As work towards fixing PR tree-optimization/87025, this patch
eliminates global state from optinfo-emit-json.cc in favor
of adding an optional m_json_writer field to dump_context,
replacing the m_forcibly_enable_optinfo flag.

This allows for writing selftests for the interaction of the
JSON-building code with the dumpfile.c code.
In particular, the existing selftest that created optinfo
instances now exercise the JSON-building code (although no
JSON is actually written out).

The patch also simplifies the layering by replacing optinfo::emit ()
with dump_context::emit_optinfo, so that dump_context has
responsibility for keeping track of dump destinations.

gcc/ChangeLog:
	PR tree-optimization/87025
	* dump-context.h: Include "optinfo.h".
	(class optrecord_json_writer): New forward decl.
	(dump_context::forcibly_enable_optinfo_p): Delete.
	(dump_context::optinfo_enabled_p): New member function.
	(dump_context::optimization_records_enabled_p): New member
	function.
	(dump_context::set_json_writer): New member function.
	(dump_context::emit_optinfo): New member function.
	(dump_context::m_forcibly_enable_optinfo): Delete.
	(dump_context::m_json_writer): New member data.
	* dumpfile.c (dump_context::set_json_writer): New member function.
	(dump_context::finish_any_json_writer): New member function.
	(dump_context::end_scope): Replace call to
	optimization_records_maybe_pop_dump_scope with call to
	m_json_writer->pop_scope.
	(dump_context::optinfo_enabled_p): New member function.
	(dump_context::end_any_optinfo): Replace call to optinfo::emit with call
	to dump_context::emit_optinfo.
	(dump_context::emit_optinfo): New member function.
	(temp_dump_context::temp_dump_context): Replace
	m_forcibly_enable_optinfo with call to set_json_writer.
	(temp_dump_context::~temp_dump_context): Clean up any json writer.
	* optinfo-emit-json.cc (class optrecord_json_writer): Move to
	optinfo-emit-json.h
	(the_json_writer): Delete.
	(optimization_records_start): Delete.
	(optimization_records_finish): Delete.
	(optimization_records_enabled_p): Delete, in favor of
	dump_context::optimization_records_enabled_p.
	(optimization_records_maybe_record_optinfo): Delete.
	(optimization_records_maybe_pop_dump_scope): Delete.
	* optinfo-emit-json.h: Include "json.h".  Delete forward
	decl of opt_pass.
	(optimization_records_start): Delete.
	(optimization_records_finish): Delete.
	(optimization_records_enabled_p): Delete.
	(optimization_records_maybe_record_optinfo): Delete.
	(optimization_records_maybe_pop_dump_scope): Delete.
	(class optrecord_json_writer): Move here from
	optinfo-emit-json.cc.
	* optinfo.cc (optinfo::emit_for_opt_problem): Replace call
	to optinfo::emit with call to dump_context::emit_optinfo.
	(optinfo::emit): Delete, in favor of dump_context::emit_optinfo.
	(optinfo_enabled_p): Delete, in favor of
	dump_context::optinfo_enabled_p.
	(optinfo_wants_inlining_info_p): Update for conversion o
	optimization_records_enabled_p to a member function of
	dump_context.
	* optinfo.h (optinfo_enabled_p): Delete, in favor of
	dump_context::optinfo_enabled_p.
	(optinfo::emit): Delete, in favor of dump_context::emit_optinfo.
	* toplev.c: Include "dump-context.h".
	(compile_file): Replace call to optimization_records_finish with
	dump_context::finish_any_json_writer.
	(do_compile): Replace call to optimization_records_start with
	conditionally creating a optrecord_json_writer for the
	dump_context.

From-SVN: r266279

re PR libstdc++/87855 (std::optional<T> only copy-constructible if T is trivially copy-constructible)

PR libstdc++/87855

Also implement P0602R4 (variant and optional
should propagate copy/move triviality) for std::optional.
* include/std/optional (_Optional_payload): Change
the main constraints to check constructibility in
addition to assignability.
(operator=): Make constexpr.
(_M_reset): Likewise.
(_M_construct): Likewise.
(operator->): Likewise.
* testsuite/20_util/optional/assignment/8.cc: Adjust.
* testsuite/20_util/optional/assignment/9.cc: New.

From-SVN: r266278

2018-11-19  Martin Liska  <mliska@suse.cz>

	PR lto/88077
	* lto-symtab.c (lto_symtab_merge): Transform the
	condition before r256989.
2018-11-19  Martin Liska  <mliska@suse.cz>

	PR lto/88077
	* gcc.dg/lto/pr88077_0.c: New test.
	* gcc.dg/lto/pr88077_1.c: New test.

From-SVN: r266277

	PR tree-optimization/88071
	* tree-vect-loop.c (vectorize_fold_left_reduction): Pass true instead
	of false as last argument to gsi_remove.
	* tree-vect-stmts.c (vect_finish_replace_stmt): Pass true instead of
	false as last argument to gsi_replace.

	* gcc.dg/pr88071.c: New test.

From-SVN: r266276

	PR c++/60994
	* g++.dg/lookup/pr60994.C: New test.

From-SVN: r266275

	PR debug/87039
	* omp-expand.c: Don't include debug.h.
	(adjust_context_and_scope): Add REGION argument.  Find DECL_CONTEXT
	from innermost outer parallel, task, teams or target that has a
	child_fn set, or, if there is no such outer region, use
	current_function_decl.  Do the DECL_CONTEXT adjustment regardless of
	whether a suitable BLOCK is found or not.
	(expand_parallel_call, expand_teams_call): Don't call
	adjust_context_and_scope here.
	(grid_expand_target_grid_body): Revert 2017-01-25 changes.
	(expand_omp_taskreg, expand_omp_target): Likewise.  Call
	adjust_context_and_scope.
	* dwarf2out.c (dwarf2out_early_global_decl): For
	decl_function_context recurse instead of calling dwarf2out_decl.

	* g++.dg/gomp/pr78363-4.C: New test.
	* g++.dg/gomp/pr78363-5.C: New test.
	* g++.dg/gomp/pr78363-6.C: New test.
	* g++.dg/gomp/pr78363-7.C: New test.

From-SVN: r266272

2018-11-19  Richard Biener  <rguenther@suse.de>

	PR lto/87229
	* tree.c (free_lang_data_in_one_sizepos): Free non-gimple-val
	sizepos values.

	* g++.dg/lto/pr87229_0.C: New testcase.

From-SVN: r266271

2018-11-19  Martin Liska  <mliska@suse.cz>

	* g++.dg/gcov/pr84548.C: Remove remove-gcda.
	* g++.dg/gcov/ternary.C: Likewise.
	* lib/gcov.exp: Support pattern of following form:
	count(1*).

From-SVN: r266270

	* include/std/string_view (basic_string_view::copy): Use traits to
	copy.
	* testsuite/21_strings/basic_string_view/operations/copy/char/2.cc:
	New test.
	* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/2.cc:
	New test.

From-SVN: r266269

	* compare-elim.c (struct comparison): Add not_in_a field.
	(is_not): New static function.
	(strip_not): Likewise.
	(conforming_compare): Handle a NOT in the first operand.
	(can_eliminate_compare): Likewise.
	(find_comparison_dom_walker::before_dom_children): Likewise.
	(try_eliminate_compare): Likewise.
	* config/visium/visium.md (negsi2_insn_set_carry): Turn into...
	(neg<mode>2_insn_set_carry): ...this and add missing NEG operation.

From-SVN: r266268

	* doc/extend.texi (Common Type Attributes): Fix typos.

From-SVN: r266267

From-SVN: r266266

From-SVN: r266265

decl2.c (grokfield): Remove obsolete _vptr check; fix explicit template argument list error location.

/cp
2018-11-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl2.c (grokfield): Remove obsolete _vptr check; fix
	explicit template argument list error location.

/testsuite
2018-11-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/template/crash91.C: Check location too.

From-SVN: r266264

2018-11-19  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/88045
	* coverage.c (coverage_begin_function): Add assert.
2018-11-19  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/88045
	* g++.dg/gcov/pr88045.C: New test.

From-SVN: r266262

2018-11-19  Martin Liska  <mliska@suse.cz>

	* check_GNU_style_lib.py: Detect mixed usage
	of spaces and tabs.

From-SVN: r266261

2018-11-18  Sandra Loosemore  <sandra@codesourcery.com>

	PR other/40498

	gcc/
	* doc/extend.texi (Common Function Attributes): Document that
	no_instrument_function applies to -p and -pg, too.
	* doc/invoke.texi (Instrumentation Options): Add cross-references
	to docs for -p, -pg, and -finstrument-functions.

From-SVN: r266260

From-SVN: r266259

libphobos/ChangeLog:

2018-11-19  Iain Buclaw  <ibuclaw@gdcproject.org>

	* src/Makefile.am: Remove std.internal.digest.sha_SSSE3 and
	std.internal.math.biguintx86 modules.
	* src/Makefile.in: Rebuild.
	* src/std/internal/digest/sha_SSSE3.d: Remove.
	* src/std/internal/math/biguintx86.d: Remove.

From-SVN: r266256

2018-11-16  Michele Pezzutti <mpezz@tiscali.it>
	    Edward Smith-Rowland  <3dw4rd@verizon.net>

	PR libstdc++/83566 - cyl_bessel_j returns wrong result for x>1000
	for high orders.
	* include/tr1/bessel_function.tcc: Perform no fewer than nu/2 iterations
	of the asymptotic series (nu is the Bessel order).
	* testsuite/tr1/5_numerical_facilities/special_functions/
	09_cyl_bessel_j/check_value.cc: Add tests at nu=100, 1000<=x<=2000.
	* testsuite/tr1/5_numerical_facilities/special_functions/	
	11_cyl_neumann/check_value.cc: Ditto.
	* testsuite/special_functions/08_cyl_bessel_j/check_value.cc: Ditto.
	* testsuite/special_functions/10_cyl_neumann/check_value.cc: Ditto.


Co-Authored-By: Edward Smith-Rowland <3dw4rd@verizon.net>

From-SVN: r266252

2018-11-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/88073
	* frontend-passes.c (combine_array_constructor): Do not do
	anything if in a WHERE statement.

2018-11-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/88073
	* gfortran.dg/where_7.f90: New test.

From-SVN: r266251

Also give target access to the gnu-user.h LINK_GCC_C_SEQUENCE_SPEC.

	* config/gnu-user.h (GNU_USER_TARGET_CRTI): Define.
	(GNU_USER_TARGET_STARTFILE_SPEC): Use it here.
	(GNU_USER_TARGET_CRTN): Define.
	(GNU_USER_TARGET_ENDFILE_SPEC): Use it here.
	(GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC): Define.

From-SVN: r266250

The HAVE_LD_PIE variant doesn't contain anything that will break
linking when !HAVE_LD_PIE that isn't already broken if you choose to
build PIEs with a linker that doesn't support PIE.  All this
HAVE_LD_PIE protects is the choice of different crt files, which is
more about libc capability than linker capability.

	* config/gnu-user.h (GNU_USER_TARGET_STARTFILE_SPEC): Delete
	!HAVE_LD_PIE variant.
	(GNU_USER_TARGET_ENDFILE_SPEC): Likewise.

From-SVN: r266249

2018-11-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

    PR fortran/70260
    * expr.c (gfc_check_assign): Reject assigning to an external
    symbol.
    (gfc_check_pointer_assign): Add suppress_type_test
    argument. Insert line after if. A non-proc pointer can not point
    to a constant.  Only check types if suppress_type_test is false.
    * gfortran.h (gfc_check_pointer_assign): Add optional
    suppress_type_test argument.
    * resolve.c (gfc_resolve_code):  Move up gfc_check_pointer_assign
    and give it the extra argument.
    (resolve_fl_procedure): Set error on value for a function with
    an inizializer.

2018-11-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

    PR fortran/70260
    * gfortran.dg/proc_ptr_result_5.f90:  Add dg-error directive.
    * gfortran.dg/protected_4.f90: Split line to allow for extra error.
    * gfortran.dg/protected_6.f90: Likewise.
    * gfortran.dg/assign_11.f90: New test.
    * gfortran.dg/pointer_assign_12.f90: New test.

From-SVN: r266248

From-SVN: r266247

2018-11-17  Eric Gallager  <egallager@gcc.gnu.org>
	    Sandra Loosemore  <sandra@codesourcery.com>

	PR driver/31357

	gcc/
	* doc/invoke.texi (Overall Options): Document that --help and 
	--help=<value> options cannot be combined.

Co-Authored-By: Sandra Loosemore <sandra@codesourcery.com>

From-SVN: r266246

From-SVN: r266245

Define the thread-safe pool resource, using a shared_mutex to allow
multiple threads to concurrently allocate from thread-specific pools.

Define new weak symbols for the pthread_rwlock_t functions, to avoid
making libstdc++.so depend on libpthread.so

When the necessary Gthread support is absent only define the
feature-test macro to 1, rather than 201603. This is intended to imply
incomplete support, because everything except synchronized_pool_resource
works.

	Implement std::pmr::synchronized_pool_resource
	* config/abi/pre/gnu.ver: Add new symbols.
	* include/std/memory_resource [_GLIBCXX_HAS_GTHREADS]
	(__cpp_lib_memory_resource): Define to expected value, 201603.
	(synchronized_pool_resource): New class.
	[!_GLIBCXX_HAS_GTHREADS] (__cpp_lib_memory_resource): Define to 1.
	* include/std/shared_mutex (__glibcxx_rwlock_rdlock)
	(__glibcxx_rwlock_tryrdlock, __glibcxx_rwlock_wrlock)
	(__glibcxx_rwlock_trywrlock, __glibcxx_rwlock_unlock)
	(__glibcxx_rwlock_destroy, __glibcxx_rwlock_init)
	(__glibcxx_rwlock_timedrdlock, __glibcxx_rwlock_timedwrlock): Define
	weak symbols for POSIX rwlock functions.
	(__shared_mutex_pthread): Use weak symbols.
	* include/std/version (__cpp_lib_memory_resource): Define.
	* src/c++17/memory_resource.cc [_GLIBCXX_HAS_GTHREADS]
	(synchronized_pool_resource::_TPools): New class.
	(destroy_TPools): New function for pthread_key_create destructor.
	(synchronized_pool_resource::synchronized_pool_resource)
	(synchronized_pool_resource::~synchronized_pool_resource)
	(synchronized_pool_resource::release)
	(synchronized_pool_resource::do_allocate)
	(synchronized_pool_resource::do_deallocate): Define public members.
	(synchronized_pool_resource::_M_thread_specific_pools)
	(synchronized_pool_resource::_M_alloc_tpools)
	(synchronized_pool_resource::_M_alloc_shared_tpools): Define private
	members.
	* testsuite/20_util/synchronized_pool_resource/allocate.cc: New test.
	* testsuite/20_util/synchronized_pool_resource/cons.cc: New test.
	* testsuite/20_util/synchronized_pool_resource/is_equal.cc: New test.
	* testsuite/20_util/synchronized_pool_resource/multithreaded.cc: New
	test.
	* testsuite/20_util/synchronized_pool_resource/release.cc: New test.
	* testsuite/performance/20_util/memory_resource/pools.cc: Add
	multithreaded tests using pmr::synchronized_pool_resource.

From-SVN: r266242

	gcc/
	* config/riscv/riscv.c (epilogue_cfa_sp_offset): New.
	(riscv_restore_reg): If restoring HARD_FRAME_POINTER_REGNUM, and
	epilogue_cfa_sp_offset set, then add REG_CFA_DEF_CFA regnote.
	(riscv_expand_epilogue): Initialize epilogue_cfa_sp_offset.  Set it
	to step2 if frame_pointer_needed and step1 is 0.

From-SVN: r266241

2018-11-17  Sandra Loosemore  <sandra@codesourcery.com>

	PR c++/4225

	gcc/
	* doc/cpp.texi (System Headers): Add note about implicit
	extern "C" block on targets that define SYSTEM_IMPLICIT_EXTERN_C.

From-SVN: r266240

2018-11-17  Sandra Loosemore  <sandra@codesourcery.com>

	PR c++/4025

	gcc/
	* doc/invoke.texi (C++ Dialect Options): Clarify usage of
	-fno-implicit-templates.

From-SVN: r266239

Backport from upstream phobos 2.079 for AArch64.

Reviewed-on: https://github.com/dlang/phobos/pull/5965

From-SVN: r266238

	PR tree-optimization/87546
	* tree-vect-patterns.c (vect_look_through_possible_promotion): Add
	min_precision variable, initially set it to orig_precision, only does
	something if op_type's precision is <= min_precision and update
	min_precision whenever calling set_op.

	* gcc.dg/vect/O3-pr87546.c: New test.

From-SVN: r266237

	PR rtl-optimization/88018
	* cfgrtl.c (fixup_abnormal_edges): Guard moving insns to fallthru edge
	on the presence of fallthru edge, rather than if it is a USE or not.

	* g++.dg/tsan/pr88018.C: New test.

From-SVN: r266236

re PR ipa/87957 (ICE tree check: expected tree that contains ‘decl minimal’ structure, have ‘identifier_node’ in warn_odr, at ipa-devirt.c:1051 since r265519)

	PR ipa/87957
	* ipa-devirt.c (warn_odr): Look for main variant to get TYPE_DECL.

From-SVN: r266235

The D language expects the value to be the minimum alignment required
for the type, not the preferred alignment.

gcc/d/ChangeLog:

2018-11-17  Iain Buclaw  <ibuclaw@gdcproject.org>

	PR d/87824
	* d-target.cc (Target::alignsize): Return min_align_of_type.

From-SVN: r266234

2018-11-16  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi (Option Summary): Fix whitespace and line
	breaks in @gccoptlist environments.
	(Warning Options): Likewise.
	(Optimize Options): Likewise.
	(PowerPC SPE Options): Likewise.
	(RS/6000 and PowerPC Options): Likewise.

From-SVN: r266233

	* config/mn10300/mn10300.md (adddi3_degenerate): Remove bogus
	gcc_assert.

From-SVN: r266232

2018-11-16  Sandra Loosemore  <sandra@codesourcery.com>

	PR middle-end/23197

	gcc/
	* doc/invoke.texi (Optimize Options): Update options enabled by
	fprofile-generate, -fprofile-use, and -fauto-profile.

From-SVN: r266231

2018-11-17  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	PR middle-end/87854
	* g++.dg/parse/concat1.C: Add dg-error for targets with size_t < 32
	bits. Update comment.
	* gcc.dg/concat2.c: Likewise.
	* gcc.c-torture/compile/pr46534.c: Likewise.

From-SVN: r266230