https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84576
--- Comment #5 from Vegard Nossum <vegard.nossum at gmail dot com> ---
I have another testcase which crashes in a similar way, but I'm not sure if
it's the same underlying bug or not:
void a() {
enum * {
[] (union {})
};
}
The original crash was:
(gdb) run
Starting program: xgcc -x c++ -std=c++14 -O3 -Wall -fpermissive -c input-1.cc
[New process 19395]
process 19395 is executing new program: cc1plus
input-1.cc:1:3: warning: ISO C++ forbids declaration of 'a' with no type
[-fpermissive]
a(){[](class{
^
input-1.cc: In function 'int a()':
input-1.cc:1:13: error: types may not be defined in parameter types
a(){[](class{
^
input-1.cc:1:13: error: expected '}' at end of input
input-1.cc:1:13: error: expected ',' or '...' at end of input
input-1.cc:1:14: error: expected ')' at end of input
a(){[](class{
~ ~^
)
Thread 2.1 "cc1plus" received signal SIGSEGV, Segmentation fault.
[Switching to process 19395]
0x000000000167a1f4 in ggc_internal_alloc (size=48, f=0x0, s=0, n=1) at
/home/vegard/git/gcc/gcc/ggc-page.c:1274
1274 entry = G.pages[order];
(gdb) bt
#0 0x000000000167a1f4 in ggc_internal_alloc (size=48, f=0x0, s=0, n=1) at
/home/vegard/git/gcc/gcc/ggc-page.c:1274
#1 0x0000000000000000 in ?? ()
The new one is:
(gdb) run
Starting program: xgcc -x c++ -std=c++14 -O3 -Wall -fpermissive -c input.cc
[New process 14133]
process 14133 is executing new program: cc1plus
input.cc: In function 'void a()':
input.cc:3:15: error: types may not be defined in parameter types
[] (union {})
^
Thread 2.1 "cc1plus" received signal SIGSEGV, Segmentation fault.
[Switching to process 14133]
0x00000000010529cd in dguide_name_p (name=0x7ffff6d5c000) at
/home/vegard/git/gcc/gcc/cp/pt.c:25423
25423 {
(gdb) bt
#0 0x00000000010529cd in dguide_name_p (name=0x7ffff6d5c000) at
/home/vegard/git/gcc/gcc/cp/pt.c:25423
#1 0x0000000000000000 in ?? ()
It crashes in a different place but they both have the "types may not be
defined in parameter types" error and I'm not sure why gdb is not able to
follow the stack properly.
