merge GCC 12.4.0.

initial merge of GCC 12.3.0.

this doesn't include any of the changes to the .c -> .cc files renamed,
and reverts our local changes to the vax port and libsanitizer subdir.
vax GCC was rewritten and

initial merge of GCC 12.3.0.

this doesn't include any of the changes to the .c -> .cc files renamed,
and reverts our local changes to the vax port and libsanitizer subdir.
vax GCC was rewritten and our local fixes no longer are relevant, and
the new libsanitizer is more updated than our old one, and merging via
gcc10->gcc12 is not really possible.

unfortunately, our local changes to libsanitizer that aren't related
to the general update of those sources (ie, the netbsd code) will need
to be re-checked and perhaps re-ported.

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merge GCC 10.4.0.

initial merge of GCC 10.3.0.

these three files are not yet finished merging:

gcc/config/rs6000/rs6000.c
libsanitizer/lsan/lsan_allocator.h
libsanitizer/sanitizer_common/sanitizer_platform_limits_po

initial merge of GCC 10.3.0.

these three files are not yet finished merging:

gcc/config/rs6000/rs6000.c
libsanitizer/lsan/lsan_allocator.h
libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h

our current GCC 9 sanitizers are newer than GCC 10's still, so that
may take a little to untease, so it's probable that more than
these 2 will need more changes.

rs6000.c has some changes related to ABI and supported functionality
that need to be merged forward.

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merge GCC 9.3.0.

merge GCC 8.3.0 pass 1. will not compile yet. thare are still
about 25 files with merge issues.

first pass at merging GCC 7.4.0. unlikely to compile..

merge GCC 6.4.0. sanitizer stuff is probably busted, but most
other changes merged easily.

docs need to be regenerated with modern versions still.

Revert introduction of FIXME_PR_51139

This change introduced ABI incompatible change with older versions shipped
on NetBSD. This back out code that is currently not working correctly due
to TLS-base

Revert introduction of FIXME_PR_51139

This change introduced ABI incompatible change with older versions shipped
on NetBSD. This back out code that is currently not working correctly due
to TLS-based std::call_once implementation in GNU libstdc++.

Error when starting gnuchash:

/usr/pkg/lib/libwebkitgtk-1.0.so.0: Undefined symbol "_ZSt15__once_callable" (symnum = 1705)

PR 51139

Reported by <wiz>

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Add a walkaround for TLS bug in libstdc++ exposed with std::call_once

Currently std::call_once with libstdc++ works only with static linking.
Disable code path using __thread types and introduce FIX

Add a walkaround for TLS bug in libstdc++ exposed with std::call_once

Currently std::call_once with libstdc++ works only with static linking.
Disable code path using __thread types and introduce FIXME_PR_51139.
Problem discussed in PR 51139

Functional std::call_once is required in LLVM and LLDB codebase.

Example code to test std::call_once:
#include <iostream>
#include <thread>
#include <mutex>
#include <cstdlib>
std::once_flag flag;
int main(int argc, char **argv)
{
std::call_once(flag, [](){ std::cout << "Simple example: called once\n"; });
return EXIT_SUCCESS;
}

Sponsored by <The NetBSD Foundation>

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import GCC 5.4.0 release. there's not a lot of new info though at
least these 135 (!) GCC PRs have been fixed by the update:

68730 69714 67550 70209 71254 70839 69737 70067 67355 67172 69239
65779

import GCC 5.4.0 release. there's not a lot of new info though at
least these 135 (!) GCC PRs have been fixed by the update:

68730 69714 67550 70209 71254 70839 69737 70067 67355 67172 69239
65779 69546 70272 70421 65985 67339 67411 68309 68585 68679 68890
68949 69009 70139 70494 68162 69135 70306 68965 70297 70635 66786
69098 70347 69719 70526 70941 69400 69577 69447 65689 65886 65932
66655 68269 68789 69614 69648 69666 69764 69794 70044 70052 65726
68910 64289 68671 68835 69669 70329 71204 69355 67364 68049 68998
69323 69743 69995 69146 68651 67755 67484 68790 68907 69099 69496
69509 69516 70393 69222 69703 69939 70609 71004 71005 71036 71037
71038 68636 69013 69606 70115 70333 70430 60290 70356 69305 70024
67781 69414 69140 70510 60164 66635 67896 68106 68298 68449 68779
68921 68986 69037 69147 69194 69366 69399 69705 69917 69969 70613
71317 69268 70269 69032 65702 69219 69484 65996 66680 68283 69603
70350 67451 61397

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import GCC 5.3.0. see these urls for details which are too large to
include here:

http://gcc.gnu.org/gcc-4.9/changes.html
http://gcc.gnu.org/gcc-5/changes.html

(note that GCC 5.x is a release st

import GCC 5.3.0. see these urls for details which are too large to
include here:

http://gcc.gnu.org/gcc-4.9/changes.html
http://gcc.gnu.org/gcc-5/changes.html

(note that GCC 5.x is a release stream like GCC 4.9.x, 4.8.x, etc.)


the main issues we will have are:

The default mode for C is now -std=gnu11 instead of -std=gnu89.

ARM:
The deprecated option -mwords-little-endian has been removed.
The options -mapcs, -mapcs-frame, -mtpcs-frame and -mtpcs-leaf-frame
which are only applicable to the old ABI have been deprecated.

MIPS:
The o32 ABI has been modified and extended. The o32 64-bit
floating-point register support is now obsolete and has been removed.
It has been replaced by three ABI extensions FPXX, FP64A, and FP64.
The meaning of the -mfp64 command-line option has changed. It is now
used to enable the FP64A and FP64 ABI extensions.

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import GCC 4.8 branch at r206687.

highlights from: http://gcc.gnu.org/gcc-4.6/changes.html

GCC now has stricter checks for invalid command-line options
New -Wunused-but-set-variable and -Wunu

import GCC 4.8 branch at r206687.

highlights from: http://gcc.gnu.org/gcc-4.6/changes.html

GCC now has stricter checks for invalid command-line options
New -Wunused-but-set-variable and -Wunused-but-set-parameter
warnings
Many platforms have been obsoleted
Link-time optimization improvements
A new switch -fstack-usage has been added
A new function attribute leaf was introduced
A new warning, enabled by -Wdouble-promotion
Support for selectively enabling and disabling warnings via
#pragma GCC diagnostic has been added
There is now experimental support for some features from the
upcoming C1X revision of the ISO C standard
Improved experimental support for the upcoming C++0x ISO C++
standard
G++ now issues clearer diagnostics in several cases
Updates for ARM, x86, MIPS, PPC/PPC64, SPARC
Darwin, FreeBSD, Solaris 2, MinGW and Cygwin now all support
__float128 on 32-bit and 64-bit x86 targets. [*1]

highlights from: http://gcc.gnu.org/gcc-4.7/changes.html

The -fconserve-space flag has been deprecated
Support for a new parameter --param case-values-threshold=n
was added
Interprocedural and Link-time optimization improvements
A new built-in, __builtin_assume_aligned, has been added
A new warning option -Wunused-local-typedefs was added
A new experimental command-line option -ftrack-macro-expansion
was added
Support for atomic operations specifying the C++11/C11 memory
model has been added
There is support for some more features from the C11 revision
of the ISO C standard
Improved experimental support for the new ISO C++ standard,
C++11
Updates for ARM, x86, MIPS, PPC/PPC64, SH, SPARC, TILE*
A new option (-grecord-gcc-switches) was added

highlights from: http://gcc.gnu.org/gcc-4.8/changes.html

GCC now uses C++ as its implementation language. This means
that to build GCC from sources, you will need a C++
compiler that understands C++ 2003
DWARF4 is now the default when generating DWARF debug
information
A new general optimization level, -Og, has been introduced
A new option -ftree-partial-pre was added
The option -fconserve-space has been removed
The command-line options -fipa-struct-reorg and
-fipa-matrix-reorg have been removed
Interprocedural and Link-time optimization improvements
AddressSanitizer, a fast memory error detector, has been
added [*2]
A new -Wsizeof-pointer-memaccess warning has been added
G++ now supports a -std=c++1y option for experimentation
with features proposed for the next revision of the
standard, expected around 2014
Improved experimental support for the new ISO C++ standard,
C++11
A new port has been added to support AArch64
Updates for ARM, x86, MIPS, PPC/PPC64, SH, SPARC, TILE*


[*1] we should support this too!
[*2] we should look into this.
https://code.google.com/p/address-sanitizer/

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initial import of GCC 4.5.3 sources. changes since 4.1 are way too numerous
to review, please see http://gcc.gnu.org/gcc-4.5/changes.html (and the 4.2,
4.3 and 4.4 versions, too.)

this includes the

initial import of GCC 4.5.3 sources. changes since 4.1 are way too numerous
to review, please see http://gcc.gnu.org/gcc-4.5/changes.html (and the 4.2,
4.3 and 4.4 versions, too.)

this includes the core, c++, objc and the non java/ada/fortran parts of the
testsuite.

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