https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120257
Bug ID: 120257
Summary: ICE (Segfault) when expanding deeply nested macros
with constructor calls (std::string) since 15.1
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mario.rodriguezb1 at um dot es
Target Milestone: ---
It seems to be a very specific problem, any modification in the code leads to
the expected behaviour, which is "Killed - processing time exceeded". It
happens in 15.1 and trunk
```
#include <iostream>
using namespace std;
#define NESTED(X) X(X(X(X(X(X
#define NESTED2(X) NESTED(X)
#define NESTED3(X) NESTED(NESTED2(X))
#define NESTED4(X) NESTED(NESTED3(X))
#define NESTED5(X) NESTED(NESTED4(X))
#define NESTED6(X) NESTED(NESTED5(X))
int main(int argc, char* argv[])
{
NESTED6(string) x(2);
return 0;
}
```
```
g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 4
```
To reproduce:
https://godbolt.org/z/P3h89YecG
