Jeff Law [Wed, 26 Jun 2019 21:36:27 +0000 (15:36 -0600)]
re PR tree-optimization/90883 (Generated code is worse if returned struct is unnamed)
PR tree-optimization/90883
* tree-ssa-alias.c (stmt_kills_ref_p): Handle BUILT_IN_CALLOC.
* tree-ssa-dse.c: Update various comments to distinguish between
dead and redundant stores.
(initialize_ao_ref_for_dse): Handle BUILT_IN_CALLOC.
(dse_optimize_redundant_stores): New function.
(delete_dead_or_redundant_call): Renamed from delete_dead_call.
Distinguish between dead and redundant calls in dump output. All
callers updated.
(delete_dead_or_redundant_assignment): Similarly for assignments.
(dse_optimize_stmt): Handle _CHK variants. For statements which
store 0 into multiple memory locations, try to prove a subsequent
store is redundant.
PR tree-optimization/90883
* g++.dg/tree-ssa/pr90883.C: New test.
* gcc.dg/tree-ssa/ssa-dse-36.c: New test.
Iain Sandoe [Wed, 26 Jun 2019 19:04:50 +0000 (19:04 +0000)]
[PATCH, PPC 2/2] Fix Darwin bootstrap after split of rs6000.c.
To fix this we need to make the branch islands (or code) visible between
both files. This keeps the generation side in rs6000.c and moves the
output routine to rs6000-logue.c, placing a reference to the islands
vector in rs6000-internal.h.
2019-06-26 Iain Sandoe <iain@sandoe.co.uk>
* config/rs6000/rs6000-internal.h (branch_island): New typedef.
(branch_islands): New extern.
* config/rs6000/rs6000-logue.c (macho_branch_islands): Moved from
* config/rs6000/rs6000.c: .. here.
Iain Sandoe [Wed, 26 Jun 2019 19:00:16 +0000 (19:00 +0000)]
[PATCH, PPC 1/2] Make sure the gt- files are built for all sub-targets.
The new gt-rs6000-logue.h is common to all sub-targets in the port, so
it needs to be added for them.
It seems better to place the common target_gtfiles in the powerpc*-*-*
section, rather than duplicating them in sub-targets. This would make it
less likely that a sub-target would be overlooked in any future file
introductions.
2019-06-26 Iain Sandoe <iain@sandoe.co.uk>
* config.gcc (powerpc*-*-linux*): Move target_gtfiles from here..
(powerpc*-*-*) ... to here.
Jonathan Wakely [Wed, 26 Jun 2019 14:38:23 +0000 (15:38 +0100)]
Add new helper traits for signed/unsigned integer types
Reuse the __is_one_of alias in additional places, and define traits to
check for signed/unsigned integer types so we don't have to duplicate
those checks elsewhere.
The additional overloads for std::byte in <bit> were reviewed by LEWG
and considered undesirable, so this patch removes them.
* include/bits/fs_path.h (path::__is_encoded_char): Use __is_one_of.
* include/std/bit (_If_is_unsigned_integer_type): Remove.
(_If_is_unsigned_integer): Use __is_unsigned_integer.
(rotl(byte, unsigned), rotr(byte, unsigned), countl_zero(byte))
(countl_one(byte), countr_zero(byte), countr_one(byte))
(popcount(byte), ispow2(byte), ceil2(byte), floor2(byte))
(log2p1(byte)): Remove.
* include/std/charconv (__detail::__is_one_of): Move to <type_traits>.
(__detail::__is_int_to_chars_type): Remove.
(__detail::__integer_to_chars_result_type): Use __is_signed_integer
and __is_unsigned_integer.
* include/std/type_traits (__is_one_of): Move here from <charconv>.
(__is_signed_integer, __is_unsigned_integer): New helpers.
* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Remove test for
std::byte overload.
* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Likewise.
* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Likewise.
* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Likewise.
* testsuite/26_numerics/bit/bitops.count/countl_one.cc: Likewise.
* testsuite/26_numerics/bit/bitops.count/countl_zero.cc: Likewise.
* testsuite/26_numerics/bit/bitops.count/countr_one.cc: Likewise.
* testsuite/26_numerics/bit/bitops.count/countr_zero.cc: Likewise.
* testsuite/26_numerics/bit/bitops.count/popcount.cc: Likewise.
* testsuite/26_numerics/bit/bitops.rot/rotl.cc: Likewise.
* testsuite/26_numerics/bit/bitops.rot/rotr.cc: Likewise.
Nathan Sidwell [Wed, 26 Jun 2019 12:58:39 +0000 (12:58 +0000)]
[PR preprocessor/90927] Fixe dependency output
https://gcc.gnu.org/ml/gcc-patches/2019-06/msg01664.html
libcpp/
PR preprocessor/90927
* mkdeps.c (mkdeps::vec::operator[]): Add non-const variant.
(deps_add_target): Deal with out of order unquoted targets.
/* Return true if the OFFSET is valid for the quad address instructions that
use d-form (register + offset) addressing. */
diff --git a/gcc/config/rs6000/rs6000-logue.c b/gcc/config/rs6000/rs6000-logue.c
index 9df4b5a..adc137b 100644
--- a/gcc/config/rs6000/rs6000-logue.c
+++ b/gcc/config/rs6000/rs6000-logue.c
@@ -4025,8 +4025,8 @@ rs6000_output_function_prologue (FILE *file)
/* -mprofile-kernel code calls mcount before the function prolog,
so a profiled leaf function should stay a leaf function. */
-static bool
-rs6000_keep_leaf_when_profiled ()
+bool
+rs6000_keep_leaf_when_profiled (void)
{
return TARGET_PROFILE_KERNEL;
}
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 3fc4029..bcfc881 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1338,7 +1338,6 @@ static bool rs6000_secondary_reload_move (enum rs6000_reg_type,
secondary_reload_info *,
bool);
rtl_opt_pass *make_pass_analyze_swaps (gcc::context*);
-static bool rs6000_keep_leaf_when_profiled () __attribute__ ((unused));
static tree rs6000_fold_builtin (tree, int, tree *, bool);
/* Hash table stuff for keeping track of TOC entries. */
--
1.8.3.1
Jakub Jelinek [Wed, 26 Jun 2019 08:26:18 +0000 (10:26 +0200)]
re PR target/90991 (_mm_loadu_ps instrinsic translates to vmovaps in combination with _mm512_insertf32x4)
PR target/90991
* config/i386/sse.md
(*<extract_type>_vinsert<shuffletype><extract_suf>_0): Use vmovupd,
vmovups, vmovdqu, vmovdqu32 or vmovdqu64 instead of the aligned
insns if operands[2] is misaligned_operand.
Li Jia He [Wed, 26 Jun 2019 08:23:06 +0000 (08:23 +0000)]
[RS6000] Change maddld match_operand from DI to GPR
From PowerPC ISA3.0, the description of `maddld RT, RA.RB, RC` is as follows:
64-bit RA and RB are multiplied and then the RC is signed extend to 128 bits,
and add them together.
We only apply it to 64-bit mode (DI) when implementing maddld. However, if we
can guarantee that the result of the maddld operation will be limited to 32-bit
mode (SI), we can still apply it to 32-bit mode (SI).
gcc/ChangeLog
2019-06-26 Li Jia He <helijia@linux.ibm.com>
* config/rs6000/rs6000.h (TARGET_MADDLD): Remove the restriction of
TARGET_POWERPC64.
* config/rs6000/rs6000.md (maddld): Change maddld match_operand from DI
to GPR.
gcc/testsuite/ChangeLog
2019-06-26 Li Jia He <helijia@linux.ibm.com>
Martin Liska [Wed, 26 Jun 2019 06:44:28 +0000 (08:44 +0200)]
Fix missing else keyword seen with clang-static-analyzer:
2019-06-26 Martin Liska <mliska@suse.cz>
* bb-reorder.c (connect_better_edge_p): Add missing else
statement in the middle of if-else statements.
/home/marxin/Programming/gcc/gcc/bb-reorder.c:1031:2: warning: Value stored to 'is_better_edge' is never read
is_better_edge = true;
^ ~~~~
/home/marxin/Programming/gcc/gcc/bb-reorder.c:1034:2: warning: Value stored to 'is_better_edge' is never read
is_better_edge = false;
^ ~~~~~
Jason Merrill [Wed, 26 Jun 2019 04:56:07 +0000 (00:56 -0400)]
PR c++/70462 - unnecessary base ctor variant with final.
As pointed out in the PR, we don't need base 'tor variants for a final
class, since it can never be a base. I tried also dropping complete
variants for abstract classes, but that runs into ABI compatibility problems
with older releases that refer to those symbols.
* optimize.c (populate_clone_array): Skip base variant if
CLASSTYPE_FINAL.
(maybe_clone_body): We don't need an alias if we are only defining
one clone.
Steven G. Kargl [Wed, 26 Jun 2019 04:31:14 +0000 (04:31 +0000)]
re PR fortran/90988 (Wrong error message with variables named "PUBLIC*")
2019-06-24 Steven G. Kargl <kargl@gcc.gnu.org>
PR Fortran/90988
* decl.c (access_attr_decl): Use temporary variable to reduce
unreadability of code. Normalize jumping to return.
(gfc_match_protected): Fix parsing error. Add comments to
explain code. Remove dead code.
(gfc_match_private): Use temporary variable to reduce unreadability
of code. Fix parsing error. Move code to test for blank PRIVATE.
Remove dead code.
(gfc_match_public): Move code to test for blank PUBLIC. Fix
parsing error. Remove dead code.
Ian Lance Taylor [Wed, 26 Jun 2019 00:17:32 +0000 (00:17 +0000)]
libgo/testsuite: ignore symbols with a leading dot in symtogo
On AIX, a function has two symbols, a text symbol (with a leading dot)
and a data one (without it).
As the tests must be run only once, only the data symbol can be used to
retrieve the final go symbol. Therefore, all symbols beginning with a dot
are ignored by symtogo.
Ian Lance Taylor [Wed, 26 Jun 2019 00:04:36 +0000 (00:04 +0000)]
cmd/go: silence ar with D flag failures
The first call of ar must not show its output in order to avoid useless
error messages about D flag.
The corresponding Go toolchain patch is CL 182077.
Iain Sandoe [Tue, 25 Jun 2019 20:11:11 +0000 (20:11 +0000)]
[Darwin, PPC] Move the out of line register save/restore to an endfile.
We have been including this in libgcc, which means that we have to append
-lgcc even when using shared libgcc. In preparation for revision of libgcc
split this into an endfile.
* config.host: Add libef_ppc.a to the extra files for powerpc-darwin.
* config/rs6000/t-darwin: (PPC_ENDFILE_SRC, PPC_ENDFILE_OBJS): New.
Build objects for the out of line save/restore register functions
so that they can be used for any supported Darwin version.
* config/t-darwin: Default the build Darwin version to Darwin8
(MacOS 10.4).
Bill Seurer [Tue, 25 Jun 2019 20:06:07 +0000 (20:06 +0000)]
[PATCH, rs6000] Split up rs6000.c.
The source file rs6000.c has grown to unreasonable size and is being
split up into several smaller source files. This should improve
compilation speed for building gcc.
This is the first of several patches to do this and moves most of the
prologue/epilogue code to a new source file.
Bootstrapped and tested on powerpc64le-unknown-linux-gnu and
powerpc64-unknown-linux-gnu with no regressions. Is this ok for trunk?
2019-06-24 Bill Seurer <seurer@linux.vnet.ibm.com>
Jonathan Wakely [Tue, 25 Jun 2019 13:18:36 +0000 (14:18 +0100)]
Fix non-portable use of std::abs(double) in constexpr function
Although libstdc++ adds 'constexpr' to its std::abs(floating-point)
overloads (as a non-conforming extension), those overloads are not used
if the target libc provides them, which is the case on Solaris.
The fix is to avoid std::abs and simply apply the negation when needed.
* include/std/numeric (midpoint(T, T)): Avoid std::abs in constexpr
function.
Implement alternate "__intN__" form of "__intN" type
gcc/ChangeLog:
* gcc/c-family/c-common.c (c_common_nodes_and_builtins): Define
alternate "__intN__" name for "__intN" types.
* gcc/c/c-parser.c (c_parse_init): Create keyword for "__intN__" type.
* gcc/cp/lex.c (init_reswords): Likewise.
* gcc/config/msp430/msp430.h: Use __int20__ for SIZE_TYPE and
PTRDIFF_TYPE.
* gcc/cp/cp-tree.h (cp_decl_specifier_seq): New bitfield "int_n_alt".
* gcc/c/c-decl.c (declspecs_add_type): Don't pedwarn about "__intN" ISO
C incompatibility if alternate "__intN__" form is used.
* gcc/cp/decl.c (grokdeclarator): Likewise.
* gcc/cp/parser.c (cp_parser_simple_type_specifier): Set
decl_specs->int_n_alt if "__intN__" form is used.
* gcc/gimple-ssa-sprintf.c (build_intmax_type_nodes): Accept "__intN__"
format of "__intN" types for UINTMAX_TYPE.
* gcc/brig/brig-lang.c (brig_build_c_type_nodes): Accept "__intN__"
format of "__intN" types for SIZE_TYPE.
* gcc/lto/lto-lang.c (lto_build_c_type_nodes): Likewise.
* gcc/stor-layout.c (initialize_sizetypes): Accept "__intN__"
format of "__intN" types for SIZETYPE.
* gcc/tree.c (build_common_tree_nodes): Accept "__intN__"
format of "__intN" types for SIZE_TYPE and PTRDIFF_TYPE.
* gcc/doc/invoke.texi: Document that __intN__ disables pedantic
warnings.
Jakub Jelinek [Tue, 25 Jun 2019 06:59:12 +0000 (08:59 +0200)]
pstl_config.h (_PSTL_PRAGMA_SIMD_SCAN, [...]): Define to OpenMP 5.0 pragmas even for GCC 10.0+.
* include/pstl/pstl_config.h (_PSTL_PRAGMA_SIMD_SCAN,
_PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN, _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN):
Define to OpenMP 5.0 pragmas even for GCC 10.0+.
(_PSTL_UDS_PRESENT): Define to 1 for GCC 10.0+.
Jan Hubicka [Mon, 24 Jun 2019 21:13:12 +0000 (23:13 +0200)]
ipa-utils.h (type_with_linkage_p): Verify that type is CXX_ODR_P.
* ipa-utils.h (type_with_linkage_p): Verify that type is
CXX_ODR_P.
(odr_type_p): Remove extra return.
* lto-streamer-out.c (hash_tree): Hash TYPE_CXX_ODR_P;
hash STRING_FLAG only for arrays and integers.
* tree-stremaer-in.c (unpack_ts_type_common_value_fields):
Update analogously.
* tree-streamer-out.c (pack_ts_type_common_value_fields):
Likewise.
* print-tree.c (print_node): Print cxx-odr-p
and string-flag.
* tree.c (need_assembler_name_p): Also check that type
is CXX_ODR_TYPE_P
(verify_type_variant): Update verification of SRING_FLAG;
also check CXX_ODR_P.
* tree.h (ARRAY_OR_INTEGER_TYPE_CHECK): New macro.
(TYPE_STRING_FLAG): Use it.
(TYPE_CXX_ODR_P): New macro.
* lto-common.c (compare_tree_sccs_1): Compare CXX_ODR_P;
compare STRING_FLAG only for arrays and integers.
* gcc-interface/decl.c (gnat_to_gnu_entity): Check that
type is array or integer prior checking string flag.
* gcc-interface/gigi.h (gnat_signed_type_for,
maybe_character_value): Likewise.
* c-common.c (braced_lists_to_strings): Check that
type is array or integer prior checking string flag.
* lex.c (cxx_make_type): Set TYPE_CXX_ODR_P.
* dwarf2out.c (gen_array_type_die): First check that type
is an array and then test string flag.
* trans-expr.c (gfc_conv_substring): Check that
type is array or integer prior checking string flag.
(gfc_conv_string_parameter): Likewise.
* trans-openmp.c (gfc_omp_scalar_p): Likewise.
* trans.c (gfc_build_array_ref): Likewise.
Iain Sandoe [Mon, 24 Jun 2019 19:13:01 +0000 (19:13 +0000)]
[Darwin, testsuite] Fix isystem-2.c.
For the test to succeed there needs to be some header that is to be found in
the 'expected' place i.e. <sysroot>/usr/include/. It's important that it is
not the name of a header for which fixincludes have been applied, since such
headers will be found in the gcc include-fixed dir and, in general, reference
additional headers. The dummy sysroot will prevent the additional headers
from being found, resulting in a failed test. The fix is to use a header name
that isn't expected to be present in a real sysroot.
2019-06-24 Iain Sandoe <iain@sandoe.co.uk>
* gcc.dg/cpp/isysroot-1.c (main): Use <example.h> as the test header.
* gcc.dg/cpp/usr/include/stdio.h: Rename...
* gcc.dg/cpp/usr/include/example.h: ... to this.
Ian Lance Taylor [Sun, 23 Jun 2019 22:10:19 +0000 (22:10 +0000)]
compiler: edit error messages to avoid -Wformat-diag warnings
GCC recently introduced -Wformat-diag to scrutinize GCC error messages.
It reports a number of warnings about gofrontend code, such as:
../../trunk/gcc/go/gofrontend/import.cc: In member function ‘Type* Import::type_for_index(int, const string&, size_t, bool*)’:
../../trunk/gcc/go/gofrontend/import.cc:1129:48: warning: unquoted operator ‘>=’ in format [-Wformat-diag]
1129 | "error in %s at %lu: bad type index %d >= %d",
| ^~
../../trunk/gcc/go/gofrontend/ast-dump.cc: In member function ‘void Ast_dump_context::dump(Gogo*, const char*)’:
../../trunk/gcc/go/gofrontend/ast-dump.cc:203:25: warning: unquoted option name ‘-fgo-dump-ast’ in format [-Wformat-diag]
203 | "cannot open %s:%m, -fgo-dump-ast ignored", dumpname.c_str());
| ^~~~~~~~~~~~~
../../trunk/gcc/go/gofrontend/expressions.cc: In static member function ‘static Bexpression* Func_expression::get_code_pointer(Gogo*, Named_object*, Location)’:
../../trunk/gcc/go/gofrontend/expressions.cc:1350:29: warning: misspelled term ‘builtin function’ in format; use ‘built-in function’ instead [-Wformat-diag]
1350 | "invalid use of special builtin function %qs; must be called",
| ^~~~~~~~~~~~~~~~
../../trunk/gcc/go/gofrontend/gogo.cc: In member function ‘void Gogo::add_linkname(const string&, bool, const string&, Location)’:
../../trunk/gcc/go/gofrontend/gogo.cc:2527:4: warning: unquoted sequence of 2 consecutive punctuation characters ‘//’ in format [-Wformat-diag]
2527 | ("%s is not a function; "
| ~^~~~~~~~~~~~~~~~~~~~~~~~
2528 | "//go:linkname is only supported for functions"),
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This CL edits error messages to avoid these warnings.
Ian Lance Taylor [Sun, 23 Jun 2019 22:04:53 +0000 (22:04 +0000)]
compiler: add go_debug and use it for debug messages
GCC recently added a new warning -Wformat-diag which does a lot of
rigorous checks on GCC diagnostic messages. This produces a number of
unnecessary diagnostics on gofrontend diagnostic output, such as
../../trunk/gcc/go/gofrontend/escape.cc: In member function ‘virtual int Escape_analysis_assign::statement(Block*, size_t*, Statement*)’:
../../trunk/gcc/go/gofrontend/escape.cc:1336:33: warning: spurious leading punctuation sequence ‘[’ in format [-Wformat-diag]
1336 | go_inform(s->location(), "[%d] %s esc: %s",
| ^
../../trunk/gcc/go/gofrontend/escape.cc: In member function ‘void Escape_analysis_assign::call(Call_expression*)’:
../../trunk/gcc/go/gofrontend/escape.cc:1964:17: warning: unquoted operator ‘::’ in format [-Wformat-diag]
1964 | "esccall:: indirect call <- %s, untracked",
| ^~
../../trunk/gcc/go/gofrontend/escape.cc:1964:34: warning: unbalanced punctuation character ‘<’ in format [-Wformat-diag]
1964 | "esccall:: indirect call <- %s, untracked",
| ^
Avoid these messages by adding a new function go_debug that uses only
printf formatting, not GCC diagnostic formatting, and change all the
optimization debugging messages to use it. None of the debugging
messages used the GCC diagnostic formatting specifiers anyhow.
Iain Sandoe [Sun, 23 Jun 2019 20:12:22 +0000 (20:12 +0000)]
[Darwin, PPC, testsuite] Fix pr80125 testcase for Darwin.
Darwin (unlike most of the members of the PowerPC port family)
defaults to signed chars, so the test was failing to compile with
a "mismatched parameters" error.
2019-06-23 Iain Sandoe <iain@sandoe.co.uk>
* gcc.target/powerpc/pr80125.c (foo): Use an unsigned char
vector explicitly for the vec_perm.
Iain Sandoe [Sun, 23 Jun 2019 19:23:51 +0000 (19:23 +0000)]
[Darwin, PPC] Handle GCC target pragma.
For compatibility with other members of the port.
Note, that we do not handle the longcall attribute, since longcall
is not required/used on current Darwin.
Iain Sandoe [Sun, 23 Jun 2019 18:56:21 +0000 (18:56 +0000)]
[Darwin, PPC, testsuite] Fix pr71785 testcase for Darwin.
Firstly, we adjust the test conditions to use non-PIC code for Darwin.
Secondly, we have to account for out-of-line GPR restores which gives
a false positive on one of the scan-assembler-not. Lastly, we make the
test a bit more specific for Darwin - that it looks for absence of
branches to local labels.
2019-06-23 Iain Sandoe <iain@sandoe.co.uk>
* gcc.target/powerpc/pr71785.c: For Darwin, make test non-PIC,
expect the out-of-line GPR restore, and test specifically for
absence of branches to local labels.
Jan Hubicka [Sat, 22 Jun 2019 15:32:51 +0000 (17:32 +0200)]
alias-access-path-6.c: New testcase.
* gcc.dg/tree-ssa/alias-access-path-6.c: New testcase.
* tree-ssa-alias.c (nonoverlapping_component_refs_p): Do not
give up on bitfields; continue searching for different refs
appearing later.
Marek Polacek [Sat, 22 Jun 2019 15:14:30 +0000 (15:14 +0000)]
PR c++/86476 - noexcept-specifier is a complete-class context.
PR c++/52869
* cp-tree.def (DEFAULT_ARG): Update commentary.
* cp-tree.h (UNPARSED_NOEXCEPT_SPEC_P): New macro.
(tree_default_arg): Use tree_base instead of tree_common.
(do_push_parm_decls, maybe_check_overriding_exception_spec): Declare.
* decl.c (do_push_parm_decls): New function, broken out of...
(store_parm_decls): ...here. Call it.
* except.c (nothrow_spec_p): Accept DEFAULT_ARG in the assert.
* parser.c (cp_parser_noexcept_specification_opt,
cp_parser_late_noexcept_specifier, noexcept_override_late_checks):
Forward-declare.
(unparsed_noexcepts): New macro.
(push_unparsed_function_queues): Update initializer.
(cp_parser_direct_declarator): Pass FRIEND_P to
cp_parser_exception_specification_opt.
(inject_parm_decls): New.
(pop_injected_parms): New.
(cp_parser_class_specifier_1): Implement delayed parsing of
noexcept-specifiers.
(cp_parser_save_noexcept): New.
(cp_parser_late_noexcept_specifier): New.
(noexcept_override_late_checks): New.
(cp_parser_noexcept_specification_opt): Add FRIEND_P parameter. Call
cp_parser_save_noexcept instead of the normal processing if needed.
(cp_parser_exception_specification_opt): Add FRIEND_P parameter and
pass it to cp_parser_noexcept_specification_opt.
(cp_parser_save_member_function_body): Fix comment.
(cp_parser_save_default_args): Maybe save the noexcept-specifier to
post process.
(cp_parser_transaction): Update call to
cp_parser_noexcept_specification_opt.
(cp_parser_transaction_expression): Likewise.
* parser.h (cp_unparsed_functions_entry): Add new field to carry
a noexcept-specifier.
* pt.c (dependent_type_p_r): Handle unparsed noexcept expression.
* search.c (maybe_check_overriding_exception_spec): New function, broken
out of...
(check_final_overrider): ...here. Call
maybe_check_overriding_exception_spec.
* tree.c (canonical_eh_spec): Handle UNPARSED_NOEXCEPT_SPEC_P.
(cp_tree_equal): Handle DEFAULT_ARG.
* g++.dg/cpp0x/noexcept45.C: New test.
* g++.dg/cpp0x/noexcept46.C: New test.
* g++.dg/cpp0x/noexcept47.C: New test.
* g++.dg/cpp0x/noexcept48.C: New test.
* g++.dg/cpp0x/noexcept49.C: New test.
* g++.dg/cpp0x/noexcept50.C: New test.
* g++.dg/cpp0x/noexcept51.C: New test.
* g++.dg/cpp0x/noexcept52.C: New test.
* g++.dg/cpp0x/noexcept53.C: New test.
* g++.dg/eh/shadow1.C: Adjust dg-error.