[Bug testsuite/98964] New: FAIL: g++.dg/cpp0x/constexpr-52830.C -std=c++14 (test for excess errors)

[Bug testsuite/98964] New: FAIL: g++.dg/cpp0x/constexpr-52830.C -std=c++14 (test for excess errors)

[danglin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98964

            Bug ID: 98964
           Summary: FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (test
                    for excess errors)
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: danglin at gcc dot gnu.org
  Target Milestone: ---
              Host: hppa-unknown-linux-gnu
            Target: hppa-unknown-linux-gnu
             Build: hppa-unknown-linux-gnu

spawn -ignore SIGHUP /home/dave/gnu/gcc/objdir/gcc/testsuite/g++/../../xg++
-B/h
ome/dave/gnu/gcc/objdir/gcc/testsuite/g++/../../
/home/dave/gnu/gcc/gcc/gcc/test
suite/g++.dg/cpp0x/constexpr-52830.C -fdiagnostics-plain-output -nostdinc++
-I/h
ome/dave/gnu/gcc/objdir/hppa-linux-gnu/libstdc++-v3/include/hppa-linux-gnu
-I/ho
me/dave/gnu/gcc/objdir/hppa-linux-gnu/libstdc++-v3/include
-I/home/dave/gnu/gcc/
gcc/libstdc++-v3/libsupc++
-I/home/dave/gnu/gcc/gcc/libstdc++-v3/include/backward
-I/home/dave/gnu/gcc/gcc/libstdc++-v3/testsuite/util -fmessage-length=0
-std=c++14 -pedantic-errors -Wno-long-long -S -o constexpr-52830.s
/home/dave/gnu/gcc/gcc/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C:27:1:
error: no declaration matches 'void foo::func(T&&, typename eif<same<decltype
(a), int&&>::value>::type*)'
/home/dave/gnu/gcc/gcc/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C:21:8: note:
candidate is: 'template<class T> void foo::func(T&&, typename eif<same<decltype
(a), int&&>::value>::type*)'
/home/dave/gnu/gcc/gcc/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C:19:8: note:
'struct foo' defined here
compiler exited with status 1
XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (test for excess errors)
Excess errors:
/home/dave/gnu/gcc/gcc/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C:27:1:
error: no declaration matches 'void foo::func(T&&, typename eif<same<decltype
(a), int&&>::value>::type*)'

Similar fails:
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++2a (test for excess errors)

[Bug c++/98964] FAIL: g++.dg/cpp0x/constexpr-52830.C -std=c++14 (test for excess errors)

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98964

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
               Host|hppa-unknown-linux-gnu      |
          Component|testsuite                   |c++
     Ever confirmed|0                           |1
             Target|hppa-unknown-linux-gnu      |
              Build|hppa-unknown-linux-gnu      |
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-04-20

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
On Linux/x86-64, r11-8260 gave

./releases/gcc-11/r11-8260/bld/gcc/xgcc -B./releases/gcc-11/r11-8260/bld/gcc/
-S constexpr-52830.C 
constexpr-52830.C:27:1: error: no declaration matches ??void foo::func(T&&,
typename eif<same<decltype (a), int&&>::value>::type*)??
   27 | foo::
      | ^~~
constexpr-52830.C:21:8: note: candidate is: ??template<class T> void
foo::func(T&&, typename eif<same<decltype (a), int&&>::value>::type*)??
   21 |   void func(T && a,
      |        ^~~~
constexpr-52830.C:19:8: note: ??struct foo?? defined here
   19 | struct foo {
      |        ^~~
gnu-skx-1:pts/4[56]> ./releases/gcc-11/r11-8254/bld/gcc/xgcc
-B./releases/gcc-11/r11-8254/bld/gcc/ -S constexpr-52830.C
constexpr-52830.C:29:60: internal compiler error: canonical types differ for
identical types ??eif<same<decltype (a), int&&>::value>?? and
??eif<same<decltype (a), int&&>::value>??
   29 |      typename eif<same<decltype(a), int&&>::value>::type * )
      |                                                            ^
0xe0117d comptypes(tree_node*, tree_node*, int)
        ../../../gcc/gcc/cp/typeck.c:1558
0xe01353 same_type_ignoring_top_level_qualifiers_p(tree_node*, tree_node*)
        ../../../gcc/gcc/cp/typeck.c:1594
0xe005e0 structural_comptypes
        ../../../gcc/gcc/cp/typeck.c:1443
0xe010c4 comptypes(tree_node*, tree_node*, int)
        ../../../gcc/gcc/cp/typeck.c:1547
0xe0027e structural_comptypes
        ../../../gcc/gcc/cp/typeck.c:1401
0xe010c4 comptypes(tree_node*, tree_node*, int)
        ../../../gcc/gcc/cp/typeck.c:1547
0xe015d8 compparms(tree_node const*, tree_node const*)
        ../../../gcc/gcc/cp/typeck.c:1699
0xb72130 check_classfn(tree_node*, tree_node*, tree_node*)
        ../../../gcc/gcc/cp/decl2.c:686
0xb47ae5 grokfndecl
        ../../../gcc/gcc/cp/decl.c:10109
0xb5445c grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        ../../../gcc/gcc/cp/decl.c:13924
0xb6274b start_function(cp_decl_specifier_seq*, cp_declarator const*,
tree_node*)
        ../../../gcc/gcc/cp/decl.c:16859
0xcbe4d3 cp_parser_function_definition_from_specifiers_and_declarator
        ../../../gcc/gcc/cp/parser.c:29940
0xcad696 cp_parser_init_declarator
        ../../../gcc/gcc/cp/parser.c:21653
0xcbfdf6 cp_parser_single_declaration
        ../../../gcc/gcc/cp/parser.c:30564
0xcbea7b cp_parser_template_declaration_after_parameters
        ../../../gcc/gcc/cp/parser.c:30136
0xcbf9ef cp_parser_explicit_template_declaration
        ../../../gcc/gcc/cp/parser.c:30402
0xcbfa49 cp_parser_template_declaration_after_export
        ../../../gcc/gcc/cp/parser.c:30421
0xca3912 cp_parser_template_declaration
        ../../../gcc/gcc/cp/parser.c:16609
0xc9f1e0 cp_parser_declaration
        ../../../gcc/gcc/cp/parser.c:14085
0xc9f5f3 cp_parser_toplevel_declaration
        ../../../gcc/gcc/cp/parser.c:14183
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