Add function comments for recently added member functions.

gcc/
* symtab.c (set_section_for_node): Add function comment.
(set_section_from_node): Likewise.

internal/cpu: don't define CacheLinePadSize for mips64x

For libgo the definition comes from the generated file cpugen.go.

Fixes PR go/98041

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273866

compiler, runtime: check len/cap for append(s, make(T, l)...)

The overflow checks done in growslice always reported an error for the
capacity argument, even if it was the length argument that overflowed.
This change lets the code pass the current issue4085b.go test.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273806

libgo: define SO_RCVTIMEO on 32-bit GNU/Linux

Fixes golang/go#42872

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273892

compiler: improve error messages for expected curly brace

For golang/go#17328

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273890

compiler: use correct assignment order for type assertions

For "a, b := v.(T)" we must set a before b.

For golang/go#13433

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273906

compiler: always use int context for index values

For golang/go#14844

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273889

compiler: better error messages for missing interface method

For golang/go#10700

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273886

compiler: improve error for import of non-string

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273867

Add analyzer plugin support and CPython GIL example

This patch adds a new GCC plugin event: PLUGIN_ANALYZER_INIT, called
when -fanalyzer is starting, allowing for GCC plugins to register
additional state-machine-based checks within -fanalyzer.  The idea
is that 3rd-party code might want to add domain-specific checks for
its own APIs - with the caveat that the analyzer is itself still
rather experimental.

As an example, the patch adds a proof-of-concept plugin to the testsuite
for checking CPython code: verifying that code that relinquishes
CPython's global interpreter lock doesn't attempt to do anything with
PyObjects in the sections where the lock isn't held.  It also adds a
warning about nested releases of the lock, which is forbidden.
For example:

demo.c: In function 'foo':
demo.c:11:3: warning: use of PyObject '*(obj)' without the GIL
   11 |   Py_INCREF (obj);
      |   ^~~~~~~~~
  'test': events 1-3
    |
    |   15 | void test (PyObject *obj)
    |      |      ^~~~
    |      |      |
    |      |      (1) entry to 'test'
    |   16 | {
    |   17 |   Py_BEGIN_ALLOW_THREADS
    |      |   ~~~~~~~~~~~~~~~~~~~~~~
    |      |   |
    |      |   (2) releasing the GIL here
    |   18 |   foo (obj);
    |      |   ~~~~~~~~~
    |      |   |
    |      |   (3) calling 'foo' from 'test'
    |
    +--> 'foo': events 4-5
           |
           |    9 | foo (PyObject *obj)
           |      | ^~~
           |      | |
           |      | (4) entry to 'foo'
           |   10 | {
           |   11 |   Py_INCREF (obj);
           |      |   ~~~~~~~~~
           |      |   |
           |      |   (5) PyObject '*(obj)' used here without the GIL
           |

Doing so requires adding some logic for ignoring macro expansions in
analyzer diagnostics, since the insides of Py_INCREF and
Py_BEGIN_ALLOW_THREADS are not of interest to the user for these cases.

gcc/analyzer/ChangeLog:
* analyzer-pass.cc (pass_analyzer::execute): Move sorry call to...
(sorry_no_analyzer): New.
* analyzer.h (class state_machine): New forward decl.
(class logger): New forward decl.
(class plugin_analyzer_init_iface): New.
(sorry_no_analyzer): New decl.
* checker-path.cc (checker_path::fixup_locations): New.
* checker-path.h (checker_event::set_location): New.
(checker_path::fixup_locations): New decl.
* diagnostic-manager.cc
(diagnostic_manager::emit_saved_diagnostic): Call
checker_path::fixup_locations, and call fixup_location
on the primary location.
* engine.cc: Include "plugin.h".
(class plugin_analyzer_init_impl): New.
(impl_run_checkers): Invoke PLUGIN_ANALYZER_INIT callbacks.
* pending-diagnostic.h (pending_diagnostic::fixup_location): New
vfunc.

gcc/ChangeLog:
* doc/plugins.texi (Plugin callbacks): Add PLUGIN_ANALYZER_INIT.
* plugin.c (register_callback): Likewise.
(invoke_plugin_callbacks_full): Likewise.
* plugin.def (PLUGIN_ANALYZER_INIT): New event.

gcc/testsuite/ChangeLog:
* gcc.dg/plugin/analyzer_gil_plugin.c: New test.
* gcc.dg/plugin/gil-1.c: New test.
* gcc.dg/plugin/gil.h: New header.
* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the new plugin
and test.

Remove dead cc0 code from H8 port

gcc/
* config/h8300/bitfield.md: Remove "cc" attribute on any
insns where it remained.
* config/h8300/combiner.md: Likewise.
* config/h8300/jumpcall.md: Likewise.
* config/h8300/logical.md: Likewise.
* config/h8300/testcompare.md: Likewise.
* config/h8300/h8300.md (old_cc attr): Renamed from cc attr.
* config/h8300/h8300.c (notice_update_cc): Remove.
(compute_plussi_cc): Change references to CC_* to OLD_CC_.
(compute_logical_op_cc): Likewise.
(shift_one, shift_two): Likewise.
(compute_a_shift_cc): Likewise.
(get_shift_alg): Likewise.
(struct shift_insn): Change type of cc_valid field.
(struct shift_info): Likewise.
* config/h8300/save.md: Remove accidentially created file.

profopt-execute: unset testname_with_flags if create_gcov fails

When diffing test results, there sometimes occur spurious "New tests
that PASS" / "Old tests that passed, that have disappeared" messages.
The reason is that if create_gcov is not installed, then the cached
testname_with_flags is not cleared and is carried over to the next
test.

gcc/testsuite/ChangeLog:

2020-11-26  Ilya Leoshkevich  <iii@linux.ibm.com>

* lib/profopt.exp: Unset testname_with_flags if create_gcov
fails.

dse: Cope with bigger-than-integer modes [PR98037]

dse.c:find_shift_sequence tries to represent a store and load
back as a shift right followed by a truncation.  It therefore
needs to find an integer mode in which to do the shift right.
The loop it uses has the form:

  FOR_EACH_MODE_FROM (new_mode_iter,
      smallest_int_mode_for_size (GET_MODE_BITSIZE (read_mode)))

which implicitly assumes that read_mode has an equivalent integer mode.
As shown in the testcase, not all modes have such an integer mode.

This patch just makes the code start from the smallest integer mode and
skip modes that are too small.  The loop already breaks at the first
mode wider than word_mode.

gcc/
PR rtl-optimization/98037
* dse.c (find_shift_sequence): Iterate over all integers and
skip modes that are too small.

gcc/testsuite/
PR rtl-optimization/98037
* gcc.target/aarch64/sve/acle/general/pr98037.c: New test.

Optimize or+and+or pattern to and+or

gcc/
PR tree-optimization/96679
* match.pd (((b | c) & a) | b -> (a & c) | b): New pattern.

ipa: dump symtab to emergency dump file

gcc/ChangeLog:

* passes.c (emergency_dump_function): Dump symtab when
we are in an IPA pass.

changelog: add hint for a file mismatch

contrib/ChangeLog:

* gcc-changelog/git_commit.py: Suggest close file for
'unchanged file mentioned in a ChangeLog' error.
* gcc-changelog/test_email.py: Test it.

Fix non-unique testnames

gcc/testsuite

* g++.dg/warn/Wnonnull5.C: Fix non-unique testnames.
* g++.dg/warn/Wplacement-new-size-8.C: Likewise.

libstdc++: Add new C++20 headers to Doxygen settings

This doesn't actually have any effect unless you also change the
predefined value of __cplusplus, as it's currently 201703L. But if
somebody does want to do that, the new headers will get processed now.

libstdc++-v3/ChangeLog:

* doc/doxygen/user.cfg.in (INPUT): Add <latch> and <semaphore>.

libstdc++: Reduce default test timeout to 360 seconds

The current default of 10 minutes is much longer than most tests need on
common hardware. The slow tests all now have a dg-timeout-factor
directive that gives them more time to run relative to the default. The
default can also be overridden in ~/.dejagnurc or DEJAGNU=site.exp, so
it seems unnecessary to have such a large default.

This reduces the default from 10 minutes to 6 minutes, which still seems
more than enough.

libstdc++-v3/ChangeLog:

* testsuite/lib/libstdc++.exp (libstdc++_init): Reduce
default tool_timeout to 360.

libstdc++: Set dg-timeout-factor for more slow tests

As in r11-5449, this adds a muliplier to the timeout for slow tests.
This covers the majority of the <regex> and PSTL tests.

libstdc++-v3/ChangeLog:

* testsuite/20_util/specialized_algorithms/pstl/*: Add
dg-timeout-factor.
* testsuite/25_algorithms/pstl/*: Likewise.
* testsuite/26_numerics/pstl/*: Likewise.
* testsuite/28_regex/*: Likewise.

Fortran: With OpenACC, ignore OpenMP's cond comp sentinels

gcc/fortran/ChangeLog:

PR fortran/98011
* scanner.c (skip_free_comments, skip_fixed_comments): If only
-fopenacc but not -fopenmp is used, ignore OpenMP's conditional
compilation sentinels. Fix indentation, use 'else if' for readability.

gcc/testsuite/ChangeLog:

PR fortran/98011
* gfortran.dg/goacc/sentinel-free-form.f95:
* gfortran.dg/goacc-gomp/fixed-1.f: New test.
* gfortran.dg/goacc-gomp/free-1.f90: New test.
* gfortran.dg/goacc/fixed-5.f: New test.

Fortran: -fno-automatic and -fopenacc / recusion check cleanup

Options: -fopenmp and -fopenacc imply concurrent calls to a
procedure; now also -fopenacc implies -frecursive, disabling
that larger local const-size array variables use static memory.

Run-time recursion check: Always reset the check variable at the
end of the procedure; this avoids a bogus error with -fopenmp
when called twice nonconcurrently/nonrecursively. (Issue requires
using -fno-automatic or -fmax-stack-var-size= to trigger.)

gcc/fortran/ChangeLog:

PR fortran/98010
PR fortran/98013
* options.c (gfc_post_options): Also imply recursive with
-fopenacc.
* trans-decl.c (gfc_generate_function_code): Simplify condition.

Fortran's dump-parse-tree.c: Use '==' not '=' for '.eq.'.

gcc/fortran/
* dump-parse-tree.c (show_expr): Use '==' not '=' for '.eq.'.

[Ada] s-trasym.ads: update the list of supported platforms

gcc/ada/

* libgnat/s-trasym.ads: Update the list of supported platforms.

[Ada] Remove all ^L characters

gcc/ada/

* gcc-interface/Makefile.in, gcc-interface/trans.c: Remove ^L
characters.

[Ada] Enable checks on runtime by default

gcc/ada/

* gcc-interface/Makefile.in (GNATLIBFLAGS): Enable checks by
default.
* libgnat/s-bitfie.ads: Suppress alignment checks.
* libgnat/s-bituti.adb: Minor reformatting.
* libgnat/s-secsta.adb (SS_Allocate): Support Size = 0.

[Ada] Wrong replacement of Component.Discriminant

gcc/ada/

* exp_ch3.adb (Replace_Discr_Ref): Removed, no longer needed.

[Ada] Minor reuse Is_Assignable

gcc/ada/

* sem_ch5.adb (Process_Statements): Replace low-level membership
test with a high-level wrapper.

[Ada] Simplify analysis of assignment statements

gcc/ada/

* sem_ch5.adb (Set_Assignment_Type): Combine calls to Ekind
using membership test.
(Should_Transform_BIP_Assignment): Replace assignment to a
"Result" variable with simple return statements; avoid repeated
calls to Unqual_Conv by declaring a local constant.

[Ada] Minor reuse Is_Protected_Component

gcc/ada/

* lib-xref.adb (Generate_Reference): Fix reference to
Analyze_Assignment.
* sem_ch5.adb (Diagnose_Non_Variable_Lhs): Reuse existing
utility function.

[Ada] Fix internal error on extended return and fixed-point result

gcc/ada/

* contracts.adb (Check_Type_Or_Object_External_Properties): Make
sure to exclude all return objects from the SPARK legality rule
on effectively volatile variables.
* exp_ch6.adb (Expand_N_Extended_Return_Statement): Use the fast
track only when the declaration of the return object can be
dropped.

[Ada] Implement inheritance for Default_Initial_Condition and address other gaps

gcc/ada/

* einfo.ads (Is_Partial_DIC_Procedure): New function.
(Partial_DIC_Procedure): New procedure.
* einfo.adb (Is_Partial_DIC_Procedure): New function to return
whether a subprogram is a partial Default_Initial_Condition
procedure by checking the name (to avoid adding a new field).
(DIC_Procedure): Add a test that excludes partial DIC procedures
from being returned.
(Partial_DIC_Procedure): New procedure to return the partial DIC
procedure of a type, if it has one (otherwise returns Empty).
(Set_DIC_Procedure): Remove check for duplicate DIC procedures.
* exp_aggr.adb (Gen_Assign): Generate a call to the type's DIC
procedure in the case where an array component is default
initialized (due to an association with a box).
(Build_Record_Aggr_Code): For an extension aggregate, generate a
call to the ancestor type's DIC procedure (if any) when the
ancestor part is a subtype mark. For a record component
association that was specified with a box (tested for by
checking the new flag Was_Default_Init_Box_Association),
generate a call to the component type's DIC procedure (if it has
one).
* exp_ch4.adb (Expand_N_Allocator): When the allocated object is
default initialized and the designated type has a DIC aspect,
generate a call to the DIC procedure.
* exp_util.ads (Build_DIC_Call): Change the formal Obj_Id to
name Obj_Name, and change its type from Entity_Id to Node_Id
(and update comment).
(Build_DIC_Procedure_Body): Add formal Partial_DIC, remove
formal For_Freeze, and update comment accordingly.
(Build_DIC_Procedure_Declaration): Add formal Partial_DIC and
update comment.
* exp_util.adb
(Build_DIC_Call): Revised to use its Obj_Name (formerly Obj_Id)
formal directly rather than calling New_Occurrence_Of on it, to
allow arbitrary names to be passed rather than being limited to
Entity_Ids.
(Build_DIC_Procedure_Body): Call Add_Parent_DICs to generate
checks for DICs associated with any parent types, implementing
the required "additive" semantics for DICs. When building a DIC
procedure body for a partial view (when Partial_DIC is True),
call Add_Own_DIC when the type has its own DIC.  In the case of
"full" DIC procedures, a call is generated to any partial DIC
procedure of the type (unless the procedure has a null body),
along with checks for any DICs inherited by the full view.
(Build_DIC_Procedure_Declaration): Add handling for partial DIC
procedures.  For the suffix of a regular DIC procedure's name,
use "DIC" (instead of "Default_Initial_Condition"), and for the
suffix of a partial DIC procedure's name, use "Partial_DIC".
(Add_DIC_Check): Add the DIC pragma to the list of seen pragmas
(Pragmas_Seen).
(Add_Inherited_Tagged_DIC): Remove the formals Par_Typ,
Deriv_Typ, and Obj_Id, and add formal Expr, which denotes DIC's
expression. Remove the call to Replace_References (which is now
done in Add_Inherited_DICs).
(Add_Inherited_DICs): New procedure to locate a DIC pragma
associated with a parent type, replace its references
appropriately (such as any current instance references), and add
a check for the DIC.
(Add_Own_DIC): Add an Obj_Id formal to allow caller to pass the
_init formal of the generated DIC procedure.
(Add_Parent_DICs): New procedure to traverse a type's parents,
looking for DICs associated with those and calling
Add_Inherited_DICs to apply the appropriate DIC checks.
(Is_Verifiable_DIC_Pragma): Treat pragmas that have an Empty
first argument the same as a pragma without any arguments
(returning False for that case).
* exp_ch3.adb (Init_One_Dimension): Generate calls to the
component's DIC procedure when needed.
(Possible_DIC_Call): New function nested in Init_One_Dimension
to build a call to the array component type's DIC-checking
function when appropriate.
(Build_Array_Init_Proc): The presence of a DIC on the component
type is an additional condition for generating an init proc for
an array type.
(Build_Init_Statements): When the record component's type has a
DIC, and the component declaration does not have an
initialization expression, generate a call to the component
type's DIC procedure.
(Expand_N_Object_Declaration): Modify the call to Build_DIC_Call
to pass a new occurrence of the object's defining id rather than
the id itself.
(Freeze_Type): Only build a type's DIC procedure (if it has one)
for types that are not interfaces.
* exp_spark.adb (Expand_SPARK_N_Freeze_Type): Remove From_Freeze
actual and add a ??? comment.
(Expand_SPARK_N_Object_Declaration): Modify call to
Build_DIC_Call to pass a new occurrence of the object id rather
than the object id itself.
* sem_aggr.adb (Resolve_Record_Aggregate): Declare local flag
Is_Box_Init_By_Default and set it in cases where the component
association has a box and the component is being initialized by
default (as opposed to initialized by an initialization
expression associated with the component's declaration).
(Add_Association): If the association has a box for a component
initialized by default, the flag
Was_Default_Init_Box_Association is set on the new component
association (for later testing during expansion).
(Get_Value): Reset Is_Box_Init_By_Default to False.
* sem_ch3.adb (Build_Assertion_Bodies_For_Type): Rearrange code
to build DIC procedure bodies for a (noninterface) type that
Has_Own_DIC (for partial type views) or Has_DIC (for full type
views) as appropriate.
* sem_ch13.adb (Analyze_Aspect_Specifications,
Aspect_Default_Initial_Condition): Add an extra argument to the
DIC pragma to denote the type associated with the pragma (for
use in Build_DIC_Procedure_Body).
* sem_prag.adb (Analyze_Pragma): Allow two arguments for pragma
Default_Initial_Condition.  If not already present, add an extra
argument denoting the type that the pragma is associated with.
* sem_util.adb (Propagate_DIC_Attributes): Retrieve any partial
DIC procedure associated with the type and add it to the type's
list of subprograms (Subprograms_For_Type).
* sinfo.ads (Was_Default_Init_Box_Association): New flag on
N_Component_Association nodes.  Add subprograms to get and set
flag, as well as updating the documentation.
* sinfo.adb (Was_Default_Init_Box_Association): New function to
retrieve the corresponding flag (Flag14).
(Set_Was_Default_Init_Box_Association): New procedure to set the
corresponding flag (Flag14).

[Ada] Improve error recovery

gcc/ada/

* par-ch6.adb (P_Formal_Part): Remove extra call to Scan.
* par-tchk.adb: Minor reformatting.

[Ada] Reimplement Ada.Numerics.Big_Numbers.Big_Reals.Fixed_Conversions

gcc/ada/

* libgnat/a-nbnbre.adb (Float_Conversions): Instantiate Conv
package only once in the body.
(Fixed_Conversions.Float_Aux): New instance.
(Fixed_Conversions.Conv_I): Likewise.
(Fixed_Conversions.Conv_U): Likewise.
(Fixed_Conversions.LLLI): New subtype.
(Fixed_Conversions.LLLU): Likewise.
(Fixed_Conversions.Too_Large): New constant.
(Fixed_Conversions.To_Big_Real): Reimplement.
(Fixed_Conversions.From_Big_Real): Likewise.

[Ada] Compiler crash on limited conditional expressions

gcc/ada/

* exp_ch3.adb (Expand_N_Object_Declaration): Avoid crash in case
of conditional expression.

[Ada] Expand integer-only implementation of ordinary fixed-point types

gcc/ada/

* doc/gnat_rm/implementation_defined_attributes.rst (Pool_Address):
Fix pasto.
(Small_Denominator): New entry.
(Small_Numerator): Likewise.
* doc/gnat_rm/implementation_defined_characteristics.rst (3.5.9):
Relax conditions on 128-bit smalls and integer-only implementation.
* gnat_rm.texi: Regenerate.
* exp_attr.adb (Expand_N_Attribute_Reference) <Attribute_Fore>:
Relax conditions on integer implementation for ordinary fixed-point
types and pass a third parameter to the routine.
<Attribute_Small_Denominator>: Raise Program_Error.
<Attribute_Small_Numerator>: Likewise.
* exp_fixd.adb (Expand_Convert_Fixed_To_Fixed): Use a scaled divide
if the numerator and denominator of the small ratio are sufficiently
small integers.
(Expand_Convert_Fixed_To_Integer): Use a scaled divide if numerator
and denominator of the small value are sufficiently small integers.
(Expand_Convert_Integer_To_Fixed): Likewise.
* exp_imgv.adb (Expand_Image_Attribute): Relax the conditions on the
integer implementation for ordinary fixed-point types.
(Expand_Value_Attribute): Likewise.
* freeze.adb (Freeze_Fixed_Point_Type): Relax conditions on 128-bit
smalls.
* sem_attr.adb (Analyze_Attribute) <Attribute_Small_Denominator>:
Check no arguments, fixed-point and set type to Universal_Integer.
<Attribute_Small_Numerator>: Likewise.
(Eval_Attribute) <Attribute_Small_Denominator>: Fold statically.
<Attribute_Small_Numerator>: Likewise.
* snames.ads-tmpl (Name_Small_Denominator): New attribute name.
(Name_Small_Numerator): Likewise.
(Attribute_Id): Add Attribute_Small_{Denominator,Numerator}.
* libgnat/a-tifiio.adb (Exact): Delete.
(Need_64): Likewise.
(OK_Get_32): New boolean constant.
(OK_Put_32): Likewise.
(OK_Get_64): Likewise.
(OK_Put_64): Likewise.
(E): Adjust.
(Get procedures): Likewise.
(Put procedures): Likewise.
* libgnat/a-tifiio__128.adb (Exact): Delete.
(Need_64): Likewise.
(Need_128): Likewise.
(OK_Get_32): New boolean constant.
(OK_Put_32): Likewise.
(OK_Get_64): Likewise.
(OK_Put_64): Likewise.
(OK_Get_128): Likewise.
(OK_Put_128): Likewise.
(E): Adjust.
(Get procedures): Likewise.
(Put procedures): Likewise.
* libgnat/a-wtfiio.adb (Exact): Delete.
(Need_64): Likewise.
(OK_Get_32): New boolean constant.
(OK_Put_32): Likewise.
(OK_Get_64): Likewise.
(OK_Put_64): Likewise.
(E): Adjust.
(Get procedures): Likewise.
(Put procedures): Likewise.
* libgnat/a-wtfiio__128.adb (Exact): Delete.
(Need_64): Likewise.
(Need_128): Likewise.
(OK_Get_32): New boolean constant.
(OK_Put_32): Likewise.
(OK_Get_64): Likewise.
(OK_Put_64): Likewise.
(OK_Get_128): Likewise.
(OK_Put_128): Likewise.
(E): Adjust.
(Get procedures): Likewise.
(Put procedures): Likewise.
* libgnat/a-ztfiio.adb (Exact): Delete.
(Need_64): Likewise.
(OK_Get_32): New boolean constant.
(OK_Put_32): Likewise.
(OK_Get_64): Likewise.
(OK_Put_64): Likewise.
(E): Adjust.
(Get procedures): Likewise.
(Put procedures): Likewise.
* libgnat/a-ztfiio__128.adb (Exact): Delete.
(Need_64): Likewise.
(Need_128): Likewise.
(OK_Get_32): New boolean constant.
(OK_Put_32): Likewise.
(OK_Get_64): Likewise.
(OK_Put_64): Likewise.
(OK_Get_128): Likewise.
(OK_Put_128): Likewise.
(E): Adjust.
(Get procedures): Likewise.
(Put procedures): Likewise.
* libgnat/s-fore_f.ads (Fore_Fixed): Adjust signature.
* libgnat/s-fore_f.adb (Fore_Fixed): Reimplement.
* libgnat/s-fofi32.ads (Fore_Fixed32): Adjust signature.
* libgnat/s-fofi64.ads (Fore_Fixed64): Likewise.
* libgnat/s-fofi128.ads (Fore_Fixed128): Likewise.
* libgnat/s-imagef.ads: Adjust description.
* libgnat/s-imagef.adb (Maxdigs): Move around.
(Set_Image_Integer): Remove assertion.
* libgnat/s-valuef.ads: Adjust description.
* libgnat/s-valuef.adb (Integer_To_Fixed): Minor tweak.

[Ada] Implement -gnateb switch

gcc/ada/

* doc/gnat_ugn/building_executable_programs_with_gnat.rst:
Describe -gnateb switch.
* doc/gnat_ugn/the_gnat_compilation_model.rst: Mention -gnateb
switch in configuration pragma files section.
* gnat_ugn.texi: Regenerate.
* lib-writ.adb (Write_ALI): Strip directories from configuration
files path if needed.
* opt.ads: Declare Config_Files_Store_Basename option.
* par.adb (Par): Save configuration file checksum.
* switch-c.adb (Scan_Front_End_Switches): Set
Config_Files_Store_Basename true if -gnateb is present.

[Ada] Potential read of uninitialized variable in exp_dist.adb

gcc/ada/

* exp_dist.adb (RCI_Cache): Initialize.

[Ada] Address warning compiling terminals.c

gcc/ada/

* terminals.c (allocate_pty_desc): Copy one less byte since the
last byte will always be set to 0.

[Ada] Add stream-oriented attributes support for 128-bit integer types

gcc/ada/

* doc/gnat_ugn/building_executable_programs_with_gnat.rst (-xdr):
Document that XDR is not supported for 128-bit integer types.
* gnat_ugn.texi: Regenerate.
* exp_strm.adb (Build_Elementary_Input_Call): Deal with types
larger than Long_Long_Integer.
(Build_Elementary_Write_Call): Likewise.
* rtsfind.ads (RE_Id): Add RE_I_LLL{I,U] and RE_W_LLL{I,U}.
(RE_Unit_Table): Add entries for them.
* libgnat/s-stratt.ads (I_LLLI): New inline function.
(I_LLLU): Likewise.
(W_LLLI): New inline procedure.
(W_LLLU): Likewise.
* libgnat/s-stratt.adb (S_LLLI): New subtype of SEA.
(S_LLLU): Likewise.
(From_LLLI): New instance of Unchecked_Conversion.
(From_LLLU): Likewise.
(To_LLLI): Likewise.
(To_LLLU): Likewise.
(I_LLLI): Implement.
(I_LLLU): Likewise.
(W_LLLI): Likewise.
(W_LLLU): Likewise.

[Ada] Spurious error on iterator over container with modified private part

gcc/ada/

* exp_ch5.adb (Expand_Iterator_Loop_Over_Container): Check the
signature of the private operation Get_Element_Access to prevent
accidental use of a user-defined homonym subprogram.

[Ada] Add comment on special Heap variable used in GNATprove

gcc/ada/

* spark_xrefs.ads: Add comment for Heap that it may remain
Empty.

[Ada] Fix serial port control setting on GNU/Linux

gcc/ada/

* libgnat/g-sercom__linux.adb (Set): Fix control flags of the
serial port setting.

[Ada] Minor style fixes

gcc/ada/

* libgnat/g-sercom__linux.adb: Minor style fixes.

[Ada] Fix folding of comparison operators in GNATprove mode

gcc/ada/

* exp_util.adb (Get_Current_Value_Condition): Don't use current
value tracking in GNATprove mode.
* sem_res.adb (Resolve_Comparison_Op): Remove incomplete
special-casing for folding in GNATprove mode.

[Ada] Crash on ghost assignment check for illegal code

gcc/ada/

* errout.adb (Error_Msg_NEL): Do not call Set_Posted if errors
are being ignored.
(Error_Msg): Change Errors_Must_Be_Ignored to use the getter.
* sem_ch8.adb (Find_Direct_Name): Do not skip all the error
checks when ignoring errors, but instead do not add an entry to
the Urefs table if errors are being ignored.
* exp_ch5.adb: Minor comment fix.

[Ada] Add continuation message when others choice not allowed

gcc/ada/

* sem_aggr.adb (Resolve_Array_Aggregate): Improve error message.

[Ada] Small cleanup in System.Value_F

gcc/ada/

* libgnat/s-valuef.adb (Integer_To_Fixed): Do not modify numerator
or denominator in order to reduce the exponent.

[Ada] Confusion in Transform_Function_Array and internal subprograms

gcc/ada/

* ali-util.adb (Get_File_Checksum): Remove dead code.
* exp_ch4.adb (Expand_Boolean_Operator, Expand_N_Op_Not,
Make_Boolean_Array_Op): Take Transform_Function_Array into
account.
* exp_ch6.adb (Expand_Call_Helper): Update comment. Code
cleanup.
* exp_util.adb (Build_Procedure_Form): Use new predefined name
Name_UP_RESULT.
* snames.ads-tmpl (Name_UP_RESULT): New predefined name.  Code
cleanup: remove unused names from the project parser, moved to
gprbuild sources.
* xsnamest.adb: Add support for uppercase names.

[Ada] Spurious visibility error in subprogram body in with_clause

gcc/ada/

* sem_util.adb (Enter_Name): When an inherited operation for a
local derived type is hidden by an explicit declaration of a
non-overloadable entity in the same scope, make the inherited
operation non-visible to prevent its accidental use elsewhere.

tree-optimization/98064 - fix BB SLP live lane extract wrt LC SSA

This avoids breaking LC SSA when SLP codegen pulled an out-of-loop
def into a loop when merging with in-loop defs for an external def.

2020-11-30  Richard Biener  <rguenther@suse.de>

PR tree-optimization/98064
* tree-vect-loop.c (vectorizable_live_operation): Avoid
breaking LC SSA for BB vectorization.

* g++.dg/vect/pr98064.cc: New testcase.

changelog: allow subdir wildcard entry

contrib/ChangeLog:

* gcc-changelog/git_commit.py: Allow sub-directory wildcard
changelog entry. Fix a typo caused by apostrophe escaping.
* gcc-changelog/test_email.py: Test it.
* gcc-changelog/test_patches.txt: Likewise.

doc: Fix description of dg-require-effective-target

The optional target selector for the dg-require-effective-target
directive needs to be { target selector } not just { selector } as
currently documented.

gcc/ChangeLog:

* doc/sourcebuild.texi (Directives): Fix description of
dg-require-effective-target to include "target" in selector.

tree-optimization/98048 - fix vector lowering of ABSU_EXPR

This makes sure to use the correct type for the LHS of the scalar
replacement statement.

20220-11-30  Richard Biener  <rguenther@suse.de>

PR tree-optimization/98048
* tree-vect-generic.c (expand_vector_operations_1): Use the
correct type for the scalar LHS replacement.

* gcc.dg/vect/pr98048.c: New testcase.

gimple ISEL: fix BB stmt iteration

gcc/ChangeLog:

PR tree-optimization/98066
* gimple-isel.cc (gimple_expand_vec_exprs): Return when
gimple_expand_vec_exprs replaces last stmt.

gcc-changelog: Add libstdc++-v3/testsuite to wildcard prefixes

This allows using "testsuite/*" in libstdc++-v3/ChangeLog entries, which
was one of the original motivations for adding wildcard support in the
first place:
https://gcc.gnu.org/pipermail/gcc/2020-June/232719.html

contrib/ChangeLog:

* gcc-changelog/git_commit.py (wildcard_prefixes): Add libstdc++
testsuite directory.

rtl_dump_bb: fix segfault when reporting internal error

During ICE reporting, sometimes rtl_dump_bb is called on partially
initialized basic blocks.  This produces another ICE, obscuring the
original problem.

Fix by checking that that basic blocks are initialized before touching
their bb_infos.

gcc/ChangeLog:

2020-11-25  Ilya Leoshkevich  <iii@linux.ibm.com>

* cfgrtl.c (rtl_bb_info_initialized_p): New function.
(rtl_dump_bb): Use rtl_bb_info_initialized_p before accessing bb
insns.

d: Add freebsd support for D compiler and runtime

gcc/ChangeLog:

PR d/87818
* config.gcc (*-*-freebsd*): Add freebsd-d.o and t-freebsd.
* config/freebsd-d.c: New file.
* config/t-freebsd: New file.

libphobos/ChangeLog:

PR d/87818
* configure.tgt: Add x86_64-*-freebsd* and i?86-*-freebsd* as
supported targets.

[Obvious] arm: Fix test from failing on some targets [PR91816]

This recently submitted test was found to fail on some Cortex-M
targets. This was because codegen on these CPUs would emit a ldr
instead of a movw/movt pair, resulting in an overall smaller test
(i.e. the branch wasn't as far) and the behaviour being tested
for not being triggered.

This commit doubles the size of the test to account for this.

gcc/testsuite/ChangeLog:

* gcc.target/arm/pr91816.c: New test.

expansion: Improve double-word modulo by certain constant divisors [PR97459]

As discussed in the PR, e.g. on x86_64 (both -m32 and -m64) there is no
double-word modulo and so we expand it to a __{,u}mod[dt]i3 call.
For certain constant divisors we can do better.  E.g. consider
32-bit word-size, 0x100000000ULL % 3 == 1, so we can use partly the Hacker's
delight modulo by summing digits approach and optimize
unsigned long long foo (unsigned long long x) { return x % 3; }
as
unsigned long long foo (unsigned long long x) {
  unsigned int sum, carry;
  carry = __builtin_add_overflow ((unsigned int) x, (unsigned int) (x >> 32), &sum);
  sum += carry;
  return sum % 3;
}
Similarly, 0x10000000ULL % 5 == 1 (note, 1 << 28), so
unsigned long long bar (unsigned long long x) { return x % 5; }
as
unsigned long long bar (unsigned long long x) {
  unsigned int sum = x & ((1 << 28) - 1);
  sum += (x >> 28) & ((1 << 28) - 1);
  sum += (x >> 56);
  return sum % 5;
}
etc.
And we can do also signed modulo,
long long baz (long long x) { return x % 5; }
as
long long baz (long long x) {
  unsigned int sum = x & ((1 << 28) - 1);
  sum += ((unsigned long long) x >> 28) & ((1 << 28) - 1);
  sum += ((unsigned long long) x >> 56);
  /* Sum adjustment for negative x.  */
  sum += (x >> 63) & 3;
  unsigned int rem = sum % 5;
  /* And finally adjust it to the right interval for negative values.  */
  return (int) (rem + ((x >> 63) & -4));
}

2020-11-30  Jakub Jelinek  <jakub@redhat.com>

PR rtl-optimization/97459
* internal-fn.h (expand_addsub_overflow): Declare.
* internal-fn.c (expand_addsub_overflow): No longer static.
* optabs.c (expand_doubleword_mod): New function.
(expand_binop): Optimize double-word mod with constant divisor.

* gcc.dg/pr97459-1.c: New test.
* gcc.dg/pr97459-2.c: New test.

changelog: Allow wildcard pattern only.

contrib/ChangeLog:

* gcc-changelog/git_commit.py: Allow wildcard pattern only.

RISC-V: Always define MULTILIB_DEFAULTS

 - Define MULTILIB_DEFAULTS can reduce the total number of multilib if
   the default arch and ABI are listed in the multilib config.

 - This also simplify the implementation of --with-multilib-list.

gcc/ChangeLog:

* config.gcc (riscv*-*-*): Add TARGET_RISCV_DEFAULT_ABI and
TARGET_RISCV_DEFAULT_ARCH to tm_defines.
Remove including riscv/withmultilib.h for --with-multilib-list.
* config/riscv/riscv.h (STRINGIZING): New.
(__STRINGIZING): Ditto.
(MULTILIB_DEFAULTS): Ditto.
* config/riscv/withmultilib.h: Remove.

Fix print_multilib_info when default arguments appear in the option list with '!'

This issue is found when we try to always define MULTILIB_DEFAULTS for -march
and -mabi for RISC-V back-end, however `-print-multi-lib` will skip
multi-lib setting if match any one of flag in MULTILIB_DEFAULTS, even
some options are specified in the option list with '!'.

e.g.

We have default march=rv32i and mabi=ilp32.

And we have following multi-lib set:

". !march=rv32i !march=rv32im !march=rv32imafc !mabi=ilp32 !mabi=ilp32f;"
"rv32i/ilp32 march=rv32i !march=rv32im !march=rv32imafc mabi=ilp32 !mabi=ilp32f;"
"rv32im/ilp32 !march=rv32i march=rv32im !march=rv32imafc mabi=ilp32 !mabi=ilp32f;"
"rv32imafc/ilp32f !march=rv32i !march=rv32ic !march=rv32im march=rv32imafc !mabi=ilp32 mabi=ilp32f;"

`-print-multi-lib` willl show `.` and `rv32imafc/ilp32f` only, because
the mabi=ilp32 is matched, however there is `!march=rv32i` in `rv32im/ilp32`, so
`rv32im/ilp32` should keep, because it reject march=rv32i.

Note: This can be reproduced via following configure options with patch [1]:
gcc/configure --target=riscv64-elf --with-arch=rv32i --with-abi=ilp32 \
  --with-multilib-generator="rv32i-ilp32--;rv32im-ilp32--;rv32imafc-ilp32f--"

[1] https://gcc.gnu.org/pipermail/gcc-patches/2020-November/559707.html

gcc/ChangeLog:

* gcc.c (print_multilib_info): Check default arguments not
appeared in multi-lib option list with '!'

fixed _bswapsi2 function

libgcc

* libgcc2.c (bswapsi2): Make constants unsigned.

Fix minor bug in ft32 widening multiply

gcc/
* config/ft32/ft32.md (umulsidi3): Do not allow constants as
arguments.

Daily bump.

PR fortran/98017 - Suspected regression using PACK

When substituting a parameter variable of type character, the character
length was reset to 1.  Fix this by copying the length.

gcc/fortran/ChangeLog:

* expr.c (simplify_parameter_variable): Fix up character length
after copying an array-valued expression.

gcc/testsuite/ChangeLog:

* gfortran.dg/pr98017.f90: New test.

Fix handling of ignore_stores in ipa_merge_modref_summary_after_inlining

* ipa-modref.c (ipa_merge_modref_summary_after_inlining): Fix
handling of ignore_stores.

Fix freeing of thunk-info

PR jit/97867
* symtab-thunks.h (thunk_info::release): Use ggc_delete.

Handle PHIs in compute_objsize.

PR middle-end/92936 - missing warning on a past-the-end store to a PHI
PR middle-end/92940 - incorrect offset and size in -Wstringop-overflow for out-of-bounds store into VLA and two offset ranges
PR middle-end/89428 - missing -Wstringop-overflow on a PHI with variable offset

gcc/ChangeLog:

PR middle-end/92936
PR middle-end/92940
PR middle-end/89428
* builtins.c (access_ref::access_ref): Initialize member.
(access_ref::phi): New function.
(access_ref::get_ref): New function.
(access_ref::add_offset): Remove duplicate assignment.
(maybe_warn_for_bound): Add "maybe" kind of warning messages.
(warn_for_access): Same.
(inform_access): Rename...
(access_ref::inform_access): ...to this.  Print PHI arguments.  Format
offset the same as size and simplify.  Improve printing of allocation
functions and VLAs.
(check_access): Adjust to the above.
(gimple_parm_array_size): Change argument.
(handle_min_max_size): New function.
* builtins.h (class ssa_name_limit_t): Move class here from
tree-ssa-strlen.c.
(struct access_ref): Declare new members.
(gimple_parm_array_size): Change argument.
* tree-ssa-strlen.c (maybe_warn_overflow): Use access_ref and simplify.
(handle_builtin_memcpy): Correct argument passed to maybe_warn_overflow.
(handle_builtin_memset): Same.
(class ssa_name_limit_t): Move class to builtins.{h,c}.

gcc/testsuite/ChangeLog:

PR middle-end/92936
PR middle-end/92940
PR middle-end/89428
* c-c++-common/Wstringop-overflow-2.c: Adjust text of expected
informational notes.
* g++.dg/warn/Wstringop-overflow-3.C: Same.
* g++.dg/warn/Wplacement-new-size.C: Remove a test for a no longer
issued warning.
* gcc.dg/Warray-bounds-43.c: Removed unused declarations.
* gcc.dg/Wstringop-overflow-11.c: Remove xfails.
* gcc.dg/Wstringop-overflow-12.c: Same.
* gcc.dg/Wstringop-overflow-17.c: Adjust text of expected messages.
* gcc.dg/Wstringop-overflow-27.c: Same.  Remove xfails.
* gcc.dg/Wstringop-overflow-28.c: Adjust text of expected messages.
* gcc.dg/Wstringop-overflow-29.c: Same.
* gcc.dg/Wstringop-overflow-37.c: Same.
* gcc.dg/Wstringop-overflow-46.c: Same.
* gcc.dg/Wstringop-overflow-47.c: Same.
* gcc.dg/Wstringop-overflow-54.c: Same.
* gcc.dg/warn-strnlen-no-nul.c: Add expected warning.
* gcc.dg/Wstringop-overflow-7.c: New test.
* gcc.dg/Wstringop-overflow-58.c: New test.
* gcc.dg/Wstringop-overflow-59.c: New test.
* gcc.dg/Wstringop-overflow-60.c: New test.
* gcc.dg/Wstringop-overflow-61.c: New test.
* gcc.dg/Wstringop-overflow-62.c: New test.
* gcc.dg/Wstringop-overflow-63.c: New test.
* gcc.dg/Wstringop-overflow-64.c: New test.

d: Add darwin support for D language front-end

gcc/ChangeLog:

* config.gcc (*-*-darwin*): Set d_target_objs and target_has_targetdm.
* config/elfos.h (TARGET_D_MINFO_SECTION): New macro.
(TARGET_D_MINFO_START_NAME): New macro.
(TARGET_D_MINFO_END_NAME): New macro.
* config/t-darwin: Add darwin-d.o.
* doc/tm.texi: Regenerate.
* doc/tm.texi.in (D language and ABI): Add @hook for
TARGET_D_MINFO_SECTION, TARGET_D_MINFO_START_NAME, and
TARGET_D_MINFO_END_NAME.
* config/darwin-d.c: New file.

gcc/d/ChangeLog:

* d-target.def (d_minfo_section): New hook.
(d_minfo_start_name): New hook.
(d_minfo_end_name): New hook.
* modules.cc: Include d-target.h.
(register_moduleinfo): Update to use new targetdm hooks.

configure: Support building D front-end on *-*-darwin*

The bootstrap has been confirmed to be succeeding, there's no need to
set it as an unsupported language.

ChangeLog:

PR d/87788
* configure.ac: Don't disable D for *-*-darwin*.
* configure: Regenerate.

Fix hppa64-hpux11 build to remove source paths from embedded path.

This change adds the +nodefaultrpath ld option to remove all library
paths that were specified with the -L option from the embedded path.

2020-11-29  John David Anglin  <danglin@gcc.gnu.org>

ChangeLog:
* libtool.m4 (archive_cmds): Add +nodefaultrpath ld option on
hppa64-*-hpux11*.

libatomic/ChangeLog:
* configure: Regenerate.

libbacktrace/ChangeLog:
* configure: Regenerate.

libcc1/ChangeLog:
* configure: Regenerate.

libffi/ChangeLog:
* configure: Regenerate.

libgfortran/ChangeLog:
* configure: Regenerate.

libgomp/ChangeLog:
* configure: Regenerate.

libhsail-rt/ChangeLog:
* configure: Regenerate.

libitm/ChangeLog:
* configure: Regenerate.

libobjc/ChangeLog:
* configure: Regenerate.

liboffloadmic/ChangeLog:
* configure: Regenerate.
* plugin/configure: Regenerate.

libquadmath/ChangeLog:
* configure: Regenerate.

libsanitizer/ChangeLog:
* configure: Regenerate.

libssp/ChangeLog:
* configure: Regenerate.

libstdc++-v3/ChangeLog:
* configure: Regenerate.

libvtv/ChangeLog:
* configure: Regenerate.

lto-plugin/ChangeLog:
* configure: Regenerate.

zlib/ChangeLog:
* configure: Regenerate.

Fix PR ada/97504 on hppa*-*-hpux*.

2020-11-29  John David Anglin  <danglin@gcc.gnu.org>

gcc/ada/
PR ada/97504
* Makefile.rtl (LIBGNAT_TARGET_PAIRS) <hppa*-*-hpux*>: Use wraplf
version of Aux_Long_Long_Float.

Skip EAF_UNUSED parameters in handle_pure_call

* tree-ssa-structalias.c (handle_pure_call): Skip EAF_UNUSED
 parameters.

Detect unused parameters in ipa-modref

* ipa-modref.c (modref_lattice::merge): Do nothing if F is EAF_UNUSED.
(analyze_parms): Detect unused params.
(modref_merge_call_site_flags): Merge correct EAF_UNUSED.

d: Remove d_size_t from front-end sources (PR 87788)

The typedef for d_size_t assumes that the implementation of the
front-end is written in D itself, where size_t can map only to uint32_t
or uint64_t.  As that is not the case for the current D front-end, the
typedef should be removed. This would fix the bootstrap on targets where
in C++ size_t is a long, such as darwin i386.

Reviewed-on: https://github.com/dlang/dmd/pull/12008

gcc/d/ChangeLog:

PR d/87788
* dmd/MERGE: Merge upsream dmd 45fa6cfd2.

Daily bump.

Improve support of simple bit-fields in -fdump-ada-spec

This fixes an issue with nested structures and adds an Alignment clause
to counter the effect of the Pack aspect.

gcc/c-family/ChangeLog:
* c-ada-spec.c (dump_nested_type) <RECORD_TYPE>: Remove obsolete code.
(dump_ada_structure): Also deal with convention, unchecked union and
bit-field for nested types.  In the latter case, print an Alignment
aspect along with the Pack aspect.

compiler: avoid follow-on errors for bad types

Mark bad types as erroneous, to avoid generating further errors.

This required some code using array types to check for errors.

For https://golang.org/issue/19880

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273626

compiler: better error for x, x := 1, 2

Was
    assign.go:59:28: error: multiple assignments to x
Now
    assign.go:59:28: error: ‘x’ repeated on left side of :=

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273546

Fix PR target/97939

The little dance around 4096 that add/sub instructions do on the SPARC
needs to be taken into account for the overflow arithmetic operations.
It cannot be done for unsigned overflow, but it can be done for signed
overflow.

gcc/ChangeLog:
PR target/97939
* config/sparc/predicates.md (arith_double_add_operand): Comment.
* config/sparc/sparc.md (uaddvdi4): Use arith_double_operand.
(addvdi4): Use arith_double_add_operand.
(addsi3): Remove useless attributes.
(addvsi4): Use arith_add_operand.
(*cmp_ccv_plus): Likewise and add second alternative accordingly.
(*cmp_ccxv_plus): Likewise.
(*cmp_ccv_plus_set): Likewise.
(*cmp_ccxv_plus_set): Likewise.
(*cmp_ccv_plus_sltu_set): Likewise.
(usubvdi4): Use arith_double_operand.
(subvdi4): Use arith_double_add_operand.
(subsi3): Remove useless attributes.
(subvsi4): Use arith_add_operand.
(*cmp_ccv_minus): Likewise and add second alternative accordingly.
(*cmp_ccxv_minus): Likewise.
(*cmp_ccv_minus_set): Likewise.
(*cmp_ccxv_minus_set): Likewise.
(*cmp_ccv_minus_sltu_set): Likewise.
(negsi2): Use register_operand.
(unegvsi3): Likewise.
(negvsi3) Likewise.
(*cmp_ccnz_neg): Likewise.
(*cmp_ccxnz_neg): Likewise.
(*cmp_ccnz_neg_set): Likewise.
(*cmp_ccxnz_neg_set): Likewise.
(*cmp_ccc_neg_set): Likewise.
(*cmp_ccxc_neg_set): Likewise.
(*cmp_ccc_neg_sltu_set): Likewise.
(*cmp_ccv_neg): Likewise.
(*cmp_ccxv_neg): Likewise.
(*cmp_ccv_neg_set): Likewise.
(*cmp_ccxv_neg_set): Likewise.
(*cmp_ccv_neg_sltu_set): Likewise.

gcc/testsuite/ChangeLog:
* gcc.target/sparc/overflow-6.c: New test.

Generate correct fn specs for some Fortran library functions.

This patch works by generating the correct fn spec from the
actual arguments in specific_intrinsic_symbol, and by passing this
down via gfc_get_extern_function_decl to gfc_get_function_type.
CSHIFT remains to be done.

gcc/fortran/ChangeLog:

PR fortran/97454
* trans-decl.c (gfc_get_extern_function_decl): Add argument
fnspec.
* trans-intrinsic.c (MAX_SPEC_ARG): Define.
(intrinsic_fnspec): New function.
(ADD_CHAR): Define.
(specific_intrinsic_symbol): Adjust comment. Pass
fn spec to gfc_get_extern_function_decl.
(gfc_conv_intrinsic_funcall): Add ANY, ALL, NORM2, PRODUCT
and SUM intrnisic. Add FIXME for cshift et al.
* trans-types.c (gfc_get_function_type): Add fnspec argument,
handle it.
* trans-types.h (gfc_get_function_type): Add optinal fnspec
argument.
* trans.h (gfc_get_extern_function_decl): Likewise.

Daily bump.

Revert previous change and use pragma to suppress -Wformat-diag.

gcc/cp/ChangeLog:

* error.c (add_quotes): Revert previous change and use pragma to
suppress -Wformat-diag.

preprocessor: Fix #line overflow check [PR97602]

The preprocessor check for overflow (of linenum_type = unsigned int)
when reading the line number in a #line directive is incomplete; it
checks "reg < reg_prev" which doesn't cover all cases where
multiplying by 10 overflowed.  Fix this by checking for overflow
before rather than after it occurs (using essentially the same logic
as used by e.g. glibc printf when reading width and precision values
from strings).

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

libcpp/
2020-11-27  Joseph Myers  <joseph@codesourcery.com>

PR preprocessor/97602
* directives.c (strtolinenum): Check for overflow before it
occurs.  Correct comment.

gcc/testsuite/
2020-11-27  Joseph Myers  <joseph@codesourcery.com>

PR preprocessor/97602
* gcc.dg/cpp/line9.c, gcc.dg/cpp/line10.c: New tests.

libphobos: Fix segfault at run-time when using custom Fibers (PR 98025)

When libphobos is configured with --enable-cet, this adds extra fields
to the Fiber class to support the ucontext_t fallback implementation.
These fields get omitted when compiling user code unless they also used
`-fversion=CET' to build their project, which resulted in data being
overwritten from within swapcontext().

On reviewing the ucontext_t definitions, it was found that the shadow
stack fields were missing, and the struct size didn't match up on X32.
This has been fixed in upstream druntime and merged down here.

Reviewed-on: https://github.com/dlang/druntime/pull/3293

libphobos/ChangeLog:

PR d/98025
* Makefile.in: Regenerate.
* configure: Regenerate.
* configure.ac (DCFG_ENABLE_CET): Substitute.
* libdruntime/MERGE: Merge upstream druntime 0fe7974c.
* libdruntime/Makefile.in: Regenerate.
* libdruntime/core/thread.d: Import gcc.config.
(class Fiber): Add ucontext_t fields when GNU_Enable_CET is true.
* libdruntime/gcc/config.d.in (GNU_Enable_CET): Define.
* src/Makefile.in: Regenerate.
* testsuite/Makefile.in: Regenerate.

d: Merge upstream dmd db0df3f7e.

Removes all support code and tests for the extern(Pascal) calling
convention.

Reviewed-on: https://github.com/dlang/dmd/pull/11994

gcc/d/ChangeLog:

* dmd/MERGE: Merge upstream dmd db0df3f7e.
* types.cc (TypeVisitor::visit (TypeFunction *)): Remove LINKpascal.

libphobos: Merge upstream druntime d37ef985.

Adds support for FreeBSD/x86 53-bit precision reals, updates bindings
for FreeBSD 12.x, and removes all support code and tests for the
extern(Pascal) calling convention.

Reviewed-on: https://github.com/dlang/druntime/pull/3286
     https://github.com/dlang/druntime/pull/3287

libphobos/ChangeLog:

* libdruntime/MERGE: Merge upstream druntime d37ef985.
* libdruntime/Makefile.am (DRUNTIME_DSOURCES_FREEBSD): Add
core/sys/freebsd/config.d
* libdruntime/Makefile.in: Regenerate.

libphobos: Merge upstream phobos 38873fe6e.

Adds support for FreeBSD/x86 53-bit precision reals, and removes all
support code and tests for the extern(Pascal) calling convention.

Reviewed-on: https://github.com/dlang/phobos/pull/7704
     https://github.com/dlang/phobos/pull/7705

libphobos/ChangeLog:

* src/MERGE: Merge upstream phobos 38873fe6e.

d: Add float and double overloads for all core.math intrinsics

For the math intrinsics: cos, fabs, ldexp, rint, rndtol, and sin, new
overloads have been added to the core.math module for matching float and
double types.  These have been implemented in the compiler.

A recent change to dump_function_to_file started triggering some
scan-tree-dump tests to FAIL, these have been adjusted as well when
updating the test.

gcc/d/ChangeLog:

* intrinsics.cc (maybe_expand_intrinsic): Handle new intrinsics.
* intrinsics.def (INTRINSIC_COS): Add float and double overloads.
(INTRINSIC_FABS): Likewise.
(INTRINSIC_LDEXP): Likewise.
(INTRINSIC_RINT): Likewise.
(INTRINSIC_RNDTOL): Likewise.
(INTRINSIC_SIN): Likewise.
(INTRINSIC_TOPREC): Adjust signature.

libphobos/ChangeLog:

* libdruntime/MERGE: Merge upstream druntime 5e4492c4.

gcc/testsuite/ChangeLog:

* gdc.dg/intrinsics.d: Adjust patterns in scan-tree-dump.

testsuite/i386: Fix XOP and FMA4 checking functions [PR98036].

Add missing returns and remove unnecessary postfix increments.

2020-11-27  Uroš Bizjak  <ubizjak@gmail.com>

PR testsuite/98036

gcc/testsuite/
* gcc.target/i386/fma4-256-maccXX.c (check_maccps):
Remove unnecessary postfix increment on a returned variable.
(check_maccpd): Ditto.
* gcc.target/i386/fma4-256-msubXX.c (check_msubps): Ditto.
(check_msubpd): Ditto.
* gcc.target/i386/fma4-256-nmaccXX.c (check_nmaccps): Ditto.
(check_nmaccpd): Ditto.
* gcc.target/i386/fma4-256-nmsubXX.c (check_nmsubps): Ditto.
(check_nmsubpd): Ditto.
* gcc.target/i386/fma4-maccXX.c (check_maccps): Ditto.
(check_maccpd): Ditto.
(check_maccss): Ditto.
(check_maccsd): Ditto.
* gcc.target/i386/fma4-msubXX.c (check_msubps): Ditto.
(check_msubpd): Ditto.
(check_msubss): Ditto.
(check_msubsd): Ditto.
* gcc.target/i386/fma4-nmaccXX.c (check_nmaccps): Ditto.
(check_nmaccpd): Ditto.
(check_nmaccss): Ditto.
(check_nmaccsd): Ditto.
* gcc.target/i386/fma4-nmsubXX.c (check_nmsubps): Ditto.
(check_nmsubpd): Ditto.
(check_nmsubss): Ditto.
(check_nmsubsd): Ditto.
* gcc.target/i386/xop-haddX.c (check_sbyte2word): Add missing return.
(check_sbyte2dword):
Remove unnecessary postfix increment on a returned value.
(check_sbyte2qword): Ditto.
(check_sword2dword): Add missing return.
(check_sword2qword):
Remove unnecessary postfix increment on a returned value.
(check_dword2qword): Add missing return.
* gcc.target/i386/xop-hadduX.c (check_byte2word): Add missing return.
(check_byte2dword):
Remove unnecessary postfix increment on a returned value.
(check_byte2qword): Ditto.
(check_word2dword): Add missing return.
(check_word2qword):
Remove unnecessary postfix increment on a returned value.
(check_word2qword): Add missing return.
* gcc.target/i386/xop-hsubX.c (check_sbyte2word): Add missing return.
(check_sword2dword): Ditto.
(check_sword2qword): Ditto.

libstdc++: Refactor dejagnu effective-target checks

This introduces two new procs to replace boilerplate in the
effective-target checks.

libstdc++-v3/ChangeLog:

* testsuite/lib/libstdc++.exp (v3_try_preprocess): Define
new proc to preprocess a chunk of code.
(v3_check_preprocessor_condition): Define new proc to test
a preprocessor condition depending on GCC or libstdc++ macros.
(check_v3_target_debug_mode, check_v3_target_normal_mode):
Use v3_try_preprocess.
(check_v3_target_normal_namespace)
(check_v3_target_parallel_mode, check_v3_target_cstdint)
(check_v3_target_cmath, check_v3_target_atomic_builtins)
(check_v3_target_gthreads, check_v3_target_gthreads_timed)
(check_v3_target_sleep, check_v3_target_sched_yield)
(check_v3_target_string_conversions, check_v3_target_swprintf)
(check_v3_target_binary_io, check_v3_target_nprocs): Use
v3_check_preprocessor_condition.
(check_effective_target_cxx11): Likewise.
(check_effective_target_random_device): Likewise.
(check_effective_target_tbb-backend): Likewise.
(check_effective_target_futex): Likewise.
(check_v3_target_little_endian) Call check_effective_target_le.
(check_effective_target_atomic-builtins): New proc to define
new effective-target keyword.
(check_effective_target_gthreads-timed): Likewise.

INSTALL: Default to --enable-cet=auto

PR other/98027
* doc/install.texi: Default to --enable-cet=auto.

In 'gcc/omp-oacc-kernels-decompose.cc:flatten_binds', don't choke on empty GIMPLE sequence

Also, instead of just examining the first statement of inner 'GIMPLE_BIND' (via
'inner_sequence' being a 'typedef gimple *gimple_seq'), in fact examine all
statements contained therein, which I suppose must've been the intention here.

This "fixes" the testcase 'c-c++-common/goacc/kernels-decompose-ice-2.c' (which
now runs into the same ICE as 'c-c++-common/goacc/kernels-decompose-ice-1.c',
etc.).

gcc/
* omp-oacc-kernels-decompose.cc (flatten_binds): Don't choke on
empty GIMPLE sequence, and examine all statements contained in
inner 'GIMPLE_BIND'.
gcc/testsuite/
* c-c++-common/goacc/kernels-decompose-ice-1.c: Adjust.
* c-c++-common/goacc/kernels-decompose-ice-2.c: Likewise.

libstdc++: Fix -Wrange-loop-construct warnings in filesystem tests

Many tests do `for (const path& p : test_paths)` where test_paths is an
array of strings. To avoid -Wrange-loop-construct warnings the loop
variable should be an object, not a reference bound to a temporary.

libstdc++-v3/ChangeLog:

* testsuite/27_io/filesystem/operations/absolute.cc: Avoid
-Wrange-loop-construct warning.
* testsuite/27_io/filesystem/path/append/source.cc: Likewise.
* testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
* testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
* testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
* testsuite/27_io/filesystem/path/decompose/extension.cc:
Likewise.
* testsuite/27_io/filesystem/path/decompose/filename.cc:
Likewise.
* testsuite/27_io/filesystem/path/decompose/parent_path.cc:
Likewise.
* testsuite/27_io/filesystem/path/decompose/relative_path.cc:
Likewise.
* testsuite/27_io/filesystem/path/decompose/root_directory.cc:
Likewise.
* testsuite/27_io/filesystem/path/decompose/root_path.cc:
Likewise.
* testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
* testsuite/27_io/filesystem/path/modifiers/remove_filename.cc:
Likewise.
* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
Likewise.
* testsuite/27_io/filesystem/path/modifiers/replace_filename.cc:
Likewise.
* testsuite/27_io/filesystem/path/nonmember/append.cc: Likewise.
* testsuite/27_io/filesystem/path/nonmember/cmp.cc: Likewise.
* testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc:
Likewise.
* testsuite/27_io/filesystem/path/nonmember/hash_value.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_extension.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_filename.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_parent_path.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_relative_path.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_root_directory.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_root_name.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_root_path.cc:
Likewise.
* testsuite/27_io/filesystem/path/query/has_stem.cc: Likewise.
* testsuite/27_io/filesystem/path/query/is_relative.cc: Likewise.
* testsuite/experimental/filesystem/operations/absolute.cc:
Likewise.
* testsuite/experimental/filesystem/path/assign/copy.cc: Likewise.
* testsuite/experimental/filesystem/path/compare/path.cc:
Likewise.
* testsuite/experimental/filesystem/path/construct/copy.cc:
Likewise.
* testsuite/experimental/filesystem/path/decompose/extension.cc:
Likewise.
* testsuite/experimental/filesystem/path/decompose/filename.cc:
Likewise.
* testsuite/experimental/filesystem/path/decompose/parent_path.cc:
Likewise.
* testsuite/experimental/filesystem/path/decompose/relative_path.cc:
Likewise.
* testsuite/experimental/filesystem/path/decompose/root_directory.cc:
Likewise.
* testsuite/experimental/filesystem/path/decompose/root_path.cc:
Likewise.
* testsuite/experimental/filesystem/path/itr/traversal.cc:
Likewise.
* testsuite/experimental/filesystem/path/modifiers/remove_filename.cc:
Likewise.
* testsuite/experimental/filesystem/path/modifiers/replace_extension.cc:
Likewise.
* testsuite/experimental/filesystem/path/modifiers/replace_filename.cc:
Likewise.
* testsuite/experimental/filesystem/path/nonmember/hash_value.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_extension.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_filename.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_parent_path.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_relative_path.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_root_directory.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_root_name.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_root_path.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/has_stem.cc:
Likewise.
* testsuite/experimental/filesystem/path/query/is_relative.cc:
Likewise.

changelog: allow flexible "cherry picked" format.

It handles the following:
(cherry picked from commit c0c7270cc4efd896fe99f8ad5409dbef089a407f (testsuite changes only))

contrib/ChangeLog:

* gcc-changelog/git_commit.py: Use regex for cherry pick prefix.
* gcc-changelog/test_email.py: Test it.
* gcc-changelog/test_patches.txt: Likewise.

libstdc++: Partially revert r11-5314

The changes in r11-5314 are broken, because it means we don't use
__gthread_once for the first few initializations, but after the program
becomes multi-threaded we will repeat the initialization, using
__gthread_once once this time. This leads to memory errors.

The use of __is_single_threaded() in locale::id::_M_id() is OK, because
the side effects are the same either way.

libstdc++-v3/ChangeLog:

* src/c++98/locale.cc (locale::facet::_S_get_c_locale()):
Revert change to use __is_single_threaded.
* src/c++98/locale_init.cc (locale::_S_initialize()):
Likewise.

tree-optimization/98024 - fix rnflow regression

The change to make PRE insertion iterate less had a typo in checking
successors RPO state.  Fixing this exposes that regular PRE insertion
when facing a value that is the same on all edges inserts an
assignment in place of a PHI node but fails to set up things so that
this insertion is not repeated (it correctly does not return
'new_stuff').  But with the new iteration scheme this causes us
to repeatedly insert such assignment and change AVAIL_OUT over to
the newly inserted expression.  The fix is to treat this as PHI
and insert into PHI_GEN, avoiding repetitive insertion.

2020-11-27  Richard Biener  <rguenther@suse.de>

PR tree-optimization/98024
* tree-ssa-pre.c (insert): Fix successor RPO order check.
(do_pre_regular_insertion): When inserting an assignment
in place of an all-same-value PHI still record that into
PHI_GEN.

gfortran.dg/gomp/requires-4.f90: Fix !$omp clause

gcc/testsuite/
* gfortran.dg/gomp/requires-4.f90: Fix typo in '!$omp' clause.