merge GCC 10.5.0.

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 8.4.0.

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 6.5. needs mknative as some new files appeared.

PR/53008: Henning Petersen: Fix missing brace inside comment.

import GCC 6.4.0. see this url for details which are too large to
include here:

http://gcc.gnu.org/gcc-6/changes.html

the main visible changes appear to be:

- The default mode for C++ is now -

import GCC 6.4.0. see this url for details which are too large to
include here:

http://gcc.gnu.org/gcc-6/changes.html

the main visible changes appear to be:

- The default mode for C++ is now -std=gnu++14 instead of -std=gnu++98.
- The C and C++ compilers now support attributes on enumerators.
- Diagnostics can now contain "fix-it hints"
- more warnings (some added to -Wall)

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initial import of GCC 5.5.0. this fixes a very large number of PRs.
280 are listed here:
https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=5.5
and th

initial import of GCC 5.5.0. this fixes a very large number of PRs.
280 are listed here:
https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=5.5
and this list is likely not complete, and not reproduced here. the
only specific change in functionality is removal of x86 "pcommit"
instruction (which was apparently never implemented.)

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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 4.8.3 which has 98 bugs fixed on gcc-4-8-3-pre-r208254

import GCC 4.8.3 at r208254. these GCC PRs are fixed since r206687:

c++/37140 c++/41174 c++/54652 c++/55800 c++/57043 c++/57524 c++/57899
c++/58466 c++/58504 c++/58606 c++/58632 c++/58639 c++/58672

import GCC 4.8.3 at r208254. these GCC PRs are fixed since r206687:

c++/37140 c++/41174 c++/54652 c++/55800 c++/57043 c++/57524 c++/57899
c++/58466 c++/58504 c++/58606 c++/58632 c++/58639 c++/58672 c++/58812
c++/58814 c++/58835 c++/58837 c++/58845 c++/58873 c++/58965 c++/59097
c++/59224 c++/59646 c++/59838 c++/59989 c++/60046 c++/60108 c++/60146
c++/60182 c++/60187 c++/60216 c++/60219 c++/60248 c++/60272 c++/60274
c/59891 driver/60233 ipa/55260 libgcc/60166 middle-end/58809 middle-end/59860
middle-end/60004 middle-end/60221 middle-end/60291 objc/56870 other/56653
rtl-optimization/57422 rtl-optimization/60116 target/55426 target/57896
target/58710 target/59142 target/59379 target/59462 target/59695 target/59718
target/59777 target/59794 target/59826 target/59880 target/60017 target/60193
target/60207 tree-optimization/59903 tree-optimization/60115
tree-optimization/60183 tree-optimization/60276

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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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Import of gcc 4.5.4. The (possibly incomplete) list of fixed bugs is

50617 [4.5/4.6/4.7 Regression] ICE: RTL flag check: INSN_ANNULLED_BRANCH_P used with unexpected rtx code 'simplify_immed_subreg

Import of gcc 4.5.4. The (possibly incomplete) list of fixed bugs is

50617 [4.5/4.6/4.7 Regression] ICE: RTL flag check: INSN_ANNULLED_BRANCH_P used with unexpected rtx code 'simplify_immed_subreg' in output_bb, at config/pa/pa.c:6631
45383 [4.5 Regression] Implicit conversion to pointer does no longer automatically generate operator== and operator!=.
45606 [4.5 Regression] match a method prototyped a typedef alias with the original type (using stdlib)
47398 [4.5 Regression] tree check: accessed elt 10 of tree_vec with 9 elts in tsubst, at cp/pt.c:10500
49951 [4.5/4.6/4.7 Regression] Debug stepping behavior regarding g++ Class destructor has changed for the worse starting at gcc 4.5.0
43190 [4.4 Regression] Used pointer typedefs eliminated from debug info
43866 [4.4 Regression] wrong code with -fbounds-check -funswitch-loops
43897 [4.4 Regression] IA-64 asm clobbers are ignored
44777 [4.4 Regression] ICE: SIGSEGV with -fprofile-use in gcc.c-torture/execute/comp-goto-2.c
46985 [4.5 Regression] ICE: SIGSEGV in is_gimple_min_invariant (gimple.c:2742) with -fno-tree-ccp -fno-tree-dominator-opts -fno-tree-fre
47780 [4.5 Regression] -fcompare-debug failure with -O -fgcse -fgcse-las -fstack-protector-all
47858 [4.5/4.6/4.7 Regression] IPA-SRA decreases quality of debug info
47903 [4.5 Regression] var-tracking.c: valgrind error
48685 [4.5 Regression] ICE in gimplify_expr, at gimplify.c:7034
52139 [4.5 Regression] ICE: in remove_insn, at emit-rtl.c:3960 with -O -fPIC -fno-tree-dominator-opts -fno-tree-fre
48046 [4.5 Regression] Expected diagnostic "reference to 'type' is ambiguous" not given for function-local static declaration
51406 [4.5/4.6/4.7 Regression][c++0x] Incorrect result of static_cast to rvalue reference to base class.
43949 [4.4 Regression] bogus warning: array subscript is above array bounds
45982 [4.4 Regression] PTA does not track integers
48172 [4.5 Regression] incorrect vectorization of loop in GCC 4.5.* with -O3
49115 [4.5 Regression] invalid return value optimization (?) when exception is thrown and caught
49279 [4.5 Regression] Optimization incorrectly presuming constant variable inside loop in g++ 4.5 and 4.6 with -O2 and -O3 for x86_64 targets
50189 [4.5 Regression] Wrong code error in -O2 [-fstrict-enums] compile, target independent
48660 [4.5/4.6 Regression] ARM ICE in expand_expr_real_1
23656 Cross-compilation with newlib fails in libiberty
37985 [4.5/4.6/4.7/4.8 Regression] unsigned char shift lacks "statement with no effect" warning
38292 [4.5/4.6/4.7/4.8 Regression] corrupted profile info with -O[23] -fprofile-use
40778 [4.5 Regression] Mudflap instrumentation missing in cloned function.
40992 [4.4 Regression] cunroll ignoring asm size
48306 [4.4 Regression] presence of gcc subdir with . in PATH causes breakdown
49651 [4.4 Regression] nested lambdas and -O3 produced incorrect integer variable increments
52223 [4.5/4.6 Regression] libffi's man page install breaks with multilibs and overridden mandir
53418 [4.5 Regression] ICE at gimplify.c:7773
53138 [4.7 Regression] spaceship operator miscompiled
50091 [4.5/4.6/4.7 Regression] -fstack-check generates wrong assembly
50979 architecture mismatch: "mul32" not enabled for "smul" or "umul"
51187 miscompilation of genrecog.c at -O2 for --target=avr
52717 thunk referenced in discarded section when building samba with -flto
48742 [4.5 Regression] Internal error in gimplify_expr
49120 [4.5 Regression] bogus "value computed is not used" warning (variable-length array in compound statement)
49161 [4.5 Regression] Fix VRP on switch stmts
49619 [4.5 Regression] ICE in simplify_subreg, at simplify-rtx.c:5362
49621 [4.5 regression] ICE in trunc_int_for_mode, at explow.c:57
49644 [4.5 Regression] post-increment of promoted operand is incorrect.
51767 [4.5 Regression] ICE with degenerated asm goto
51768 [4.5 Regression] ICE with invalid asm goto
52736 [4.5/4.6/4.7/4.8 Regression] miscompilation: store to aliased __m128d is 8 Bytes off
49440 [4.6 regression] Invalid dynamic_cast for unnamed namespace
50565 [4.5/4.6/4.7 Regression] initializer element is not computable at load time
52294 [4.7 Regression] [ARM Thumb] generated asm code produces "branch out of range" error in gas with -Os -mcpu=cortex-a9
41159 [LTO] ICE in insert_value_copy_on_edge, at tree-outof-ssa.c:225
48822 [4.5 Regression] G++ gets stucks and never finishes compilation when enabling -O2/3 optimization options.
50162 [4.5 Regression] Wrong vectorization
49381 Unresolved symbols in libgcjgc.a when linking gctest
45786 [4.5 Regression] Relational operators .eq. and == are not recognized as equivalent
48708 Invalid V2DI vector set insn generated
50464 Using -Ofast -march=bdver1 results in internal compiler error: in extract_insn, at recog.c:2109
51821 [4.5/4.6/4.7 Regression] 64bit > 32bit conversion produces incorrect results with optimizations
52698 -maddress-mode=long doesn't work
53228 [4.6/4.7/4.8 Regression] target attributes in libcpp/lex.c cause illegal instructions to be used elsewhere
42082 [C++0x] ICE on probably invalid with "canonical types differ for identical types"
42652 vectorizer created unaligned vector insns
42856 [4.4 Regression] FAIL: gcc.dg/torture/pr41555.c -O0 (test for excess errors)
47733 psignal (int, const? char*) in libiberty/strsignal.h
48743 -march=native mis-detects AMD K6-2+ / K6-3 as Athlon - compiled C fails with "illegal instruction"
49038 [4.5/4.6/4.7 Regression] -ftree-vectorise introduces reads past end of array
49448 arm-tab-linux-gnu-eabi enableds big endian when it should not
49461 boehm-gc and gcj incompatible with pie
50875 O3 and -mavx lead to internal compiler error: in find_reloads
51161 [C++0x] Illegal static_cast to rvalue reference to ambiguous base class
51393 Wrong parameter type for _mm256_insert_epi64 in avxintrin.h
51444 [4.4 Regression]: Spurious "is used uninitialized" warning for structure with bitfields
51835 ARM EABI violation when passing arguments to helper floating functions like __aeabi_d2iz
52894 [4.5,4.6,4.7 Regression] Stage1 bootstrap fails with gcc-4.6.3: Infinite loop in pointer_set_insert
53310 [4.5/4.6/4.7/4.8 Regression] EOSHIFT leaks memory
53744 gcov version oscillates between 407* and 407p on branches
52335 [4.4/4.5/4.6/4.7 Regression] I/O: -std=f95 rejects valid DELIM= in OPEN
46192 [4.5/4.6/4.7 regression] wrong code for renaming of volatile packed array with address clause
44581 [4.5/4.6/4.7 Regression] internal compiler error: in simplify_subreg
49307 [4.5/4.6/4.7 Regression] ICE in spill_failure, at reload1.c:2113
50163 [4.4/4.5/4.6/4.7 Regression] ICE: initialization expression
50273 [4.5/4.6/4.7 Regression] -Walign-commons no longer effective
52022 [4.5/4.6/4.7 Regression] Wrong-code with procedures passed as actual argument
52452 [4.5/4.6/4.7/4.8 Regression] INTRINSIC cannot be applied to gfortran's ETIME
25973 [4.5/4.6/4.7/4.8 Regression] Wrong warning: control reaches end of non-void function
53521 [4.5/4.6/4.7/4.8 Regression] Memory leak with zero-sized array constructor

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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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