[Bug c++/78363] New: internal compiler error: in force_type_die, at dwarf2out.c:24864

[andrey.y.guskov at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78363

            Bug ID: 78363
           Summary: internal compiler error: in force_type_die, at
                    dwarf2out.c:24864
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrey.y.guskov at intel dot com
  Target Milestone: ---

Consider the following code snippet (a very abridged version of
libgomp/testsuite/libgomp.c++/pr58706.C):

int main() {
    int n = 0;

#pragma omp parallel for reduction (+: n)
    for (int i = [](){ return 3; }(); i < 10; ++i)
        n++;

  return n;
}

This is what happens when I attempt to compile it:

$ build_ext/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/<path>/build_ext/bin/g++
COLLECT_LTO_WRAPPER=/<path>/build_ext/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /<path>/source/configure --prefix=/<path>/build_ext
--with-system-zlib --with-demangler-in-ld --with-fpmath=sse --with-arch=haswell
--with-cpu=haswell --enable-shared --enable-host-shared --enable-clocale=gnu
--enable-cloog-backend=isl --enable-languages=c,c++,fortran,jit,lto
Thread model: posix
gcc version 7.0.0 20161115 (experimental) (GCC)

$ build_ext/bin/g++ fail.cpp -fopenmp –g
fail.cpp: In lambda function:
fail.cpp:6:34: internal compiler error: in force_type_die, at dwarf2out.c:24864
     for (int i = [](){ return 3; }(); i < 10; ++i)
                                  ^
0xa16d0e force_type_die
        /<path>/source/gcc/dwarf2out.c:24864
0xa16463 get_context_die
        /<path>/source/gcc/dwarf2out.c:24778
0xa16463 force_decl_die
        /<path>/source/gcc/dwarf2out.c:24797
0xa14078 gen_subprogram_die
        /<path>/source/gcc/dwarf2out.c:21722
0xa14e74 gen_decl_die
        /<path>/source/gcc/dwarf2out.c:25100
0xa15dfe dwarf2out_decl
        /<path>/source/gcc/dwarf2out.c:25607
0xa3312e dwarf2out_function_decl
        /<path>/source/gcc/dwarf2out.c:25622
0xa91dba rest_of_handle_final
        /<path>/source/gcc/final.c:4508
0xa91dba execute
        /<path>/source/gcc/final.c:4550
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Without the last ‘-g’ it compiles fine and returns 7, just as expected.