https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120563
Bug ID: 120563
Summary: ICE: tree check: expected class ‘type’, have
‘exceptional’ (error_mark) in
c_parser_omp_clause_reduction, at c/c-parser.cc:18549
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: iamanonymous.cs at gmail dot com
Target Milestone: ---
Target: x86_64
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The compiler produces an internal error during tree_class_check_failed when
compiling the provided code with the specified options.
The issue can also be reproduced on Compiler Explorer.
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OS and Platform:
# uname -a
Linux ubuntu 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023
x86_64 x86_64 x86_64 GNU/Linux
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# g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/root/gdbtest/gcc/gcc-250601/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/root/gdbtest/gcc/gcc-250601
--enable-languages=c,c++ --disable-multilib --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20250601 (experimental) (GCC)
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Program:
#cat code.c
#pragma omp declare reduction (+: struct S : merge (&omp_out, &omp_in))
initializer (init (&omp_priv))
void
foo (struct S x)
{
#pragma omp taskgroup task_reduction (+: x)
{
#pragma omp task in_reduction (+: x)
{
x.a++;
x.b++;
}
#pragma omp task in_reduction (+: x)
{
x.a += 4;
x.b += 14;
}
#pragma omp task in_reduction (+: x)
{
x.a += 9;
x.b += 19;
}
}
if (x.a != 56 || x.b != 86)
__builtin_abort ();
}
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Command Lines:
gcc code.c -pipe -MMD -MP -MQ ./ -MT test.o -MF test.d -c -o code_0.o
<source>: In function 'omp declare reduction +':
<source>:1:46: error: implicit declaration of function 'merge'
[-Wimplicit-function-declaration]
1 | #pragma omp declare reduction (+: struct S : merge (&omp_out, &omp_in))
initializer (init (&omp_priv))
| ^~~~~
<source>:1:86: error: implicit declaration of function 'init'
[-Wimplicit-function-declaration]
1 | #pragma omp declare reduction (+: struct S : merge (&omp_out, &omp_in))
initializer (init (&omp_priv))
|
^~~~
<source>: At top level:
<source>:4:15: error: parameter 1 ('x') has incomplete type
4 | foo (struct S x)
| ~~~~~~~~~^
<source>: In function 'foo':
<source>:6:11: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in c_parser_omp_clause_reduction, at
c/c-parser.cc:18685
6 | #pragma omp taskgroup task_reduction (+: x)
| ^~~
0x2505575 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x2526e26 internal_error(char const*, ...)
???:0
0x8fdebb tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
???:0
0xac1cbe c_parse_file()
???:0
0xb433d9 c_common_parse_file()
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
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Also ICE on trunk, compiler explorer:https://gcc.godbolt.org/z/d6h3n1KKn
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