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From: "reichelt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58706] New: ICE with lambda in OpenMP for-loop
Date: Sat, 12 Oct 2013 21:44:00 -0000
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X-Bugzilla-Version: 4.9.0
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58706

            Bug ID: 58706
           Summary: ICE with lambda in OpenMP for-loop
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

The following valid code snippet (compiled with "-std=c++11 -fopenmp") triggers
an ICE since GCC 4.5.0 (when lambdas were introduced):

===================================================
template<typename T> void foo()
{
#pragma omp for
  for (T i = [](){ return 0; }(); i < 10; ++i)
    ;
}

void bar()
{
  foo<int>();
}
===================================================

bug.cc: In instantiation of 'void foo() [with T = int]':
bug.cc:10:12:   required from here
bug.cc:3:9: internal compiler error: Segmentation fault
 #pragma omp for
         ^
0xb15dff crash_signal
        ../../gcc/gcc/toplev.c:335
0x6cabd2 contains_struct_check
        ../../gcc/gcc/tree.h:2787
0x6cabd2 finish_omp_for(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*, tree_node*, tree_node*, tree_node*, tree_node*)
        ../../gcc/gcc/cp/semantics.c:6321
0x5aae3d tsubst_expr
        ../../gcc/gcc/cp/pt.c:13596
0x5a9db7 tsubst_expr
        ../../gcc/gcc/cp/pt.c:13384
0x5a6d69 instantiate_decl(tree_node*, int, bool)
        ../../gcc/gcc/cp/pt.c:19603
0x5e4c6f instantiate_pending_templates(int)
        ../../gcc/gcc/cp/pt.c:19715
0x6204c6 cp_write_global_declarations()
        ../../gcc/gcc/cp/decl2.c:4121
Please submit a full bug report, [etc.]