libstdc++: Fix undefined behaviour in std::string

This fixes a ubsan error when constructing a string with a null pointer:

bits/basic_string.h:534:21: runtime error: applying non-zero offset 18446744073709551615 to null pointer

The _M_construct function only cares whether the second pointer is
non-null, so create a non-null value without undefined arithmetic.

We can also pass the random_access_iterator_tag directly to the
_M_construct function, to avoid going via the tag dispatching
_M_construct_aux, because we know we have pointers not integers here.

libstdc++-v3/ChangeLog:

* include/bits/basic_string.h (basic_string(const CharT*, const A&)):
Do not do arithmetic on null pointer.

libstdc++: Fix null dereference in pb_ds containers

This fixes ubsan errors:

ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp:533:15: runtime error: member access within null pointer of type 'struct entry'

libstdc++-v3/ChangeLog:

* include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp
(find_key_pointer(key_const_reference, false_type))
(find_key_pointer(key_const_reference, true_type)): Do not
dereference null pointer.

libstdc++ Fix undefined behaviour in testsuite

Fix some test bugs found by ubsan.

libstdc++-v3/ChangeLog:

* testsuite/20_util/from_chars/3.cc: Use unsigned type to avoid
overflow.
* testsuite/24_iterators/reverse_iterator/2.cc: Do not add
non-zero value to null pointer.
* testsuite/25_algorithms/copy_backward/move_iterators/69478.cc:
Use past-the-end iterator for result.
* testsuite/25_algorithms/move_backward/69478.cc: Likewise.
* testsuite/25_algorithms/move_backward/93872.cc: Likewise.

aix: encode function section

AIX XCOFF symbols can be labels or qualnames (names with an appended
mapping class).  CSECTs must be declared with a mapping class.
Within an assembler file, the symbol names with and without the mapping
class are unique.  An object file symbol table only presents the symbol
name without the mapping class, but the section of the symbol depends on
the mapping class.

The AIX XCOFF assembly language does not support first class aliases.
GCC implements symbol aliases by emitting additional labels for the function
or object.  When GCC encodes sections for a DECL, it must distinguish
between the primary definition and the aliases, which don't have a
mapping class encoding.

.globl foo[DS]
.globl .foo
.globl foo1
.globl .foo1
.csect foo[DS]
foo:
foo1:
.long .foo, TOC[tc0] 0
.csect .foo[PR]
.foo:
.foo1:

The CSECT foo[DS] and label foo are distinct.  foo1 is another label (alias)
for foo, and .foo1 is another label (alias) for .foo.  foo is the function
descriptor and .foo is the code.

This patch adds the [DS] mapping class to the encoding of FUNCTION_DECL
but ensures that mapping class is not added to function aliases.

rs6000_output_mi_thunk is updated to emit the function name that matches
the behavior of GCC final.c for normal functions: get_fnname_from_decl based
on the RTL name, not the DECL name.

* config/rs6000/rs6000-call.c (rs6000_output_mi_thunk): Use
get_fnname_from_decl for name of thunk.
* config/rs6000/rs6000.c (rs6000_declare_alias): Use assemble_name
and ASM_OUTPUT_LABEL.
(rs6000_xcoff_declare_function_name): Use assemble_name and
ASM_OUTPUT_LABEL.
(rs6000_xcoff_declare_object_name): Use ASM_OUTPUT_LABEL.
(rs6000_xcoff_encode_section_info): Don't add mapping class
for aliases.  Always add [DS] mapping class to primary
FUNCTION_DECL.
(rs6000_asm_weaken_decl): Don't explicitly add [DS].

PR middle-end/100307 - spurious -Wplacement-new with negative pointer offset

gcc/ChangeLog:

PR middle-end/100307
* builtins.c (compute_objsize_r): Clear base0 for pointers.

gcc/testsuite/ChangeLog:

PR middle-end/100307
* g++.dg/warn/Wplacement-new-size-9.C: New test.
* gcc.dg/tree-ssa/builtin-sprintf-warn-26.c: New test.

Adjust strings in dg-warning directives (PR testsuite/100412).

gcc/testsuite/ChangeLog:
* gcc.dg/Wvla-parameter-3.c: Use unique strings in directive names.

Adjust strings in dg-warning directives (PR testsuite/100412).

gcc/testsuite/ChangeLog:
* gcc.dg/Wvla-parameter-2.c: Use unique strings in directive names.

Make bfin-elf build again

gcc/
* config/bfin/bfin.h (NOTICE_UPDATE_CC): Remove.

s390/testsuite: Fix oscbreak-1.c.

Checking for an osc break is somewhat brittle especially with many
passes potentially introducing new insns and moving them around.
Therefore, only compile the test with -O1 -fschedule-insns in order
to limit the influence of other passes.

gcc/testsuite/ChangeLog:

* gcc.target/s390/oscbreak-1.c: Compile with -O1
-fschedule-insns

Remove CC0

This removes CC0 and all directly related infrastructure.

CC_STATUS, CC_STATUS_MDEP, CC_STATUS_MDEP_INIT, and NOTICE_UPDATE_CC
are deleted and poisoned.  CC0 is only deleted (some targets use that
name for something else).  HAVE_cc0 is automatically generated, and we
no longer will do that after this patch.

CC_STATUS_INIT is suggested in final.c to also be useful for ports that
are not CC0, and at least arm seems to use it for something.  So I am
leaving that alone, but most targets that have it could remove it.

2021-05-04  Segher Boessenkool  <segher@kernel.crashing.org>

* caller-save.c: Remove CC0.
* cfgcleanup.c: Remove CC0.
* cfgrtl.c: Remove CC0.
* combine.c: Remove CC0.
* compare-elim.c: Remove CC0.
* conditions.h: Remove CC0.
* config/h8300/h8300.h: Remove CC0.
* config/h8300/h8300-protos.h: Remove CC0.
* config/h8300/peepholes.md: Remove CC0.
* config/i386/x86-tune-sched.c: Remove CC0.
* config/m68k/m68k.c: Remove CC0.
* config/rl78/rl78.c: Remove CC0.
* config/sparc/sparc.c: Remove CC0.
* config/xtensa/xtensa.c: Remove CC0.
(gen_conditional_move):  Use pc_rtx instead of cc0_rtx in a piece of
RTL where that is used as a placeholder only.
* cprop.c: Remove CC0.
* cse.c: Remove CC0.
* cselib.c: Remove CC0.
* df-problems.c: Remove CC0.
* df-scan.c: Remove CC0.
* doc/md.texi: Remove CC0.  Adjust an example.
* doc/rtl.texi: Remove CC0.  Adjust an example.
* doc/tm.texi: Regenerate.
* doc/tm.texi.in: Remove CC0.
* emit-rtl.c: Remove CC0.
* final.c: Remove CC0.
* fwprop.c: Remove CC0.
* gcse-common.c: Remove CC0.
* gcse.c: Remove CC0.
* genattrtab.c: Remove CC0.
* genconfig.c: Remove CC0.
* genemit.c: Remove CC0.
* genextract.c: Remove CC0.
* gengenrtl.c: Remove CC0.
* genrecog.c: Remove CC0.
* haifa-sched.c: Remove CC0.
* ifcvt.c: Remove CC0.
* ira-costs.c: Remove CC0.
* ira.c: Remove CC0.
* jump.c: Remove CC0.
* loop-invariant.c: Remove CC0.
* lra-constraints.c: Remove CC0.
* lra-eliminations.c: Remove CC0.
* optabs.c: Remove CC0.
* postreload-gcse.c: Remove CC0.
* postreload.c: Remove CC0.
* print-rtl.c: Remove CC0.
* read-rtl-function.c: Remove CC0.
* reg-notes.def: Remove CC0.
* reg-stack.c: Remove CC0.
* reginfo.c: Remove CC0.
* regrename.c: Remove CC0.
* reload.c: Remove CC0.
* reload1.c: Remove CC0.
* reorg.c: Remove CC0.
* resource.c: Remove CC0.
* rtl.c: Remove CC0.
* rtl.def: Remove CC0.
* rtl.h: Remove CC0.
* rtlanal.c: Remove CC0.
* sched-deps.c: Remove CC0.
* sched-rgn.c: Remove CC0.
* shrink-wrap.c: Remove CC0.
* simplify-rtx.c: Remove CC0.
* system.h: Remove CC0.  Poison NOTICE_UPDATE_CC, CC_STATUS_MDEP_INIT,
CC_STATUS_MDEP, and CC_STATUS.
* target.def: Remove CC0.
* valtrack.c: Remove CC0.
* var-tracking.c: Remove CC0.

tree-optimization/100414 - compute dominance info in phiopt

phiopt now has dominator queries but fails to compute dominance
info.

2021-05-04  Richard Biener  <rguenther@suse.de>

PR tree-optimization/100414
* tree-ssa-phiopt.c (get_non_trapping): Do not compute dominance
info here.
(tree_ssa_phiopt_worker): But unconditionally here.

* gcc.dg/pr100414.c: New testcase.

OpenMP: Support complex/float in && and || reduction

C/C++ permit logical AND and logical OR also with floating-point or complex
arguments by doing an unequal zero comparison; the result is an 'int' with
value one or zero.  Hence, those are also permitted as reduction variable,
even though it is not the most sensible thing to do.

gcc/c/ChangeLog:

* c-typeck.c (c_finish_omp_clauses): Accept float + complex
for || and && reductions.

gcc/cp/ChangeLog:

* semantics.c (finish_omp_reduction_clause): Accept float + complex
for || and && reductions.

gcc/ChangeLog:

* omp-low.c (lower_rec_input_clauses, lower_reduction_clauses): Handle
&& and || with floating-point and complex arguments.

gcc/testsuite/ChangeLog:

* gcc.dg/gomp/clause-1.c: Use 'reduction(&:..)' instead of '...(&&:..)'.

libgomp/ChangeLog:

* testsuite/libgomp.c-c++-common/reduction-1.c: New test.
* testsuite/libgomp.c-c++-common/reduction-2.c: New test.
* testsuite/libgomp.c-c++-common/reduction-3.c: New test.

Replace AC_PROG_CC with AC_PROG_CC_C99 in top level configure file.

2021-05-04  Nick Clifton  <nickc@redhat.com>

* configure.ac (AC_PROG_CC): Replace with AC_PROG_CC_C99.
* configure: Regenerate.

libstdc++: Do not use deduced return type for std::visit [PR 100384]

This avoids errors outside the immediate context when std::visit is an
overload candidate because of ADL, but not actually viable.

The solution is to give std::visit a non-deduced return type. New
helpers are introduced for that, and existing ones refactored slightly.

libstdc++-v3/ChangeLog:

PR libstdc++/100384
* include/std/variant (__get_t): New alias template yielding the
return type of std::get<N> on a variant.
(__visit_result_t): New alias template yielding the result of
std::visit.
(__same_types): Move into namespace __detail::__variant.
(__check_visitor_results): Likewise. Use __invoke_result_t and
__get_t.
(__check_visitor_result): Remove.
(visit): Use __visit_result_t for return type.
* testsuite/20_util/variant/100384.cc: New test.

libstdc++: Remove _GLIBCXX_USE_INT128 autoconf macro

We don't need to decide whether to use __int128 when running configure,
we can do so at compilation time by seeing if __SIZEOF_INT128__ is
defined and if it's greater than __SIZEOF_LONG_LONG__.

This removes another unnecessary architecture-specific config macro in
<bits/c++config.h>, so the same header can work for 32-bit or 64-bit
compilation on AIX.

libstdc++-v3/ChangeLog:

* acinclude.m4 (GLIBCXX_ENABLE_INT128_FLOAT128): Remove
checks for __int128 and rename to GLIBCXX_ENABLE_FLOAT128.
* config.h.in: Regenerate.
* configure: Regenerate.
* configure.ac: Adjust to use GLIBCXX_ENABLE_FLOAT128.
* include/bits/random.h (_Select_uint_least_t<s, 1>):
Use __SIZEOF_INT128__ to decide whether to use __int128.
* include/std/charconv (__to_chars_unsigned_type): Likewise.

Reuse non-gimple_reg variable for inlining

When a call to a function is inlined and takes a parameter whose type is not
gimple_reg, a local variable is created in the caller to hold a copy of the
argument passed in the call with the following comment:

      /* We may produce non-gimple trees by adding NOPs or introduce
         invalid sharing when operand is not really constant.
         It is not big deal to prohibit constant propagation here as
         we will constant propagate in DOM1 pass anyway.  *

Of course the second sentence of the comment does not apply to non-gimple_reg
values, unless they get SRAed later, because we don't do constant propagation
for them.  This for example prevents two identical calls to a pure function
from being merged in the attached Ada testcase.

Therefore the attached patch attempts to reuse a read-only or non-addressable
local DECL of the caller, the hitch being that expand_call_inline needs to be
prevented from creating a CLOBBER for the case where it ends uo being reused.

gcc/
* tree-inline.c (insert_debug_decl_map): Delete.
(copy_debug_stmt): Minor tweak.
(setup_one_parameter): Do not use a variable if the value is either
a read-only DECL or a non-addressable local variable in the caller.
In this case, insert the debug-only variable in the map manually.
(expand_call_inline): Do not generate a CLOBBER for these values.
* tree-inline.h (debug_map): Minor tweak.

Fix libiberty link failures in LTO mode for MinGW

The test for the presence of variables (really symbols) does not work
when you add -Ox -flto to CFLAGS:

  for v in $vars; do
    AC_MSG_CHECKING([for $v])
    AC_CACHE_VAL(libiberty_cv_var_$v,
      [AC_LINK_IFELSE([AC_LANG_PROGRAM([[int *p;]],[[extern int $v [];
                                         p = $v;]])],
                      [eval "libiberty_cv_var_$v=yes"],
                      [eval "libiberty_cv_var_$v=no"])])
    if eval "test \"`echo '$libiberty_cv_var_'$v`\" = yes"; then
      AC_MSG_RESULT(yes)
      AC_DEFINE_UNQUOTED($n)
    else
      AC_MSG_RESULT(no)
    fi
  done

because the assignment to 'p' is optimized away by LTO.  This is visible
on MinGW platforms in the form of a link failure for sys_siglist.

There is another link failures for stpcpy: the symbol is both referenced
by libiberty's pex-win32.c and provided by libiberty's stpcpy.c, so it
needs to have a linkage to be resolved in LTO mode.

libiberty/
* configure.ac: Make test for variables more robust.
* configure: Regenerate.
gcc/
* builtins.c (builtin_with_linkage_p): Return true for stp[n]cpy.
* symtab.c (symtab_node::output_to_lto_symbol_table_p): Tidy up.

Restrict gcc.dg/tree-ssa/ssa-dse-26.c

This restricts the testcase to the target where it exposes the
situation fixed with g:e9d297a15d68121ba5bdd5a76ea71c1916180622
which targets BIT_FIELD_REFs created by fold_truth_andor.

This avoids strange dejagnu limits with overly long target lists
and simplifies the tests.

2021-05-04  Richard Biener  <rguenther@suse.de>

* gcc.dg/tree-ssa/ssa-dse-26.c: Skip on !lp64 targets,
simplify dump scanning down to one case.

tree-optimization/100329 - avoid reassociating asm goto defs

This avoids reassociating asm goto defs because we have no idea
on which outgoing edge to insert defs.

2021-05-04  Richard Biener  <rguenther@suse.de>

PR tree-optimization/100329
* tree-ssa-reassoc.c (can_reassociate_p): Do not reassociate
asm goto defs.
(insert_stmt_after): Assert we're not running into asm goto.

* gcc.dg/torture/pr100329.c: New testcase.

tree-optimization/100398 - avoid DSE of control flow stmt

The following makes sure to preserve control altering stmts
when removing trivially dead stmts in DSE.

2021-05-04  Richard Biener  <rguenther@suse.de>

PR tree-optimization/100398
* tree-ssa-dse.c (pass_dse::execute): Preserve control
altering stmts.

* gcc.dg/torture/pr100398.c: New testcase.

[Ada] Remove arbitrary and redundant qualification with Sinfo

gcc/ada/

* pprint.adb: Remove qualification of arbitrary calls to
Sinfo.Expressions and Sinfo.Parameter_Associations.

[Ada] Use function and not procedure UI_Image in pretty-printing

gcc/ada/

* pprint.adb (Expr_Name): Simplify with functional variant of
UI_Image.

[Ada] Reuse existing To_Mixed routine in pretty-printer

gcc/ada/

* pprint.adb (To_Mixed): Removed.

[Ada] Refine type of a counter variable from Integer to Natural

gcc/ada/

* pprint.adb (List_Name_Count): Change type from Integer to
Natural.

[Ada] Minor tweak in pretty-printing of expressions

gcc/ada/

* pprint.adb (Expression_Image): Special case for
expression-with-actions.

[Ada] Do not "optimize" by converting Positive to Unsigned

gcc/ada/

* exp_ch4.adb (Expand_Concatenate): Remove the non-optimization.

[Ada] Reuse First_Formal for generic subprograms

gcc/ada/

* lib-xref.adb (Generate_Reference_To_Formals): Remove dedicated
branch for generic subprograms (they are now handled together
with non-generic subprograms in the ELSE branch); replace a
low-level Ekind membership test with a high-level call to
Is_Access_Subprogram_Type.

[Ada] Fix inconsistent iteration with First_Formal and Next_Entity

gcc/ada/

* sem_ch12.adb (Check_Abstract_Primitives): Match First_Formal
with Next_Formal.
* sem_ch6.adb (Is_Non_Overriding_Operation): Likewise.

[Ada] Simplify iteration over formal parameters for Global/Depends check

gcc/ada/

* sem_prag.adb (Collect_Global_Item): Iterate directly over
formals.

[Ada] Fix handling of access-to-variable objects in Global and Depends

gcc/ada/

* sem_prag.ads (Collect_Subprogram_Inputs_Outputs): Update
comment; this routine is no longer used by GNATprove.
* sem_prag.adb (Find_Role): The IN parameter is on output only
when it belongs to non-function; also, the otherwise constant
object can only be written by a non-function.
(Collect_Global_Item): The IN parameter can only be written when
it belongs to non-function; also, unnest this check to make it
easier to read.

[Ada] Assert_Failure vs Assertion_Error

gcc/ada/

* libgnat/s-assert.ads (Assert_Failure): Now a renaming of
Assertion_Error.
* libgnat/a-assert.ads (Assertion_Error): Now a first class
citizen.  Remove dependency on System.Assertions.
* gcc-interface/a-assert.ads, gcc-interface/a-assert.adb: New.
* gcc-interface/Make-lang.in (GNAT_ADA_OBJS, GNATBIND_OBJS): Add
a-assert.o from gcc-interface.

[Ada] Move match function for pragma Warnings to public spec

gcc/ada/

* erroutc.adb (Matches): Move spec...
* erroutc.ads (Matches): ...here.

[Ada] Use error marker for messages in GNATprove mode

gcc/ada/

* gnat1drv.adb (Adjust_Global_Switches): Force error marker in
GNATprove mode.

[Ada] Clean up ??? marks

gcc/ada/

* binde.adb: No need for ??? marks in Binde, because it is
superseded by Bindo.
* bindo-writers.adb (Write_Unit_Closure): Verified that -Ra
works.
* exp_ch4.adb, sinfo.ads (Expand_N_Type_Conversion): Rules for
conversions passed to gigi are documented in sinfo.ads.
(Expand_N_Unchecked_Type_Conversion): Comment is a duplicate of
one in sinfo.ads.
(Expand_N_In): Robert already added sufficient comments years
after the ??? comment was inserted.
(Expand_Membership_Minimize_Eliminate_Overflow): I don't see any
reason why Stand should export Long_Long_Integer'Base -- it
doesn't export any other base types.
(Size_In_Storage_Elements): We are doing an allocator, so we
don't care about sizes in bits.
(Expand_N_Allocator): PolyORB isn't going to be significantly
improved, so we're not going to mess with remote access to
class-wide types.
(Optimize_Return_Stmt): It's not important to optimize return
statements in predicate functions -- there are many
more-important optimizations we could do. Keep part of the
comment without "???", to clarify why the "and then ...".
(User_Defined_Primitive_Equality_Op): The optimization doesn't
seem important enough.
(Expand_N_Unchecked_Type_Conversion): Refactor to use
Expand_N_Unchecked_Expression.
(Make_Array_Comparison_Op): This seems like a case of "it it's
not broken, don't fix it". Too much risk of causing bugs.
* debug_a.adb: Remove ??? comments asking why Current_Error_Node
is maintained unconditionally, and add a comment explaining why.
* errout.adb: These kinds of minor bugs do indeed exist, but
we're never going to get around to fixing them "properly", so we
need this code for robustness.
* gnatchop.adb (Read_File): Document when read can fail.
* gnatdll.adb (Parse_Command_Line): Nobody is complaining about
these arbitrary limits, so no need to use Table. Increase the
limits just in case.  It is clear from the names what they are
limits on.
* gnatlink.adb: Add needed comments.
(Delete): An existing comment makes clear it's intentional, and
it's been like that since 1996.
(Process_Args): Improve comments.
(Search_Library_Path): Refactoring to avoid deep nesting.
* inline.adb (Build_Body_To_Inline): Probably won't get around
to doing that optimization.
(Is_Unit_Subprogram): No, this should not be moved to Sem_Aux,
because it is too specialized to this context.
(Do_Reset): No comment is needed here; it's clear from the
comment on Reset_Dispatching_Calls. Do_Reset is an artificial
subprogram; if we had proper iterators, it would just be an if
statement in the loop.
(Rewrite_Function_Call): Probably won't get around to doing that
optimization.
* layout.adb (Layout_Type): The gigi comment doesn't need to be
a ??? comment, and it's been that way since 2000.  The
limitation to scalars will likely never be investigated, and
it's been that way since 2009.
* lib.adb (Check_Same_Extended_Unit): This doesn't look like
something that needs fixing; it looks like a permanent
workaround.
* lib-load.adb (Change_Main_Unit_To_Spec): It is good enough in
practice.
(Load_Unit): Nobody will ever get around to investigating the
obscure PMES oddity, and the optimization is not worth the
trouble.
* live.adb: It's not worth documenting this. It is used only
with a debug switch. Nobody who has done significant work on it
is still around, so it would require substantial investigation.
* mdll.ads: I see no reason for USE.
* namet.ads: Routines are obsolete, but they're not going
anywhere anytime soon (too much work, and surprisingly delicate
because of dependences on global variables).
* osint.ads: Minor.
* osint.adb: Improve comments.
(Full_Lib_File_Name): Use Smart_Find_File.

[Ada] Reuse Is_Formal_Object where convenient

gcc/ada/

* exp_prag.adb, sem_prag.adb: Replace low-level Ekind membership
tests with a high-level call to Is_Formal_Object.

[Ada] Address some ??? comments

gcc/ada/

* cstand.adb, sprint.adb, switch-c.adb, xr_tabls.ads,
xr_tabls.adb, xref_lib.adb: Address ??? comments.

[Ada] Reject constants of access-to-variable type as function globals

gcc/ada/

* sem_prag.adb (Analyze_Global_Item): Take subprogram kind into
account when accepting or rejecting a constant of an
access-to-variable type as a global Output/In_Out; do this check
inside an ELSIF branch to avoid unnecessary evaluation of the
subsequent condition.

[Ada] Simplify use of a global name buffer for Global/Depends errors

gcc/ada/

* sem_prag.adb (Role_Error, Usage_Error): Replace calls to
Name_Find and Get_Name_String with a call to To_String.

[Ada] Ongoing work for AI12-0212: container aggregates

gcc/ada/

* exp_aggr.adb (Build_Siz_Exp): new function, subsidiary of
Expand_Container_Aggregate, to create an expression to be used
in the dynamic allocation of a container with a single container
element association.
(Add_Range): Handle static bounds of ranges over enumerations.
(Expand_Container_Aggregate): Add declaration for size
expression when needed, and use it in container object
declaration for container.

[Ada] Missing finalization on generic instantiation

gcc/ada/

* exp_ch7.adb (Build_Finalizer_Helper.New_Finalizer_Name):
Unnest so that it can be reused.
(Build_Finalizer_Helper.Process_Declarations): Call the
xxx__finalize_body procedure of a package instantiation in case
it contains finalization statements.  Code clean ups.
(Build_Finalizer_Helper.Create_Finalizer): Export and set an
Interface_Name for library level finalizers since these may be
imported now.
(Build_Finalizer_Helper): Need to process library level package
body instantiations which may contain objects requiring
finalization.
* libgnat/s-finmas.ads: Fix typo.

[Ada] Address some ??? comments in checks.adb

gcc/ada/

* checks.adb (Append_Range_Checks, Apply_Selected_Length_Checks,
Determine_Range, Insert_Range_Checks,
Install_Null_Excluding_Check, Selected_Length_Checks,
Selected_Range_Checks): Address ??? comments and code cleanups.

[Ada] Reject formals of mode IN appearing as global outputs

gcc/ada/

* sem_prag.adb (Check_Mode_Restriction_In_Enclosing_Context):
Apply the rule even with no explicit Global contract (and remove
a dead condition for Refined_Global).

[Ada] Check entries for formals of mode IN appearing as global outputs

gcc/ada/

* sem_prag.adb (Check_Mode_Restriction_In_Enclosing_Context):
Extend check to protected entries.

[Ada] Fix reference to SPARK RM rule in comment

gcc/ada/

* sem_prag.adb (Check_Mode_Restriction_In_Enclosing_Context):
Fix reference to SPARK RM rule number.

[Ada] Preliminary cleanup in floating-point output implementation

gcc/ada/

* exp_intr.adb: Remove with/use clauses for Urealp.
(Expand_Is_Negative): Delete.
(Expand_Intrinsic_Call): Do not call it.
* rtsfind.ads (RE_Id): Remove RE_Float_Unsigned.
(RE_Unit_Table): Remove entry for RE_Float_Unsigned.
* snames.ads-tmpl (Name_Is_Negative): Delete.
* libgnat/s-imgrea.ads (Set_Image_Real): Fix mode of S parameter.
* libgnat/s-imgrea.adb: Add with/use clauses for System.Img_Util.
(LLU): New subtype.
(Maxdigs): Use it.
(Is_Negative): Reimplement.
(Image_Floating_Point): Simplify.
(Set_Image_Real): Fix mode of S parameter.  Remove the low-level
processing on characters.  Flip the sign of the Scale variable.
Compute the maximum number of digits for the straight notation.
Call Set_Decimal_Digits at the end to do the final formatting.
* libgnat/s-imguti.ads (Floating_Invalid_Value): New type.
(Set_Floating_Invalid_Value): New procedure.
* libgnat/s-imguti.adb (Set_Floating_Invalid_Value): Implement it
based on existing code from Set_Image_Real.
* libgnat/s-unstyp.ads (Float_Unsigned): Delete.

[Ada] Fix inconsistent handling of character set control switches

gcc/ada/

* csets.adb (Initialize): Refactor into CASE statement; raise
exception on unsupported code of character set (it will be
gently rejected earlier when scanning command line switches).
* switch-b.adb (Scan_Binder_Switches): Refactor into a
membership expression; add missing '9' choice; reorder as
described by GNAT UG, section 4.3.11.
* switch-c.adb (Scan_Front_End_Switches): Refactor into a
membership expression and reorder as above.
* doc/gnat_ugn/building_executable_programs_with_gnat.rst
(gnatic): Mention '5' as an allowed value for "c".
* gnat_ugn.texi: Regenerate.

[Ada] Guard against leading and trailing spaces reappearing in errors

gcc/ada/

* errout.adb (Error_Msg_Internal): Add assertion to prevent
style mistakes reappearing in the future.

[Ada] Wrong membership test computation for interface type

gcc/ada/

* exp_ch4.adb (Tagged_Membership): Remove wrong condition that
is not consistent with the documentation of this subprogram.

[Ada] Fix continuation message for missing ALL in access type

gcc/ada/

* sem_res.adb (Valid_Conversion): Make message a continuation.

[Ada] Address ??? comments in styleg.adb

gcc/ada/

* styleg.adb: Address ??? comments.

OpenMP/Fortran - fix pasto + testcase in depobj [PR100397]

gcc/fortran/ChangeLog:

PR testsuite/100397
* trans-openmp.c (gfc_trans_omp_depobj): Fix pasto in enum values.

libgomp/ChangeLog:

PR testsuite/100397
* testsuite/libgomp.fortran/depobj-1.f90 (dep2, dep3): Move var
declaration to scope of non-'depend'-guarded assignment to avoid races.

Fix typo in builtins.c.

gcc/ChangeLog:

2021-05-04  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

* builtins.c (try_store_by_multiple_pieces): Fix constfun's prototype.

introduce try store by multiple pieces

The ldist pass turns even very short loops into memset calls.  E.g.,
the TFmode emulation calls end with a loop of up to 3 iterations, to
zero out trailing words, and the loop distribution pass turns them
into calls of the memset builtin.

Though short constant-length clearing memsets are usually dealt with
efficiently, for non-constant-length ones, the options are setmemM, or
a function calls.

RISC-V doesn't have any setmemM pattern, so the loops above end up
"optimized" into memset calls, incurring not only the overhead of an
explicit call, but also discarding the information the compiler has
about the alignment of the destination, and that the length is a
multiple of the word alignment.

This patch handles variable lengths with multiple conditional
power-of-2-constant-sized stores-by-pieces, so as to reduce the
overhead of length compares.

It also changes the last copy-prop pass into ccp, so that pointer
alignment and length's nonzero bits are detected and made available
for the expander, even for ldist-introduced SSA_NAMEs.

for  gcc/ChangeLog

* builtins.c (try_store_by_multiple_pieces): New.
(expand_builtin_memset_args): Use it.  If target_char_cast
fails, proceed as for non-constant val.  Pass len's ctz to...
* expr.c (clear_storage_hints): ... this.  Try store by
multiple pieces after setmem.
(clear_storage): Adjust.
* expr.h (clear_storage_hints): Likewise.
(try_store_by_multiple_pieces): Declare.
* passes.def: Replace the last copy_prop with ccp.

Daily bump.

[openmp, simt] Disable SIMT for user-defined reduction

The test-case included in this patch contains this target region:
...
  for (int i0 = 0 ; i0 < N0 ; i0++ )
    counter_N0.i += 1;
...

When running with nvptx accelerator, the counter variable is expected to
be N0 after the region, but instead is N0 / 32.  The problem is that rather
than getting the result for all warp lanes, we get it for just one lane.

This is caused by the implementation of SIMT being incomplete.  It handles
regular reductions, but appearantly not user-defined reductions.

For now, handle this by disabling SIMT in this case, specifically by setting
sctx->max_vf to 1.

Tested libgomp on x86_64-linux with nvptx accelerator.

gcc/ChangeLog:

2021-05-03  Tom de Vries  <tdevries@suse.de>

PR target/100321
* omp-low.c (lower_rec_input_clauses): Disable SIMT for user-defined
reduction.

libgomp/ChangeLog:

2021-05-03  Tom de Vries  <tdevries@suse.de>

PR target/100321
* testsuite/libgomp.c/target-44.c: New test.

testsuite: Fix dg directives order in arm/aarch64 vml[as]_float_not_fused.c

dg-do must come before dg-skip-if, this patch fixes this oversight in
these two tests.

2021-05-03  Christophe Lyon  <christophe.lyon@linaro.org>

gcc/testsuite/
* gcc.target/aarch64/advsimd-intrinsics/vmla_float_not_fused.c:
Fix dg directives order.
* gcc.target/aarch64/advsimd-intrinsics/vmls_float_not_fused.c:
Likewise.

Fix expected output for nds32le and m32r

gcc/testsuite
* gcc.dg/tree-ssa/ssa-dse-26.c: Fix expected output for nds32le
and m32r.

c++: base-clause parsing and implicit 'this' [PR100362]

My r11-6815 change to defer access checking when processing a
base-clause removed a pair of pushclass / popclass calls that seemed to
be unnecessary now that we'd also defer access checking while parsing
the base-clause.

But it turns out these calls make a difference in the below testcase,
where we have a local class whose base-clause implicitly uses the 'this'
of the enclosing class.  Before r11-6815, while parsing the base-clause
of the local class, maybe_resolve_dummy would fail to resolve the dummy
'this' object because the current scope would be the local class.  Now,
since the current scope is the lambda, maybe_resolve_dummy succeeds and
returns the 'this' for the enclosing class Qux.  Later, during deferred
instantiation of the local class, we get confused trying to resolve the
access of 'a_' through this non-dummy 'this'.

So this patch just reinstates the calls to pushclass / popclass that
were removed in r11-6815.

gcc/cp/ChangeLog:

PR c++/100362
* parser.c (cp_parser_class_head): Reinstate calls to pushclass
and popclass when parsing the base-clause that were removed in
r11-6815.

gcc/testsuite/ChangeLog:

PR c++/100362
* g++.dg/cpp1y/lambda-generic-100362.C: New test.

c++: mark_used and ADL with template-id [PR100344]

My r11-295 patch for PR68942 didn't consider that the callee of an
ADL-eligible function call can be a TEMPLATE_ID_EXPR, and we don't want
to disable mark_used when substituting into the template arguments of
this TEMPLATE_ID_EXPR because the arguments are clearly used regardless
of the outcome of ADL.  In the first testcase below, this oversight
causes us to trip over the assert in build_call_a for the call to
find_index<int> because the function no longer had its TREE_USED bit set
from mark_used.

So this patch restricts the original fix to disable mark_used only when
the callee is a FUNCTION_DECL, which seems to be the only case that
matters for PR68942.  For instance, in the second testcase below we
already don't mark_used the deleted function specialization even before
r11-295.

gcc/cp/ChangeLog:

PR c++/68942
PR c++/100344
* pt.c (tsubst_copy_and_build) <case CALL_EXPR>: Set tf_conv
only when the callee is a FUNCTION_DECL.

gcc/testsuite/ChangeLog:

PR c++/68942
PR c++/100344
* g++.dg/template/call8.C: New test.
* g++.dg/template/koenig12a.C: New test.

Fix expected output for lm32 and bfin

gcc/testsuite
* gcc.dg/tree-ssa/ssa-dse-26.c: Fix expected output for bfin and lm32.

c++: Fix ICE with invalid requires-expression [PR100055]

This fixes a crash on invalid requires-expression: in this test,
current_template_parms is null so accessing TEMPLATE_PARMS_CONSTRAINTS
is going to fail.  So don't crash, but make sure we've complained
already.

gcc/cp/ChangeLog:

PR c++/100055
* decl.c (grokfndecl): Check current_template_parms.

gcc/testsuite/ChangeLog:

PR c++/100055
* g++.dg/concepts/diagnostic18.C: New test.

c++: Remove GCC12 FIXME for DR1312

This patch removes a FIXME I left for myself for GCC 12, along with
adjusting the relevant test.

gcc/cp/ChangeLog:

DR 1312
* constexpr.c (cxx_eval_constant_expression): Don't check
integer_zerop.

gcc/testsuite/ChangeLog:

DR 1312
* g++.dg/cpp0x/constexpr-cast2.C: Remove XFAILs.

Fix xstormy16 selector

gcc/testsuite
* gcc.dg/tree-ssa/ssa-dse-26.c: Fix xstormy selector.

Fix test results on rx

gcc/testsuite
* gcc.dg/tree-ssa/ssa-dse-26.c: Update expected output for rx too.

Fix test results on or1k

gcc/testsuite
* gcc.dg/tree-ssa/ssa-dse-26.c: Update expected output for or1k too.

Fix test results on cr16 and xstormy16

gcc/testsuite
* gcc.dg/tree-ssa/ssa-dse-26.c: Update expected output for
cr16 and xstormy16 targets.

Improve PHI handling in DSE

This improves handling of PHI defs when walking uses in
dse_classify_store to track two PHI defs.  This happens
when there are CFG merges and one PHI feeds into another.
If we decide to want more then using a sbitmap for this might be
the way to go.

2021-05-03  Richard Biener  <rguenther@suse.de>

* tree-ssa-dse.c (dse_classify_store): Track two PHI defs.

* gcc.dg/tree-ssa/ssa-dse-42.c: New testcase.
* gcc.dg/pr81192.c: Disable DSE.

Perform reverse program order walk for GIMPLE DSE

The following changes the post-dominator domwalk done by GIMPLE DSE
to a reverse program order walk.  This enables 2% more stmts do be
DSEd during bootstrap and in particular for testcases like the one
added where it is important to visit post dominators in a particular
order.

2021-05-03  Richard Biener  <rguenther@suse.de>

* tree-ssa-dse.c: Do not include domwalk.h but cfganal.h.
(dse_dom_walker): Remove.
(dse_dom_walker::dse_optimize_stmt): Rename...
(dse_optimize_stmt): ... to this, pass in live_bytes sbitmap.
(dse_dom_walker::before_dom_children): Inline ...
(pass_dse::execute): ... here.  Perform a reverse program
order walk.

* gcc.dg/tree-ssa/ssa-dse-41.c: New testcase.

GCC_CET_HOST_FLAGS: Check if host supports multi-byte NOPs

Check if host supports multi-byte NOPs before enabling CET on host.

gcc/

PR bootstrap/99703
* configure: Regenerated.

libbacktrace/

PR bootstrap/99703
* configure: Regenerated.

libcc1/

PR bootstrap/99703
* configure: Regenerated.

libcpp/

PR bootstrap/99703
* configure: Regenerated.

libdecnumber/

PR bootstrap/99703
* configure: Regenerated.

lto-plugin/

PR bootstrap/99703
* configure: Regenerated.

GCC_CET_HOST_FLAGS: Check if host supports multi-byte NOPs

Sync with binutils for PR binutils/27397.  Check if host supports
multi-byte NOPs before enabling CET on host.

config/

PR bootstrap/99703
* cet.m4 (GCC_CET_HOST_FLAGS): Check if host supports multi-byte
NOPs.

libiberty/

PR bootstrap/99703
* configure: Regenerated.

IBM Z: Handle hard registers in s390_md_asm_adjust()

gen_fprx2_to_tf() and gen_tf_to_fprx2() cannot handle hard registers,
since the subregs they create do not pass validation.  Change
s390_md_asm_adjust() to manually copy between hard VRs and FPRs instead
of using these two functions.

gcc/ChangeLog:

PR target/100217
* config/s390/s390.c (s390_hard_fp_reg_p): New function.
(s390_md_asm_adjust): Handle hard registers.

gcc/testsuite/ChangeLog:

PR target/100217
* gcc.target/s390/vector/long-double-asm-in-out-hard-fp-reg.c: New test.
* gcc.target/s390/vector/long-double-asm-inout-hard-fp-reg.c: New test.

tree-ssa-dse: Fix up go.test/test/fixedbugs/issue16095.go miscompilation [PR100382]

The new DCE code inside of tree DSE removes in -fnon-call-exceptions
go code a load from NULL pointer the testcase relies on throwing an
exception and so the test hangs.

The following patch just repeats a check that e.g. tree-ssa-dce.c
uses to prevent this.

2021-05-03  Jakub Jelinek  <jakub@redhat.com>

PR tree-optimization/100382
* tree-ssa-dse.c: Include tree-eh.h.
(dse_dom_walker::before_dom_children): Don't remove stmts if
stmt_unremovable_because_of_non_call_eh_p is true.

[Ada] Ada.Strings.Unbounded.Aux.Set_String

gcc/ada/

* libgnat/a-stunau.ads, libgnat/a-stunau.adb,
libgnat/a-stunau__shared.adb (Set_String): Remove old version,
replace by a new version taking a callback to set the string.

[Ada] Missing Preelaborate_Initialization on Ada.Containers.Ordered_Maps.Map

gcc/ada/

* libgnat/a-coorma.ads (Map): Add missing
Preelaborate_Initialization.

[Ada] Reuse Is_Universal_Numeric_Type where possible

gcc/ada/

* exp_ch4.adb (Analyze_Number_Declaration, Expand_N_Op_Expon):
Simplify with Is_Universal_Numeric_Type.
* sem_attr.adb (Resolve_Attribute): Likewise.
* sem_ch3.adb: Likewise.
* sem_ch4.adb (Check_Common_Type, Check_Arithmetic_Pair):
Likewise.
* sem_eval.adb (Eval_Unary_Op, Test_In_Range): Likewise.
* sem_res.adb (Resolve_Arithmetic_Op, Resolve_Membership_Op,
Resolve_Op_Expon, Resolve_Unary_Op, Set_Mixed_Mode_Operand,
Set_Operand_Type): Likewise.
* sem_type.adb (Disambiguate, Find_Unique_Type): Likewise.
* sem_util.adb (Universal_Interpretation): Likewise.

[Ada] Minor style fixes in Max_Aggregate_Size

gcc/ada/

* exp_aggr.adb (Max_Aggregate_Size): Add header boxes for nested
routines; move a local constant after nested subprogram bodies;
refill comment.

[Ada] Reuse a wrapper for Resolve with implicit type where possible

gcc/ada/

* sem_attr.adb (Analyze_Attribute): Reuse Resolve with implicit
type when analysing attribute Priority.
* sem_ch5.adb (Analyze_Case_Statement): Likewise for a rare case
in analysis of case statements.
(Analyze_Iterator_Specification): Likewise for non-overloaded
domain of iteration.

[Ada] Replace low-level membership test with a high-level Is_Record_Type

gcc/ada/

* einfo.adb (Write_Entity_Info): Simplify an Ekind membership
test.
* exp_aggr.adb (Is_CCG_Supported_Aggregate): Likewise.

[Ada] Refine type of a counter object from Int to Nat

gcc/ada/

* exp_ch7.adb (Build_Finalize_Statements): Refine type of a
local counter variable.
* exp_dist.adb (Append_Record_Traversal): Refine type of Counter
parameter.
(Add_Process_Element): Likewise.
(Build_From_Any_Call): Refine type of a local counter variable.
(Build_From_Any_Function): Likewise.
(Build_To_Any_Function): Likewise.
(FA_Rec_Add_Process_Element): Likewise.
(TA_Append_Record_Traversal): Likewise.
(TA_Rec_Add_Process_Element): Likewise.

[Ada] Simplify implicit loading for GNATprove with Discard_Node

gcc/ada/

* rtsfind.adb (SPARK_Implicit_Load): Simplify with Discard_Node.

[Ada] Update copyright notice

gcc/ada/

* Makefile.rtl: Update copyright notice.
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* gcc-interface/gadaint.h: Likewise.
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* get_scos.adb: Likewise.
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* initialize.c: Likewise.
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* par-tchk.adb: Likewise.
* par-util.adb: Likewise.
* par.adb: Likewise.
* par.ads: Likewise.
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* prepcomp.ads: Likewise.
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* put_scos.ads: Likewise.
* raise-gcc.c: Likewise.
* raise.c: Likewise.
* raise.h: Likewise.
* repinfo-input.adb: Likewise.
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* repinfo.adb: Likewise.
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* repinfo.h: Likewise.
* restrict.adb: Likewise.
* restrict.ads: Likewise.
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* rtfinal.c: Likewise.
* rtinit.c: Likewise.
* rtsfind.adb: Likewise.
* rtsfind.ads: Likewise.
* runtime.h: Likewise.
* s-oscons-tmplt.c: Likewise.
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* sem.ads: Likewise.
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[Ada] Remove unused initial values in expansion of distributed calls

gcc/ada/

* exp_dist.adb (Build_From_Any_Call): Remove initial value for
Fnam; fix style.
(Build_To_Any_Call): Remove initial value for Fnam.
(Build_TypeCode_Call): Likewise.

[Ada] Replace calls to RTE with Is_RTE where possible

gcc/ada/

* checks.adb, exp_aggr.adb, exp_attr.adb, exp_ch6.adb,
exp_disp.adb, exp_imgv.adb, exp_util.adb, sem_attr.adb,
sem_ch13.adb, sem_ch8.adb, sem_eval.adb, sem_scil.adb,
sem_util.adb: Replace calls to RTE with Is_RTE.

[Ada] Replace call with a reference to a local constant

gcc/ada/

* sem_ch4.adb (Try_Object_Operation): Reuse local constant.

[Ada] Error message on invalid prefixed procedure call

gcc/ada/

* sem_ch4.adb (Try_Object_Operation): When a prefixed call is
overloaded and illegal, and the All_Errors flag is off, generate
an error message if the re-analysis of some candidate
interpretation fails to produce one.

[Ada] Rename package instead of each routine

gcc/ada/

* libgnat/g-casuti.adb: Replace with "pragma No_Body".
* libgnat/g-casuti.ads: Replace with a package renaming.

[Ada] Fix attributes Version and Body_Version for concurrent units

gcc/ada/

* sem_attr.adb (Check_Program_Unit): Fix references to
Concurrent_Kind and Is_Concurrent_Type; avoid repeated calls to
Entity.

[Ada] Allow attributes Version and Body_Version prefixed by entries

gcc/ada/

* sem_attr.adb (Check_Program_Unit): Replace tests for Task_Kind
and Protected_Kind with a collective test for Concurrent_Kind;
likewise, replace calls to Is_Task_Type and Is_Protected_Type
with a collective call to Is_Concurrent_Type; simplify into a
single membership test; add missing Entry_Kind alternative.

[Ada] Fix typos in calls to Error_Msg_NE

gcc/ada/

* sem_aggr.adb (Resolve_Record_Aggregate): Fix casing in error
message.
* sem_ch3.adb (Add_Internal_Interface_Entities): Fix unbalanced
parens.
* sem_elim.adb (Eliminate_Error_Msg): Add insertion character.

[Ada] Fix calls to Error_Msg_NE instead of Error_Msg_N

gcc/ada/

* freeze.adb (Freeze_Profile): Replace Error_Msg_NE with
Error_Msg_N; change to continuation message.
* sem_cat.adb, sem_ch10.adb, sem_ch12.adb, sem_ch5.adb: Replace
calls to Error_Msg_NE with calls to Error_Msg_N.

[Ada] Remove leading and trailing spaces in error messages

gcc/ada/

* exp_disp.adb, sem_aggr.adb, sem_cat.adb, sem_ch10.adb,
sem_ch12.adb, sem_ch3.adb, sem_ch4.adb, sem_ch5.adb,
sem_ch6.adb, sem_ch8.adb, sem_ch9.adb, sem_prag.adb,
sem_res.adb: Remove extra leading and trailing space in error
messages.

[Ada] Remove confusing warning on type export

gcc/ada/

* sem_prag.adb (Set_Exported): Do not warn on exporting a type.

[Ada] Spurious warning about premature use of selected component

gcc/ada/

* sem_warn.adb (Check_References): Do not emit warning on a
selected component when enclosing type has no discriminant and
type of component has partial initialization.

[Ada] Expansion in _postconditions confusing CodePeer

gcc/ada/

* contracts.adb (Build_Postconditions_Procedure): Remove
internally generated if statement used to control finalization
actions.
* exp_ch6.adb (Add_Return, Expand_Non_Function_Return,
Expand_Simple_Function_Return): Add if statement around
_postconditions to control finalization.
* exp_ch7.adb (Build_Finalizer): Likewise.
* sem_prag.adb (Find_Related_Declaration_Or_Body): Add case to
handle Context itself being a handled sequence of statements.

[Ada] Spurious accessibility error on call in return statement

gcc/ada/

* sem_util.adb (In_Return_Value): Modified to detect when
implicit dereference is specified on the return type of a
function call within the expression being checked.

[Ada] Crash on aggregate in function call in object declaration

gcc/ada/

* exp_aggr.adb (Expand_Array_Aggregate): If the parent node of
the aggregate is a subprogram call there is no target in which
to build the aggregate, and it has to be expanded into component
assignments.

[Ada] Code and style cleanups for CUDA

gcc/ada/

* exp_prag.adb (Expand_Pragma_CUDA_Execute): Refill comments;
remove periods after single-line comments; use procedural
variant of Next_Entity.
* gnat_cuda.adb: Refill comments; remove periods after
single-line comments; replace calls to UI_From_Int with
constants; change iteration bounds so they match the comments.
* sem_prag.adb (Analyze_Pragma): Add checks for malformed pragma
CUDA_Kernel aggregate; simplify processing of pragma CUDA_Global
with Check_Arg_Count; sync comment with code for CUDA_Global.

[Ada] No_Implicit_Loops restriction and pragma Assert

gcc/ada/

* tbuild.adb (Make_Implicit_Loop_Statement): Disable restriction
checking on dead paths.

[Ada] Spurious warning on postcondition and result

gcc/ada/

* sem_util.adb (Check_Result_And_Post_State): Replace custom
Has_In_Out_Parameter with existing Has_Out_Or_In_Out_Parameter
flag which corresponds exactly to what we need.

[Ada] Code cleanup

gcc/ada/

* libgnat/a-ztcoio.adb: Remove unused with clause.