2018-11-28  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement uniform container erasure for C++20.
	* include/Makefile.am: Move erase_if.h.
	* include/Makefile.in: Move erase_if.h.
	* include/experimental/bits/erase_if.h: Move ...
	* include/bits/erase_if.h: ... here.
	* include/experimental/map: Move erase_if.h.
	* include/experimental/set: Move erase_if.h.
	* include/experimental/unordered_map: Move erase_if.h.
	* include/experimental/unordered_set: Move erase_if.h.
	* include/std/deque (erase_if, erase): New functions.
	* include/std/forward_list: Ditto.
	* include/std/list: Ditto.
	* include/std/map: Ditto.
	* include/std/set: Ditto.
	* include/std/string: Ditto.
	* include/std/unordered_map: Ditto.
	* include/std/unordered_set: Ditto.
	* include/std/vector: Ditto.
	* testsuite/21_strings/basic_string/erasure.cc: New test.
	* testsuite/23_containers/deque/erasure.cc: New test.
	* testsuite/23_containers/forward_list/erasure.cc: New test.
	* testsuite/23_containers/list/erasure.cc: New test.
	* testsuite/23_containers/map/erasure.cc: New test.
	* testsuite/23_containers/set/erasure.cc: New test.
	* testsuite/23_containers/unordered_map/erasure.cc: New test.
	* testsuite/23_containers/unordered_set/erasure.cc: New test.
	* testsuite/23_containers/vector/erasure.cc: New test.

From-SVN: r266567

Add fix for "path::lexically_relative is confused by trailing slashes".

	* doc/xml/manual/intro.xml: Document LWG 3096 change.
	* src/filesystem/std-path.cc (path::lexically_relative(const path&)):
	Treat a final empty element equivalently to a final dot element.
	* testsuite/27_io/filesystem/path/generation/relative.cc: Add checks
	for the examples in the DR.

From-SVN: r266566

The class API provides no way to modify the members, so we can share
them between copies of the same object. Copying becomes a simple
reference count update, which doesn't throw.

Also adjust the what() string to allow distinguishing between an empty
path passed to the constructor, and no path.

	PR libstdc++/83306
	* include/bits/fs_path.h (filesystem_error): Move data members into
	pimpl class owned by shared_ptr. Remove inline definitions of member
	functions.
	* src/filesystem/std-path.cc (filesystem_error::_Impl): Define.
	(filesystem_error): Define member functions.
	* testsuite/27_io/filesystem/filesystem_error/cons.cc: New test.
	* testsuite/27_io/filesystem/filesystem_error/copy.cc: New test.

From-SVN: r266565

From-SVN: r266563

If the allocation of abbrevs->abbrevs in read_abbrevs fails, then
abbrevs->num_abbrevs remains nonzero, and consequently free_abbrevs will
segfault when accessing abbrevs->abbrevs.

Fix this by setting abbrevs->num_abbrevs only after abbrevs->abbrevs
allocation has succeeded.

Bootstrapped and reg-tested on x86_64.

2018-11-28  Tom de Vries  <tdevries@suse.de>

	* dwarf.c (read_abbrevs): Fix handling of abbrevs->abbrevs allocation
	failure.

From-SVN: r266562

2018-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88223
	* tree-ssa-sccvn.c (vn_reference_lookup_3): When skipping
	over a stored-same value may-alias store make sure to consider
	partial overlaps which are valid when TBAA reasonings do not
	apply and byte-granular overlaps are possible at all.

	* gcc.dg/torture/pr88223.c: New testcase.

From-SVN: r266560

	* doc/xml/manual/status_cxx2017.xml: Update C++17 status.
	* doc/html/*: Regenerate.

From-SVN: r266559

re PR tree-optimization/88217 (Compile time and memory hog w/ -O2 -fstrict-enums -fno-tree-forwprop -fno-tree-fre)

2018-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88217
	* vr-values.c (vr_values::extract_range_from_phi_node): Make
	sure to handle results > +INF and < -INF correctly when
	trying to drop down to +INF - 1 or -INF + 1.

	* g++.dg/pr88217.C: New testcase.

From-SVN: r266557

git commit 41f70262f (svn rev 264868) exposed a signed/unsigned
comparison.  Fixed by matching the type of the local var to that of
the tree field.

	* xcoffout.c (do_block): Signed/unsigned warning fix.

From-SVN: r266555

	PR testsuite/85368
	* gcc.dg/tree-ssa/phi-opt-11.c: For branch_cost targets, expect 0 ifs
	rather than 0 or 2 depending on logical_op_short_circuit.

From-SVN: r266552

2018-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79351
	* tree-ssa-sccvn.c (vn_reference_lookup_3): For assignments from
	empty CONSTRUCTORs ensure the store is at a constant position.

	* gcc.dg/torture/pr79351.c: New testcase.

From-SVN: r266551

re PR fortran/88229 (ICE tree check: expected integer_cst, have nop_expr in get_len, at tree.h:5608)

2018-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88229
	* tree-ssa.c (non_rewritable_mem_ref_base): Check DECL_SIZE_UNIT
	is an INTEGER_CST before accessing it so.

From-SVN: r266550

gcc/ChangeLog:

2018-11-28  Sam Tebbs  <sam.tebbs@arm.com>

	* doc/invoke.texi (-mtune=): Remove obsolete CPU names.

From-SVN: r266549

	PR target/88189
	* config/i386/i386.c (ix86_expand_sse_movcc): Handle DFmode and
	SFmode using sse4_1_blendvs[sd] with TARGET_SSE4_1.  Formatting fixes.
	* config/i386/sse.md (sse4_1_blendv<ssemodesuffix>): New pattern.

	* gcc.target/i386/sse4_1-pr88189-1.c: New test.
	* gcc.target/i386/sse4_1-pr88189-2.c: New test.
	* gcc.target/i386/avx-pr88189-1.c: New test.
	* gcc.target/i386/avx-pr88189-2.c: New test.

From-SVN: r266548

	PR c++/87476
	* typeck2.c (digest_init_r): Re-add handing of signed/unsigned char
	strings and add it to the initialization of wide array from non-wide
	string diagnostics too.

	* g++.dg/cpp0x/pr87476-1.C: New test.
	* g++.dg/cpp0x/pr87476-2.C: New test.

From-SVN: r266547

	PR c++/88215
	* c-ubsan.c: Include langhooks.h.
	(ubsan_instrument_division): Change gcc_assert that main variants
	of op0 and op1 types are equal to gcc_checking_assert that the
	main variants are compatible types.

	* c-c++-common/ubsan/pr88215.c: New test.

From-SVN: r266546

2018-10-19  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88182
	* g++.dg/gomp/pr88182.C: Move from libgomp and use -fopenmp-simd.

	* testsuite/libgomp.c++/pr88182.C: Move to g++.dg/gomp.

From-SVN: r266545

2018-11-28  Johannes Pfau  <johannespfau@gmail.com>

	* MAINTAINERS (Write After Approval): Add myself.

From-SVN: r266544

From-SVN: r266540

	PR c++/88187
	* decl.c (grokdeclarator): Don't diagnose deduction guide errors
	if !funcdecl_p.

	* g++.dg/other/pr88187.C: New test.

From-SVN: r266537

    
    Track whether we've seen an error when importing a function; we will
    use error tracking to avoid knock-on errors.
    
    Stop importing identifiers at a ')'.
    
    Provide a way to adjust the indentation level while importing.
    
    Reviewed-on: https://go-review.googlesource.com/c/150072

From-SVN: r266536

	* testsuite/27_io/filesystem/operations/canonical.cc: Remove
	directory created by test.
	* testsuite/27_io/filesystem/operations/symlink_status.cc: Remove
	symlink created by test.

From-SVN: r266535

    
    Inlinable function bodies are generated after the determine_types pass,
    so we know the type for all constants.  Rather than try to determine
    it again when inlining, record the type in the export data, using a
    $convert expression.  Reduce the number of explicit $convert
    expressions by recording a type context with the expected type in
    cases where that type is known.
    
    Reviewed-on: https://go-review.googlesource.com/c/150071

From-SVN: r266534

This resolves a longstanding issue where the lock policy for shared_ptr
reference counting depends on compilation options when the header is
included, so that different -march options can cause ABI changes. For
example, objects compiled with -march=armv7 will use atomics to
synchronize reference counts, and objects compiled with -march=armv5t
will use a mutex. That means the shared_ptr control block will have a
different layout in different objects, causing ODR violations and
undefined behaviour. This was the root cause of PR libstdc++/42734 as
well as PR libstdc++/67843.

The solution is to decide on the lock policy at build time, when
libstdc++ is configured. The configure script checks for the
availability of the necessary atomic built-ins for the target and fixes
that choice permanently. Different -march flags used to compile user
code will not cause changes to the lock policy. This results in an ABI
change for certain compilations, but only where there was already an ABI
incompatibility between the libstdc++.so library and objects built with
an incompatible -march option. In general, this means a more stable ABI
that isn't silently altered when -march flags make addition atomic ops
available.

To force a target to use "atomic" or "mutex" the new configure option
--with-libstdcxx-lock-policy can be used.

In order to turn ODR violations into linker errors, the uses of
shared_ptr in filesystem directory iterators have been replaced
with __shared_ptr, and explicit instantiations are declared. This
ensures that object files using those types cannot link to libstdc++
libs unless they use the same lock policy.

	PR libstdc++/67843
	* acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY): Add new macro
	that defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Use GLIBCXX_ENABLE_LOCK_POLICY.
	* doc/xml/manual/configure.xml: Document new configure option.
	* include/bits/fs_dir.h (directory_iterator): Use __shared_ptr
	instead of shared_ptr.
	(recursive_directory_iterator): Likewise.
	(__shared_ptr<_Dir>): Add explicit instantiation declaration.
	(__shared_ptr<recursive_directory_iterator::_Dir_stack>): Likewise.
	* include/bits/shared_ptr_base.h (__allocate_shared, __make_shared):
	Add default template argument for _Lock_policy template parameter.
	* include/ext/concurrence.h (__default_lock_policy): Check macro
	_GLIBCXX_HAVE_ATOMIC_LOCK_POLICY instead of checking if the current
	target supports the builtins for compare-and-swap.
	* src/filesystem/std-dir.cc (__shared_ptr<_Dir>): Add explicit
	instantiation definition.
	(__shared_ptr<recursive_directory_iterator::_Dir_stack>): Likewise.
	(directory_iterator, recursive_directory_iterator): Use __make_shared
	instead of make_shared.

From-SVN: r266533

    
    An inlinable function body may need to refer to result parameters, so
    each result parameter needs a name.  We already give them all names in
    start_function (via create_result_variables).  Change the export data
    so that for an inlinable function we use those names for the function
    declaration's result parameters.
    
    Reviewed-on: https://go-review.googlesource.com/c/150070

From-SVN: r266532

    
    Reviewed-on: https://go-review.googlesource.com/c/150069

From-SVN: r266531

    
    When we inline functions, we may parse types that we have not seen
    before inlining.  Inlining runs after the finalize_methods pass, so
    those types will not be finalized, meaning that we don't have an
    accurate list of which methods they support.  Explicitly finalize them
    when we parse them.
    
    Reviewed-on: https://go-review.googlesource.com/c/150068

From-SVN: r266530

    
    For inlined function bodies we're going to need to refer to variables,
    so change the existing export data to add a '$' to names that look
    like identifiers: true, false, nil, convert.
    
    While we're here drop an unnecessary space character after operators.
    
    Reviewed-on: https://go-review.googlesource.com/c/150067

From-SVN: r266529

2018-11-27  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/88199
	* include/bits/hashtable.h (_Hashtable<>::_M_assign_elements): New.
	(_Hashtable<>::operator=(const _Hashtable&)): Use latter.
	(_Hashtable<>::_M_move_assign(_Hashtable&&, false_type)): Likewise.
	* testsuite/23_containers/unordered_set/allocator/move_assign.cc
	(test03): New.

From-SVN: r266528

	PR c++/88181
	* class.c (fixup_attribute_variants): Also propagate TYPE_PACKED
	to variants.

	* g++.dg/debug/pr88181.C: New test.

From-SVN: r266527

    
    Change expression importing to use a new abstract interface class
    Import_expression, so that we can more easily import expressions from
    inlinable function bodies.  This is a refactoring with no affect on
    compiler behavior.
    
    Reviewed-on: https://go-review.googlesource.com/c/150065

From-SVN: r266526

    
    Separate the Location that import_expression uses when creating a new
    Expression from the Location used to report an error.  This is a step
    toward importing expressions for inlined functions.  This is a pure
    refactoring that does not affect compiler behavior.
    
    Reviewed-on: https://go-review.googlesource.com/c/150064

From-SVN: r266525

	PR middle-end/87157
	* gcc.dg/vect/costmodel/ppc/costmodel-vect-33.c (main1): Add noipa
	attribute.

From-SVN: r266524

    
    In preparation for writing expressions to inline function bodies,
    change the existing expression export code to use Export_function_body
    rather than Export.  Adjust existing expression exporters accordingly.
    
    This is a refactoring that doesn't affect compiler output.
    
    Reviewed-on: https://go-review.googlesource.com/c/150063

From-SVN: r266523

PR 87756 - missing unterminated argument warning using address of a constant character
PR 88211 - missing warning on printf %ls and unterminated wide member array
PR 88226 - missing warning on fprintf, fputs, and puts with an unterminated array

gcc/ChangeLog:

	* gcc.dg/tree-ssa/builtin-fprintf-warn-1.c: Update/remove xfails.
	* gcc.dg/tree-ssa/builtin-printf-warn-1.c: Same.
	* gcc.dg/tree-ssa/user-printf-warn-1.c: Same.

From-SVN: r266522

2018-11-27  Martin Liska  <mliska@suse.cz>

	* gcov.c (generate_results): Append current_working_directory
	only when exists.

From-SVN: r266521

gcc/ChangeLog:
2018-11-27  Mike Gulick  <mgulick@mathworks.com>

	PR preprocessor/83173
	* input.c (dump_location_info): Dump reason and included_from
	fields from line_map_ordinary struct.  Fix indentation when
	location > 5 digits.
	* diagnostic-show-locus.c (num_digits, num_digits): Move to
	diagnostic.c to allow it to be utilized by input.c.
	* diagnostic.c (num_digits, selftest::test_num_digits): Moved
	here.
	(selftest::diagnostic_c_tests): Run selftest::test_num_digits.
	* diagnostic.h (num_digits): Add extern definition.

libcpp/ChangeLog:
2018-11-27  Mike Gulick  <mgulick@mathworks.com>

	PR preprocessor/83173
	* location-example.txt: Update example -fdump-internal-locations
	output.

From-SVN: r266520

The short loop bug under certain conditions causes loops to
execute only once or twice, due to a hardware bug in the R5900 chip.

`-march=r5900' already enables the R5900 short loop workaround.
However, the R5900 ISA and most other MIPS ISAs are mutually
exclusive since R5900-specific instructions are generated as well.

The `-mfix-r5900' option can be used in combination with e.g.
`-mips2' or `-mips3' to generate generic MIPS binaries that also
work with the R5900 target.  The workaround is implemented by GAS
rather than by GCC.

The following small `shortloop.c' file has been used as a test
with GCC 8.2.0:

void shortloop(void)
{
    __asm__ __volatile__ (
	"	li $3, 300\n"
	"loop:\n"
	"	addi $3, -1\n"
	"	addi $4, -1\n"
	"	bne $3, $0, loop\n"
	"	li $4, 3\n"
	::);
}

The following six combinations have been tested:

% mipsr5900el-unknown-linux-gnu-gcc -O1 -c shortloop.c
% mipsr5900el-unknown-linux-gnu-gcc -O1 -c shortloop.c -mfix-r5900
% mipsr5900el-unknown-linux-gnu-gcc -O1 -c shortloop.c -mno-fix-r5900

% mipsr4000el-unknown-linux-gnu-gcc -O1 -c shortloop.c
% mipsr4000el-unknown-linux-gnu-gcc -O1 -c shortloop.c -mfix-r5900
% mipsr4000el-unknown-linux-gnu-gcc -O1 -c shortloop.c -mno-fix-r5900

The R5900 short loop erratum is corrected in exactly three cases:

1. for the target `mipsr5900el' by default;

2. for the target `mipsr5900el' with `-mfix-r5900';

3. for any other MIPS target (e.g. `mipsr4000el') with `-mfix-r5900'.

In all other cases the correction is not made.

2018-11-27  Fredrik Noring  <noring@nocrew.org>

	gcc/
	* config/mips/mips.c (mips_reorg_process_insns)
	(mips_option_override): Handle `-mfix-r5900'.
	* config/mips/mips.h (ASM_SPEC): Add `mfix-r5900' and
	`mno-fix-r5900'.
	* config/mips/mips.opt (mfix-r5900): New option.
	* doc/invoke.texi: Document the `r5900' processor name, and
	`-mfix-r5900' and `-mno-fix-r5900' options.

From-SVN: r266519

2018-11-27  Mike Gulick  <mgulick@mathworks.com>

	PR preprocessor/83173
	* gcc.dg/plugin/location-overflow-test-pr83173.c: New test.
	* gcc.dg/plugin/location-overflow-test-pr83173.h: Header for
	pr83173.c.
	* gcc.dg/plugin/location-overflow-test-pr83173-1.h: Header for
	pr83173.c.
	* gcc.dg/plugin/location-overflow-test-pr83173-2.h: Header for
	pr83173.c.
	* gcc.dg/plugin/location_overflow_plugin.c: Use PLUGIN_PRAGMAS
	instead of PLUGIN_START_UNIT.
	* gcc.dg/plugin/plugin.exp: Enable new test.

From-SVN: r266518

    
    Start reading the export data generated by the last change in this
    series.  At this point we will inline direct calls to empty functions
    and methods defined in different packages.
    
    Reviewed-on: https://go-review.googlesource.com/c/150062

From-SVN: r266517