- libiberty/configure.ac
++++ libiberty/configure.ac
+@@ -2,6 +2,7 @@ dnl Process this file with autoconf to produce a configure script
+ 
+ AC_INIT
+ AC_CONFIG_SRCDIR([xmalloc.c])
++AC_CONFIG_MACRO_DIRS([../config])
+ 
+ # This works around the fact that libtool configuration may change LD
+ # for this particular configuration, but some shells, instead of
+-- 
+2.31.1
+

sysc/gcc-12.2.0/patches/libssp_nonshared.patch

@@ -0,0 +1,35 @@
+SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+SPDX-FileCopyrightText: 2020 Timo Teräs <timo.teras@iki.fi>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+The original motivation from this patch from Alpine Linux:
+
+Subject: [PATCH] Alpine musl package provides libssp_nonshared.a. We link to
+ it unconditionally, as otherwise we get link failures if some objects are
+ -fstack-protector built and final link happens with -fno-stack-protector.
+ This seems to be the common case when bootstrapping gcc, the piepatches do
+ not seem to fully fix the crosstoolchain and  bootstrap sequence wrt.
+ stack-protector flag usage.
+
+Which matches precisely the problem when compiling GCC with --enable-bootstrap
+in live-bootstrap.
+
+---
+ gcc/gcc.cc | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git gcc/gcc.cc gcc/gcc.cc
+index cc99d0b7aa1..c60a75371f8 100644
+--- gcc/gcc.cc
++++ gcc/gcc.cc
+@@ -1004,8 +1004,7 @@ proper position among the other output files.  */
+ 
+ #ifndef LINK_SSP_SPEC
+ #ifdef TARGET_LIBC_PROVIDES_SSP
+-#define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
+-		       "|fstack-protector-strong|fstack-protector-explicit:}"
++#define LINK_SSP_SPEC "-lssp_nonshared"
+ #else
+ #define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
+ 		       "|fstack-protector-strong|fstack-protector-explicit" \

sysc/gcc-12.2.0/patches/new-gettext.patch

@@ -0,0 +1,17 @@
+SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+In new gettext external is required for AM_GNU_GETTEXT.
+
+--- intl/configure.ac	2023-02-07 18:43:58.989786230 +1100
++++ intl/configure.ac	2023-02-07 18:43:02.182632631 +1100
+@@ -4,7 +4,7 @@
+ AC_CONFIG_HEADER(config.h)
+ AC_CONFIG_MACRO_DIR(../config)
+ AM_GNU_GETTEXT_VERSION(0.12.1)
+-AM_GNU_GETTEXT([], [need-ngettext])
++AM_GNU_GETTEXT([external], [need-ngettext])
+ 
+ # This replaces the extensive use of DEFS in the original Makefile.in.
+ AC_DEFINE(IN_LIBINTL, 1, [Define because this is libintl.])