https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120971

            Bug ID: 120971
           Summary: ICE on x86_64-linux-gnu: in omp_extract_for_data, at
                    omp-general.cc:423
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jiangchangwu at smail dot nju.edu.cn
  Target Milestone: ---

Compiler Explorer: https://gcc.godbolt.org/z/Mzb6ss8MK

*******************************************************************************
gcc version:
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++ --prefix=/home/software/gcc-trunk --enable-coverage
--disable-werror --enable-checking=yes
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20250613 (experimental) (GCC)

*******************************************************************************
Program:
$ cat mutant.c
enum a b;
enum a { c, d } e() {
#pragma omp for
  for (b = c; b < d; ++b)
    ;
}

*******************************************************************************
Command Lines:
$ gcc -fopenmp mutant.c
during GIMPLE pass: omplower
mutant.c: In function 'e':
mutant.c:3:9: internal compiler error: in omp_extract_for_data, at
omp-general.cc:423
    3 | #pragma omp for
      |         ^~~
0x5554b38 internal_error(char const*, ...)
        ../../gcc/gcc/diagnostic-global-context.cc:517
0x54d2d0a fancy_abort(char const*, int, char const*)
        ../../gcc/gcc/diagnostic.cc:1803
0x1d26ccb omp_extract_for_data(gomp_for*, omp_for_data*, omp_for_data_loop*)
        ../../gcc/gcc/omp-general.cc:423
0x1da98b8 lower_omp_for
        ../../gcc/gcc/omp-low.cc:11846
0x1dc5a4b lower_omp_1
        ../../gcc/gcc/omp-low.cc:14826
0x1dc7578 lower_omp
        ../../gcc/gcc/omp-low.cc:15038
0x1dc583e lower_omp_1
        ../../gcc/gcc/omp-low.cc:14810
0x1dc7578 lower_omp
        ../../gcc/gcc/omp-low.cc:15038
0x1dc7925 execute_lower_omp
        ../../gcc/gcc/omp-low.cc:15077
0x1dc7d4c execute
        ../../gcc/gcc/omp-low.cc:15131
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.

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