The .note.GNU-stack section tells the linker that this object does not
    require an executable stack.
    
    The .note.GNU-split-stack section tells the linker that functions in
    this object can be called directly by split-stack functions, without
    require a large stack.
    
    The .note.GNU-no-split-stack section tells the linker that functions
    in this object do not have a split-stack prologue.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/198440

From-SVN: r276488

While looking at concepts caching I noticed that we were clearing the caches
unnecessarily for non-constant initialization, which shouldn't affect
folding.

	* typeck2.c (store_init_value): Only clear_cv_and_fold_caches if the
	value is constant.

From-SVN: r276487

gcc/
	* hash-map.h (default_hash_map_size): New variable.
	(create_ggc): Use it as default argument.
	(hash_map_maybe_create, hash_map_safe_get)
	(hash_map_safe_get_or_insert, hash_map_safe_put): New fns.
gcc/cp/
	* constexpr.c (maybe_initialize_fundef_copies_table): Remove.
	(get_fundef_copy): Use hash_map_safe_get_or_insert.
	* cp-objcp-common.c (cp_get_debug_type): Use hash_map_safe_*.
	* decl.c (store_decomp_type): Remove.
	(cp_finish_decomp): Use hash_map_safe_put.
	* init.c (get_nsdmi): Use hash_map_safe_*.
	* pt.c (store_defaulted_ttp, lookup_defaulted_ttp): Remove.
	(add_defaults_to_ttp): Use hash_map_safe_*.

From-SVN: r276484

2019-10-02  Andreas Tobler  <andreast@gcc.gnu.org>

	* testsuite/libgomp.oacc-c-c++-common/loop-default.h: Remove alloca.h
	include. Replace alloca () with __builtin_alloca ().
	* testsuite/libgomp.oacc-c-c++-common/loop-dim-default.c: Likewise.

Reviewed-by: Thomas Schwinge <thomas@codesourcery.com>

From-SVN: r276479

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91784
	* simplify.c (gfc_convert_constant): Simplify expression if the
	expres	ion type is EXPR_OP.

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91784
	* gfortran.dg/pr91784.f90: New test.

From-SVN: r276474

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91785
	* primary.c (gfc_match_varspec): Ensure an inquiry parameter has
	it locus set.

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91785
	* gfortran.dg/pr91785.f90: New test.

From-SVN: r276473

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91942
	* io.c (match_vtag): Check for non-NULL result->symtree.
	(match_out_tag): Check for invalid constant due to inquiry parameter.
	(match_filepos): Instead of a syntax error, go to cleanup to get better
	error messages.

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91942
	* gfortran.dg/pr91587.f90: Update dg-error regex.
	* gfortran.dg/pr91942.f90: New test.

From-SVN: r276472

2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91943
	* match.c (gfc_match_call): BOZ cannot be an actual argument in
	a subroutine reference.
	* resolve.c (resolve_function): BOZ cannot be an actual argument in
	a function reference.
 
2019-10-02  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91943
	gfortran.dg/pr91943.f90

From-SVN: r276471

	* cif-code.def (MAX_INLINE_INSNS_SINGLE_O2_LIMIT,
	MAX_INLINE_INSNS_AUTO_O2_LIMIT): New.
	* ipa-inline.c (inline_insns_single, inline_insns_auto): New functions.
	(can_inline_edge_by_limits_p): Use it.
	(big_speedup_p): Use PARAM_INLINE_MIN_SPEEDUP_O2.
	(want_inline_small_function_p): Use O2 bounds.
	(edge_badness): LIkewise.
	* opts.c (default_options): Add OPT_finline_functions.
	* params.def (PARAM_INLINE_MIN_SPEEDUP_O2,
	PARAM_MAX_INLINE_INSNS_SINGLE_O2, PARAM_MAX_INLINE_INSNS_AUTO_O2):
	New parameters.

	* g++.dg/tree-ssa/pr53844.C: Add -fno-inline-functions --param
	max-inline-insns-single-O2=200.
	* gcc.c-torture/execute/builtins/builtins.exp: Add
	-fno-inline-functions to additional_flags.
	* gcc.dg/ipa/inline-7.c: Add -fno-inline-functions.
	* gcc.dg/optimize-bswapsi-5.c: Add -fno-inline-functions.
	* gcc.dg/tree-ssa/ssa-thread-12.c: Add --param
	early-inlining-insns-O2=14 -fno-inline-functions; revert previous
	change.
	* gcc.dg/winline-3.c: Use --param max-inline-insns-single-O2=1
	--param inline-min-speedup-O2=100
	instead of --param max-inline-insns-single=1 --param
	inline-min-speedup=100

	* invoke.texi (-finline-functions): Update documentation.
	(max-inline-insns-single-O2, max-inline-insns-auto-O2,
	inline-min-speedup-O2): Document.
	(early-inlining-insns-O2): Simplify docs.

From-SVN: r276470

	* cif-code.def (MAX_INLINE_INSNS_SINGLE_O2_LIMIT,
	MAX_INLINE_INSNS_AUTO_O2_LIMIT): New.
	* ipa-inline.c (inline_insns_single, inline_insns_auto): New functions.
	(can_inline_edge_by_limits_p): Use it.
	(big_speedup_p): Use PARAM_INLINE_MIN_SPEEDUP_O2.
	(want_inline_small_function_p): Use O2 bounds.
	(edge_badness): LIkewise.
	* opts.c (default_options): Add OPT_finline_functions.
	* params.def (PARAM_INLINE_MIN_SPEEDUP_O2,
	PARAM_MAX_INLINE_INSNS_SINGLE_O2, PARAM_MAX_INLINE_INSNS_AUTO_O2):
	New parameters.

	* g++.dg/tree-ssa/pr53844.C: Add -fno-inline-functions --param
	max-inline-insns-single-O2=200.
	* gcc.c-torture/execute/builtins/builtins.exp: Add
	-fno-inline-functions to additional_flags.
	* gcc.dg/ipa/inline-7.c: Add -fno-inline-functions.
	* gcc.dg/optimize-bswapsi-5.c: Add -fno-inline-functions.
	* gcc.dg/tree-ssa/ssa-thread-12.c: Add --param
	early-inlining-insns-O2=14 -fno-inline-functions; revert previous
	change.
	* gcc.dg/winline-3.c: Use --param max-inline-insns-single-O2=1
	--param inline-min-speedup-O2=100
	instead of --param max-inline-insns-single=1 --param
	inline-min-speedup=100

	* invoke.texi (-finline-functions): Update documentation.
	(max-inline-insns-single-O2, max-inline-insns-auto-O2,
	inline-min-speedup-O2): Document.
	(early-inlining-insns-O2): Simplify docs.

From-SVN: r276469

The only symbols matched by std::e[a-q]* and std::e[s-z]* that are
supposed to be in the GLIBCXX_3.4 version are std::exception::* and
std::endl and std::ends. The latter two already have explicit patterns
matching them, so we just need to match std::exception::*.

This change ensures that any new symbols with a return type of
std::enable_if<...> are not added to the GLIBCXX_3.4 version.

	* config/abi/pre/gnu.ver: Tighten up greedy wildcards.

From-SVN: r276468

	PR rtl-optimization/87047
	* ifcvt.c (average_cost): New static function.  Use it...
	(noce_process_if_block): ... here.

testsuite/
	* gcc.dg/pr87047.c: New test.

From-SVN: r276466

2019-10-02  Martin Jambor  <mjambor@suse.cz>

	PR testsuite/91842
	* gcc.dg/ipa/ipa-sra-19.c: Skip on powerpc.

From-SVN: r276465

	* module.c (load_commons): Initialize flags to 0 to silecne
	-Wmaybe-uninitialized warning.
	(read_module): Likewise for n and comp_name.

From-SVN: r276464

	* doc/xml/manual/parallel_mode.xml: Add caveat about support for
	recent standards.
	* doc/html/*: Regenerate.

From-SVN: r276463

2019-10-02  Aaron Sawdey <acsawdey@linux.ibm.com>

	* config/rs6000/rs6000-protos.h (expand_block_move): Change prototype.
	* config/rs6000/rs6000-string.c (expand_block_move): Add
	might_overlap parm.
	* config/rs6000/rs6000.md (movmemsi): Add new pattern.
	(cpymemsi): Add might_overlap parm to expand_block_move() call.

From-SVN: r276462

2019-10-02  Aaron Sawdey <acsawdey@linux.ibm.com>

	* builtins.c (expand_builtin_memory_copy_args): Add might_overlap parm.
	(expand_builtin_memcpy): Use might_overlap parm.
	(expand_builtin_mempcpy_args): Use might_overlap parm.
	(expand_builtin_memmove): Call expand_builtin_memory_copy_args.
	(expand_builtin_memory_copy_args): Add might_overlap parm.
	* expr.c (emit_block_move_via_cpymem): Rename to
	emit_block_move_via_pattern, add might_overlap parm, use cpymem
	or movmem optab as appropriate.
	(emit_block_move_hints): Add might_overlap parm, do the right
	thing for might_overlap==true.
	* expr.h (emit_block_move_hints): Update prototype.

From-SVN: r276461

	* tree-eh.h (unsplit_eh_edges): Declare.
	* tree-eh.c (maybe_remove_unreachable_handlers): Detect more cases.
	(unsplit_eh_edges): New function wrapping unsplit_all_eh.
	* gimple-ssa-store-merging.c: Include cfganal.h cfgcleanup.h except.h.
	(struct store_immediate_info): Add lp_nr field.
	(store_immediate_info::store_immediate_info): Add NR2 parameter and
	initialize lp_nr with it.
	(struct merged_store_group): Add lp_nr and only_constants fields.
	(merged_store_group::merged_store_group): Initialize them.
	(merged_store_group::can_be_merged_into): Deal with them.
	(pass_store_merging): Rename terminate_and_release_chain into
	terminate_and_process_chain.
	(pass_store_merging::terminate_and_process_all_chains): Adjust to above
	renaming and remove useless assertions.
	(pass_store_merging::terminate_all_aliasing_chains): Small tweak.
	(stmts_may_clobber_ref_p): Be prepared for different basic blocks.
	(imm_store_chain_info::coalesce_immediate_stores): Use only_constants
	instead of always recomputing it and compare lp_nr.
	(imm_store_chain_info::output_merged_store): If the group is in an
	active EH region, register new stores if they can throw.  Moreover,
	if the insertion has created new basic blocks, adjust the PHI nodes
	of the post landing pad.
	(imm_store_chain_info::output_merged_stores): If the original stores
	are in an active EH region, deregister them.
	(lhs_valid_for_store_merging_p): Prettify.
	(adjust_bit_pos): New function extracted from...
	(mem_valid_for_store_merging): ...here.  Use it for the base address
	and also for the offset if it is the addition of a constant.
	(lp_nr_for_store): New function.
	(pass_store_merging::process_store): Change return type to bool.
	Call lp_nr_for_store to initialize the store info.  Propagate the
	return status of various called functions to the return value.
	(store_valid_for_store_merging_p): New predicate.
	(enum basic_block_status): New enumeration.
	(get_status_for_store_merging): New function.
	(pass_store_merging::execute): If the function can throw and catch
	non-call exceptions, unsplit the EH edges on entry and clean up the
	CFG on exit if something changed.  Call get_status_for_store_merging
	for every basic block and keep the chains open across basic blocks
	when possible.  Terminate and process open chains at the end, if any.

From-SVN: r276459

2019-10-02  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* reginfo.c (globalize_reg): Fix shadowed variable in
	function_abis walk.

From-SVN: r276457

Jeff pointed out that gcc.target/mips/call-clobbered-4.c started
failing after the function-abi series.  This is because IRA used
to treat partly call-clobbered registers as hard conflicts and
so wouldn't consider them for -fcaller-saves.  Now that we treat
call clobbers the same way regardless of where they come from,
we can use $f21 as a caller-save register.  This in turn means
that -Os is no longer a special case in call-clobbered-3.c.

(The new code is the same size as the old code.)

2019-10-02  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
	* gcc.target/mips/call-clobbered-3.c: Remove skip for -Os.
	* gcc.target/mips/call-clobbered-4.c: Delete.

From-SVN: r276456

2019-10-02  Martin Jambor  <mjambor@suse.cz>

	* cgraph.c (symbol_table::create_edge): New parameter cloning_p,
	do not compute some stuff when set.
	(cgraph_node::create_edge): Likewise.
	(cgraph_node::create_indirect_edge): Renamed last parameter to
	coning_p and flipped its meaning, don't even calculate
	inline_failed when set.
	* cgraph.h (cgraph_node::create_edge): Add new parameter.
	(symbol_table::::create_edge): Likewise.
	(cgraph_node::create_indirect_edge): Rename last parameter, flip
	the default value.
	* cgraphclones.c (cgraph_edge::clone): Pass true cloning_p to all
	call graph edge creating functions.

From-SVN: r276455

re PR c++/91222 (507.cactuBSSN_r build fails in warn_types_mismatch at ipa-devirt.c:1006 since r273571)

	PR c++/91222
	* ipa-devirt.c (warn_types_mismatch): Fix conditional on anonymous
	namespace types.

From-SVN: r276454

This change makes sure that if the driver is invoked with
"-mcode-density" flag, then the assembler will receive it
too.

gcc/
xxxx-xx-xx  Shahab Vahedi  <shahab@synopsys.com>

        * config/arc/arc.h (ASM_SPEC): pass -mcode-density

From-SVN: r276453

2019-10-02  Richard Biener  <rguenther@suse.de>

	* tree-vectorizer.h (vect_transform_reduction): Declare.
	* tree-vect-stmts.c (vect_transform_stmt): Use it.
	* tree-vect-loop.c (vectorizable_reduction): Split out reduction
	stmt transform to ...
	(vect_transform_reduction): ... this.

From-SVN: r276452

        gcc/fortran/
	* dump-parse-tree.c (show_omp_clauses): Handle OMP_LIST_USE_DEVICE_ADDR.
	* gfortran.h (enum): Add OMP_LIST_USE_DEVICE_ADDR.
	* openmp.c (omp_mask1): Likewise.
	(gfc_match_omp_clauses): Match 'use_device_addr'.
	(OMP_TARGET_DATA_CLAUSES): Add OMP_LIST_USE_DEVICE_ADDR.
	(resolve_omp_clauses): Add it; add is_device_ptr checks.

        gcc/testsuite/
	* gfortran.dg/gomp/is_device_ptr-1.f90: New.

From-SVN: r276449

2019-10-02  Richard Biener  <rguenther@suse.de>

	PR c++/91606
	* decl.c (build_ptrmemfunc_type): Mark pointer-to-member
	fat pointer structure members as DECL_NONADDRESSABLE_P.

	* g++.dg/torture/pr91606.C: New testcase.

From-SVN: r276448

	gcc/fortran/
	* openmp.c (gfc_match_omp_clauses): Show a clause-parsing
	error if none was rised before.
	* parse.c (matcha, matcho): If error occurred after
	OpenMP/OpenACC directive matched, do not try other directives.

	gcc/testsuite/
	* gfortran.dg/goacc/asyncwait-1.f95: Handle new error message.
	* gfortran.dg/goacc/asyncwait-2.f95: Likewise
	* gfortran.dg/goacc/asyncwait-3.f95: Likewise
	* gfortran.dg/goacc/asyncwait-4.f95: Likewise
	* gfortran.dg/goacc/default-2.f: Likewise
	* gfortran.dg/goacc/enter-exit-data.f95: Likewise
	* gfortran.dg/goacc/if.f95: Likewise
	* gfortran.dg/goacc/list.f95: Likewise
	* gfortran.dg/goacc/literal.f95: Likewise
	* gfortran.dg/goacc/loop-2-kernels-tile.f: Likewise95
	* gfortran.dg/goacc/loop-2-parallel-tile.f95: Likewise
	* gfortran.dg/goacc/loop-7.f95: Likewise
	* gfortran.dg/goacc/parallel-kernels-cla: Likewiseuses.f95
	* gfortran.dg/goacc/routine-6.f90: Likewise
	* gfortran.dg/goacc/several-directives.f95: Likewise
	* gfortran.dg/goacc/sie.f95: Likewise
	* gfortran.dg/goacc/tile-1.f90: Likewise
	* gfortran.dg/goacc/update-if_present-2.: Likewisef90
	* gfortran.dg/gomp/declare-simd-1.f90: Likewise
	* gfortran.dg/gomp/pr29759.f90: Likewise

From-SVN: r276447

        * trans-openmp.c (gfc_omp_is_optional_argument): Fix coding
        style.

From-SVN: r276446

        gcc/
        * omp-low.c (lower_omp_target): Dereference optional argument
        to work with the right pointer.

        gcc/testsuite/
        * libgomp/testsuite/libgomp.fortran/use_device_ptr-optional-1.f90: New.

From-SVN: r276445

2019-10-02  Kwok Cheung Yeung  <kcy@codesourcery.com>

        gcc/fortran/
        * f95-lang.c (LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT): Define to
        gfc_omp_is_optional_argument.
        * trans-decl.c (create_function_arglist): Set
        GFC_DECL_OPTIONAL_ARGUMENT in the generated decl if the parameter is
        optional.
        * trans-openmp.c (gfc_omp_is_optional_argument): New.
        (gfc_omp_privatize_by_reference): Return true if the decl is an
        optional pass-by-reference argument.
        * trans.h (gfc_omp_is_optional_argument): New declaration.
        (lang_decl): Add new optional_arg field.
        (GFC_DECL_OPTIONAL_ARGUMENT): New macro.

        gcc/
        * langhooks-def.h (LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT): Default to
        false.
        (LANG_HOOKS_DECLS): Add LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT.
        * langhooks.h (omp_is_optional_argument): New hook.
        * omp-general.c (omp_is_optional_argument): New.
        * omp-general.h (omp_is_optional_argument): New declaration.
        * omp-low.c (lower_omp_target): Create temporary for received value
        and take the address for new_var if the original variable was a
        DECL_BY_REFERENCE.  Use size of referenced object when a
        pass-by-reference optional argument used as argument to firstprivate.

From-SVN: r276444

2019-10-02  Richard Biener  <rguenther@suse.de>

	* internal.h (enum include_type): Remove trailing comma.

From-SVN: r276443

	PR tree-optimization/91940
	* tree-vect-patterns.c: Include tree-vector-builder.h and
	vec-perm-indices.h.
	(vect_recog_rotate_pattern): Also handle __builtin_bswap16, either by
	unpromoting the argument back to uint16_t, or by converting into a
	rotate, or into shifts plus ior.

	* gcc.dg/vect/vect-bswap16.c: Add -msse4 on x86, run on all targets,
	expect vectorized 1 loops message on both vect_bswap and sse4_runtime
	targets.
	* gcc.dg/vect/vect-bswap16a.c: New test.

From-SVN: r276442

2019-10-02  Richard Biener  <rguenther@suse.de>

	* tree-vectorizer.h (stmt_vec_info_type::cycle_phi_info_type):
	New.
	(vect_transform_cycle_phi): Declare.
	* tree-vect-stmts.c (vect_transform_stmt): Call
	vect_transform_cycle_phi.
	* tree-vect-loop.c (vectorizable_reduction): Split out
	PHI transformation stage to ...
	(vect_transform_cycle_phi): ... here.

From-SVN: r276441

One effect of https://gcc.gnu.org/ml/gcc-patches/2019-09/msg00802.html
was to strengthen the sanity check in lra_assigns so that it checks
whether reg_renumber is consistent with the whole conflict set.
This duly tripped on csky for a pseudo that had been allocated
to the eliminated frame pointer.  (csky doesn't have a separate
hard frame pointer.)

lra-lives uses:

/* Set of hard regs (except eliminable ones) currently live.  */
static HARD_REG_SET hard_regs_live;

to track the set of live directly-referenced hard registers, and it
correctly implements the exclusion when setting up the initial set:

  hard_regs_live &= ~eliminable_regset;

But later calls to make_hard_regno_live and make_hard_regno_dead
would process eliminable registers like other registers, recording
conflicts for them and potentially making them live.  (Note that
after r266086, make_hard_regno_dead adds conflicts for registers
that are already marked dead.)  I think this would have had the
effect of pessimising targets without a separate hard frame pointer.

2019-10-02  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR middle-end/91957
	* lra-lives.c (make_hard_regno_dead): Don't record conflicts for
	eliminable registers.
	(make_hard_regno_live): Likewise, and don't make them live.

From-SVN: r276440

2019-10-01  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/91593
	* io/read.c (read_decimal): Cast constant to size_t to turn off
	a bogus warning.
	* io/write.c (btoa_big): Use memset in lieu of setting the null
	byte in a string buffer to turn off a bogus warning.

From-SVN: r276439

From-SVN: r276438

As part of adding [[]]-style attributes, C2x adds the token :: for use
in scoped attribute names.

This patch adds corresponding support for that token in C to GCC.  The
token is supported both for C2x and for older gnu* standards (on the
basis that extensions are normally supported in older gnu* versions;
people will expect to be able to use [[]] attributes, before C2x is
the default, without needing to use -std=gnu2x).

There are no cases in older C standards where the token : can be
followed by a token starting with : in syntactically valid sources;
the only cases the :: token could break in older standard C thus are
ones involving concatenation of pp-tokens where the result does not
end up as tokens (e.g., gets stringized).  In GNU C extensions, the
main case where :: might appear in existing sources is in asm
statements, and the C parser is thus made to handle it like two
consecutive : tokens, which the C++ parser already does.  A limited
test of various positionings of :: in asm statements is added to the
testsuite (in particular, to cover the syntax error when :: means too
many colons but a single : would be OK), but existing tests cover a
variety of styles there anyway.

Technically there are cases in Objective-C and OpenMP for which this
also changes how previously valid code is lexed: the objc-selector-arg
syntax allows multiple consecutive : tokens (although I don't think
they are particularly useful there), while OpenMP syntax includes
array section syntax such as [:] which, before :: was a token, could
also be written as [::> (there might be other OpenMP cases potentially
affected, I didn't check all the OpenMP syntax in detail).  I don't
think either of those cases affects the basis for supporting the ::
token in all -std=gnu* modes, or that there is any obvious need to
special-case handling of CPP_SCOPE tokens for those constructs the way
there is for asm statements.

cpp_avoid_paste, which determines when spaces need adding between
tokens in preprocessed output where there wouldn't otherwise be
whitespace between them (e.g. if stringized), already inserts space
between : and : unconditionally, rather than only for C++, so no
change is needed there (but a C2x test is added that such space is
indeed inserted).

Bootstrapped with no regressions on x86-64-pc-linux-gnu.

gcc/c:
	* c-parser.c (c_parser_asm_statement): Handle CPP_SCOPE like two
	CPP_COLON tokens.

gcc/testsuite:
	* gcc.dg/asm-scope-1.c, gcc.dg/cpp/c11-scope-1.c,
	gcc.dg/cpp/c17-scope-1.c, gcc.dg/cpp/c2x-scope-1.c,
	gcc.dg/cpp/c2x-scope-2.c, gcc.dg/cpp/c90-scope-1.c,
	gcc.dg/cpp/c94-scope-1.c, gcc.dg/cpp/c99-scope-1.c,
	gcc.dg/cpp/gnu11-scope-1.c, gcc.dg/cpp/gnu17-scope-1.c,
	gcc.dg/cpp/gnu89-scope-1.c, gcc.dg/cpp/gnu99-scope-1.c: New tests.

libcpp:
	* include/cpplib.h (struct cpp_options): Add member scope.
	* init.c (struct lang_flags, lang_defaults): Likewise.
	(cpp_set_lang): Set scope member of pfile.
	* lex.c (_cpp_lex_direct): Test CPP_OPTION (pfile, scope) not
	CPP_OPTION (pfile, cplusplus) for creating CPP_SCOPE tokens.

From-SVN: r276434

Previously, diagnostic_show_locus saved and restored the pretty_printer's
prefix, clearing it for the duration of the call.

I have a patch kit in development that can benefit from applying a prefix
to the output of d_s_l, so this patch adds support to d_s_l for printing
such prefixes.

It moves the save and restore of the pp's prefix from d_s_l to all of its
callers, and updates diagnostic-show-locus.c to properly handle prefixes.

gcc/c-family/ChangeLog:
	* c-opts.c (c_diagnostic_finalizer): Temporarily clear prefix when
	calling diagnostic_show_locus, rather than destroying it afterwards.

gcc/ChangeLog:
	* diagnostic-show-locus.c (layout::print_gap_in_line_numbering):
	Call pp_emit_prefix.
	(layout::print_source_line): Likewise.
	(layout::start_annotation_line): Likewise.
	(diagnostic_show_locus): Remove call to temporarily clear the
	prefix.
	(selftest::test_one_liner_fixit_remove): Add test coverage for the
	interaction of pp_set_prefix with rulers and fix-it hints.
	* diagnostic.c (default_diagnostic_finalizer): Temporarily clear
	prefix when calling diagnostic_show_locus, rather than destroying
	it afterwards.
	(print_parseable_fixits): Temporarily clear prefix.
	* pretty-print.c (pp_format): Save and restore line_length, rather
	than assuming it is zero.
	(pp_output_formatted_text): Remove assertion that line_length is
	zero.

gcc/fortran/ChangeLog:
	* error.c (gfc_diagnostic_starter): Clear the prefix before
	calling diagnostic_show_locus.

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/diagnostic_group_plugin.c (test_begin_group_cb):
	Clear the prefix before emitting the "END GROUP" line.
	* gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
	(custom_diagnostic_finalizer): Temporarily clear prefix when
	calling diagnostic_show_locus, rather than destroying it
	afterwards.

From-SVN: r276433

	* include/experimental/algorithm (experimental::sample): Qualify call
	to __sample correctly.
	* include/parallel/algo.h (sample, for_each_n): Add using-declarations
	for algorithms that don't have parallel implementations.

From-SVN: r276432

This makes the __parallel::equal and __parallel:lexicographical_compare
algorithms usable in constant expressions, by dispatching to the
sequential algorithm when calling during constant evaluation.

	* include/parallel/algobase.h (equal, lexicographical_compare): Add
	_GLIBCXX20_CONSTEXPR and dispatch to sequential algorithm when being
	constant evaluated.
	* include/parallel/algorithmfwd.h (equal, lexicographical_compare):
	Add _GLIBCXX20_CONSTEXPR.

From-SVN: r276431