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* [Bug c++/100489] New: [10.3/11 REGRESSION] ICE in cp/constexpr.c:3556
@ 2021-05-08 21:41 slyfox at gcc dot gnu.org
  2021-05-09  1:08 ` [Bug c++/100489] [10.3/11/12 " hjl.tools at gmail dot com
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: slyfox at gcc dot gnu.org @ 2021-05-08 21:41 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100489

            Bug ID: 100489
           Summary: [10.3/11 REGRESSION] ICE in cp/constexpr.c:3556
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at gcc dot gnu.org
  Target Milestone: ---

It's a forward of https://bugs.gentoo.org/788829 ICE report by Martin Kolleck.

ICE appeared in 10.3.0 and is present in 11.1.0 and 12.0.0. 10.2.0 seems to
work.

Here is a simple reproducer:

// cat ice.cpp
union U
{
  struct
  {
    unsigned char a;
  };

  unsigned char b[1];
};

void f(unsigned char a)
{
  union U u = { .a = a };
}

And the crash:

$ LANG=C g++ -c -o /dev/null ice.cpp
ice.cpp: In function 'void f(unsigned char)':
ice.cpp:14:24: internal compiler error: in get_or_insert_ctor_field, at
cp/constexpr.c:3556
   14 |   union U u = { .a = a };
      |                        ^
0x5fed0e get_or_insert_ctor_field
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/constexpr.c:3556
0x68f2a2 cxx_eval_bare_aggregate
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/constexpr.c:4455
0x685466 cxx_eval_constant_expression
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/constexpr.c:6675
0x688030 cxx_eval_outermost_constant_expr
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/constexpr.c:7251
0x68b592 maybe_constant_value(tree_node*, tree_node*, bool)
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/constexpr.c:7525
0x6ab92c cp_fully_fold(tree_node*)
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/cp-gimplify.c:2146
0x6ab92c cp_fully_fold(tree_node*)
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/cp-gimplify.c:2138
0x6ab9d4 cp_fully_fold_init(tree_node*)
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/cp-gimplify.c:2167
0x82219a store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/typeck2.c:816
0x6bd08d check_initializer
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/decl.c:7080
0x6d6a8f cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/decl.c:8014
0x796139 cp_parser_init_declarator
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:21891
0x7730ae cp_parser_simple_declaration
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:14457
0x77509d cp_parser_declaration_statement
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:13592
0x7756ab cp_parser_statement
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:11822
0x776eae cp_parser_statement_seq_opt
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:12189
0x776f70 cp_parser_compound_statement
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:12138
0x794117 cp_parser_function_body
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:24080
0x794117 cp_parser_ctor_initializer_opt_and_function_body
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:24131
0x79541a cp_parser_function_definition_after_declarator
       
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/gcc/cp/parser.c:30068

$ LANG=C h gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/tmp/portage-tmpdir/portage/sys-devel/gcc-12.0.0_pre9999/work/gcc-12.0.0_pre9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/12.0.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/12.0.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/12.0.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/12.0.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/12.0.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/12.0.0/include/g++-v12
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/12.0.0/python
--enable-languages=c,c++,d,go,jit,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 12.0.0_pre9999 p1, commit
39671f87b2df6a1894cc11a161e4a7949d1ddccd' --disable-esp --enable-libstdcxx-time
--enable-host-shared --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --enable-systemtap
--enable-valgrind-annotations --enable-vtable-verify --with-zstd --enable-lto
--with-isl --disable-isl-version-check --enable-default-pie
--enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210420 (experimental) (Gentoo 12.0.0_pre9999 p1, commit
39671f87b2df6a1894cc11a161e4a7949d1ddccd)

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2021-05-08 21:41 [Bug c++/100489] New: [10.3/11 REGRESSION] ICE in cp/constexpr.c:3556 slyfox at gcc dot gnu.org
2021-05-09  1:08 ` [Bug c++/100489] [10.3/11/12 " hjl.tools at gmail dot com
2021-05-10  8:07 ` [Bug c++/100489] [10/11/12 Regression] " rguenth at gcc dot gnu.org
2021-05-19 23:55 ` jason at gcc dot gnu.org
2021-05-20 20:59 ` cvs-commit at gcc dot gnu.org
2021-05-20 20:59 ` cvs-commit at gcc dot gnu.org
2021-05-20 21:36 ` cvs-commit at gcc dot gnu.org
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