Log Message:
Update to 4.9.3. The following bugs were fixed:

[4.9 Regression] select case with strings and -fgcse -O
[4.9 Regression] Executes wrong function inside an anonymous namespace on runtime
[4.9 Regression] Predictive commoning after loop vectorization produces \ 
incorrect code.
[4.9/5 Regression] wrong code (segfaults) at -Os on x86_64-linux-gnu
[4.9.2/5 Regression] Bootstrap broken on powerpc-apple-darwin, cc1: internal \ 
compiler error: in init_reg_sets
[4.9 Regression] FAIL: gcc.dg/ipa/pr63551.c (test for excess errors)
[4.9 Regression] internal compiler error: Max. number of generated reload insns \ 
per insn is achieved (90)
[4.9/5 Regression] ERROR: can't read additional_sources: no such variable
[4.9/5 Regression] Thumb1 ICE caused by no register to spill
[4.9 Regression] GCC 4.9.2 bootstrap fails on ARM, haifa-sched.c:6507:1: \ 
internal compiler error: in lra_create
[4.9 Regression] FAIL: gcc.target/powerpc/pr53199.c scan-assembler-times *
[4.9 Regression] ICE on invalid code on x86_64-linux-gnu: tree check: expected \ 
class ‘type’, have ‘exceptional’ (error_mark) in \ 
create_tmp_from_val, at gimplify.c:491
[4.9 Regression]: Unaligned access with -O3 -mtune=k8
[4.8/4.9 Regression] Introducing an unrelated template parameter causes \ 
compilation to fail
[4.9 Regression] const int (&in)[]{1,2,3,4,5}; results in internal compiler \ 
error: Segmentation fault
[4.9/5 Regression] ICE with -frepo
[4.9/5/6 Regression] NSDMI calling constexpr constructor with pointer-to-member \ 
is not a constant expression
bootstrap failure on x32
[4.9 Regression] -O2 miscompiles with -mtune=nehalem or corei7
[4.9 Regression] Wrong results with loop vectorization of: "var[i] = \ 
ABS_EXPR<var2[i]> > 9.9e-7"
[4.9 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa \ 
(in 64-bit mode)
[4.9/5 Regression] ssa corruption when compiled with -O3
[4.9 Regression] Incorrect warning "array subscript is above array bounds"
[4.9 regression] ICE with lto related to variably modified type
[4.8 Regression] Missed vectorization with bdver1
[4.9 Regression] ICE: in extract_constrain_insn_cached, at recog.c:2117 with \ 
-flive-range-shrinkage -mdispatch-scheduler -march=bdver4
[4.9/5 regression] libsanitizer fails to build with old glibc
[4.9/5 Regression] undefined label in jump_table_data
[4.9 Regression] ICE on valid code at -O3 on x86_64-linux-gnu in \ 
vectorizable_reduction, at tree-vect-loop.c:4913
[4.9 regression] FAIL: gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c \ 
scan-tree-dump-times slp2" basic block vectorized using SLP" 1
[4.9 regression] -Wunused-variable: warning supressed by virtual dtor
[4.9 Regression] Using class reference as template parameter causes compilation \ 
to fail
[4.9 Regression] gcc-4_9 inlines less funcs than gcc-4_8 because of \ 
used_as_abstract_origin flag
[4.9/5 Regression] ICE: in update_visibility_by_resolution_info, at \ 
ipa-visibility.c:427
[4.9/5 Regression] ICE: : in rs6000_delegitimize_address, at \ 
config/rs6000/rs6000.c:7051
[4.9/5 Regression] SIGBUS in gen_group_rtx compiling 64-bit \ 
gcc.dg/vect/vect-singleton_1.c
AddressSanitizer reports *-buffer-overflow in destructor when multiple virtual \ 
inheritance is used
ICE in verify_gimple_assign_single
[4.9 Regression] CSE on x86 asm()-s no longer working due to PR/60663 fix
[4.8 Regression] ICE at -O1 and above with -g enabled on x86_64-linux-gnu
[4.9/5 Regression] ICE at omp lowering
[5 Regression] ICE with lambda in default argument of template function
[4.9/5.0 Regression][c++11] ICE on variadic alias template with wrappers
[4.9/5 Regression] Error in template instantiation in GCC 4.9, works fine in GCC 4.8
[4.9/5/6 Regression] Bogus linkage errors for member class of anonymous class
[4.9/5/6 Regression] Default move assignment does not move array members
Simplifying vec_select of vec_concat miscompiles when first element of \ 
vec_concat is const_int
ICE in tree_to_uhwi, at tree.h:3668
std::this_thread::sleep_until can cause inifinite sleep
[4.9/5 Regression] std::uninitialized_copy tests assignability the wrong way, \ 
resulting in performance pessimization
-fsanitize=nonnull-attribute errors in stl_algobase.h
[UBSAN] stl_algobase.h:708:7: runtime error: null pointer passed as argument
[4.9 regression] Octave -O3 build: internal compiler error: in prepare_cmp_insn, \ 
at optabs.c:4237
[4.8 Regression] Vectorization fails because of CLOBBER statements
[4.8 Regression] Element swizzling produces invalid result with -O3
[4.8 Regression] inefficient FDO instrumentation code
[4.9 Regression] Incorrect calculation when assigning to array with -O3
[4.9 Regression] ICE: Segmentation fault with -g -flto
[4.8 Regression] wrong code at -O3 on x86_64-linux-gnu
Postreload CSE propagates aliased memory operand
Scheduler performs Invalid move of aliased memory reference
Gcc on Alpha: Error: No lda !gpdisp!282 was found
avx512fintrin.h:5344:1: internal compiler error: in curr_insn_transform, at \ 
lra-constraints.c:3494
ICE: in extract_insn, at recog.c:2341 (unrecognizable insn) with \ 
-mmemcpy-strategy=rep_8byte:-1:noalign -m32 -mtune=btver2
gnatmake doesn't report the options it actually provides to ranlib
[4.8 Regression] Const overloads resolution failure
[4.9/5 Regression] powerpc fp-bit ices at dwf_regno
Merging function DECLs discards leaf attribute which causes cfg verifier to fail
[4.9/5 Regression] Erroneous warning about taking address of register with std=c++1y
[4.9/5 Regression] ICE: verify_flow_info failed: control flow in the middle of \ 
basic block with -fprofile-generate
Missing intrinsic functions in avx512intrin.h
[4.9 Regression] array subscript is above array bounds [-Werror=array-bounds]
ICE when non-variadic template template parameter is default argument of \ 
variadic template template parameter
[4.9 Regression] Constexpr variables can trigger spurious compiler warnings
ASan reported heap-buffer-overflow in \ 
gcc.target/i386/avx256-unaligned-load{store}-7.c
ICE in GCC powerpc64le top of trunk with -mupper-regs-df
[X86_64] With -mcmodel=medium .lrodata accesses do not use 64-bit addresses
[4.9 Regression] internal compiler error: in asan_expand_check_ifn (with \ 
-fsanitize=address)
[4.9/5 Regression] [SH] Miscompilation of boolean negation on SH4 using -O2
conflicting definitions in parallel/algo.h and algorithmfwd.h
ICE: SIGSEGV in decide_alg() with -mmemset-strategy=libcall:-1:align \ 
-minline-all-stringops
[4.9 Regression] bootstrap error: segv in c parser
ICE: in decide_alg, at config/i386/i386.c:24510 with \ 
-mmemcpy-strategy=libcall:-1:align -minline-stringops-dynamically
shared_mutex compile errors on bare-metal targets
missed warning for unused variable.
ICE: SIGSEGV in get_attrs_for (trans-mem.c:179) with -fgnu-tm and #pragma GCC ivdep
[4.9/5 Regression] Undefined .L* symbol starting with jump2 on s390x
New overloads of std::is_permutation dereference past-the-end iterator
std::experimental::bad_optional_access is not default constructible
[4.9 Regression] ICE in symtab_remove_unreachable_nodes, at ipa.c:547 on \ 
arm-linux-gnueabihf
[4.8/4.9/5 Regression] ICE with {} initialized array with string
array<T,0>::begin()/end() etc. forms a null reference and breaks on clang+ubsan
Missing "using namespace literals::chrono_literals" in std::chrono
arm*-linux* "link" spec passes '-dynamic-linker' even for '-shared'
[4.9 Regression] ICE: definition in block 4 does not dominate use in block 2 \ 
with -fnon-call-exceptions -fsanitize=enum
False positive in array bound check in a for loop
[4.9 Regression] ICE (in add_stores, at var-tracking.c:6000) on arm-linux-gnueabihf
[4.9/5/6 Regression] missing DW_AT_abstract_origin for cross-unit call sites
[4.9/5 Regression] overriding final function defined out of line does not lead \ 
to an error
[4.8/4.9 Regression] ICE in avr-gcc when passing struct member to varargs function
avr_adjust_insn_length uses recog_memoized on invalid insn
[4.9/5 Regression] Memory leak with allocatable CLASS components
[4.9/5 Regression] Invalid memory reference in a compiler-generated finalizer \ 
for allocatable component
[4.9/5 Regression] NAMELIST bug with f2003: reads too far
[4.8 Regression] ICE on cyclically dependent polymorphic types
[4.9/5 Regression] [OOP] ICE on valid with finalizable array components
[4.9/5 Regression] ICE in gfc_conv_descriptor_data_get for generated finalizer
[4.9/5 Regression] -freorder-blocks-and-partition causes some failures on SH
[4.9/5 Regression] ICE(segfault) when passing coarrays around; ICE in \ 
gfc_zero_size_array in arith.c:1637
[SH][4.9 Regression] "insn does not satisfy its constraints" when \ 
compiling libmcrypt