It triggers by checking with -Wbitwise on drivers/net/wireless/ipw2100.c
and net/sctp/sm_make_chunk.c
Reduced testcase:
-----------------------------------------------------
1 typedef int __attribute__((bitwise)) A;
2
3 void f(A a)
4 {
5 switch (a & 1) {
6 case 0:
7 break;
8 }
9 }
$ sparse -Wbitwise 1.c
1.c:5:12: error: incompatible types for operation (&)
Segmentation fault
-----------------------------------------------------
Recently added is_enum_type() call at evaluate.c:2670 gets NULL pointer.
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