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.

merge GCC 5.5.0. this does not include updated man/info pages (yet).

merge GCC 5.3. round 1. this probably won't work :-)

libsanitizer likely needs to be re-ported, though i've done most of
the updating we'll need i think already.

merge GCC 4.8 2014-10-09, part 1.

merge GCC r208254.

merge gcc 4.8.2 r206687 (part 2).

If -march=native is specified, only enable AVX if the processor supports
it and the OS has enabled XGETBV for application use.
It might need to also check XCR0[2] (having executed XGETBV) to check

If -march=native is specified, only enable AVX if the processor supports
it and the OS has enabled XGETBV for application use.
It might need to also check XCR0[2] (having executed XGETBV) to check that
the kernel actually supports saving the YMM registers, but I suspect the
kernel might defer setting that until the first fault.
See vol 1 section 13.5 of the Intel SDM (intel_x86_325462.pdf).
Fixes toolchain/45673

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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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