[Bug sanitizer/81460] New: [8 Regression] ICE in force_constant_size, at gimplify.c:684

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81460

            Bug ID: 81460
           Summary: [8 Regression] ICE in force_constant_size, at
                    gimplify.c:684
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at 
gcc dot gnu.org
  Target Milestone: ---

It's mine:

$ cat
/home/marxin/BIG/Programming/llvm-project/dragonegg/test/compilator/local/2007-02-16-VariableSizeStructArg.c
// RUN: %llvmgcc -S -w %s -o - 
// PR1170
int f(int a, struct {int b[a];} c) {  return c.b[0]; }

int g(struct {int b[1];} c) {
  return c.b[0];
}

$ ./xgcc -B.
/home/marxin/BIG/Programming/llvm-project/dragonegg/test/compilator/local/2007-02-16-VariableSizeStructArg.c
-fsanitize=address -c
/home/marxin/BIG/Programming/llvm-project/dragonegg/test/compilator/local/2007-02-16-VariableSizeStructArg.c:3:14:
warning: anonymous struct declared inside parameter list will not be visible
outside of this definition or declaration
 int f(int a, struct {int b[a];} c) {  return c.b[0]; }
              ^~~~~~
/home/marxin/BIG/Programming/llvm-project/dragonegg/test/compilator/local/2007-02-16-VariableSizeStructArg.c:5:7:
warning: anonymous struct declared inside parameter list will not be visible
outside of this definition or declaration
 int g(struct {int b[1];} c) {
       ^~~~~~
during GIMPLE pass: sanopt
/home/marxin/BIG/Programming/llvm-project/dragonegg/test/compilator/local/2007-02-16-VariableSizeStructArg.c:
In function ‘f’:
/home/marxin/BIG/Programming/llvm-project/dragonegg/test/compilator/local/2007-02-16-VariableSizeStructArg.c:3:5:
internal compiler error: in force_constant_size, at gimplify.c:684
 int f(int a, struct {int b[a];} c) {  return c.b[0]; }
     ^
0x907396 force_constant_size
        ../../gcc/gimplify.c:684
0x90df27 gimple_add_tmp_var(tree_node*)
        ../../gcc/gimplify.c:722
0xbd614e sanitize_rewrite_addressable_params
        ../../gcc/sanopt.c:910
0xbd69e4 execute
        ../../gcc/sanopt.c:1030