[Bug c++/121924] New: exit destruction occurs with GCC for constructor that did not complete

[hstong at ca dot ibm.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121924

            Bug ID: 121924
           Summary: exit destruction occurs with GCC for constructor that
                    did not complete
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hstong at ca dot ibm.com
  Target Milestone: ---

GCC generates code that calls the destructor for an object whose constructor
did not complete.

https://godbolt.org/z/9hPo6ahe8

### SOURCE (<stdin>):
extern "C" int printf(const char *, ...);
extern "C" void exit(int);
struct Temp {
  ~Temp() {
    printf("%s: %p\n", __PRETTY_FUNCTION__, (void *)this);
  }
  Temp() {
    static int cnt = 0;
    if (++cnt == 2) exit(0);
    printf("%s: %p\n", __PRETTY_FUNCTION__, (void *)this);
  }
  Temp(const Temp &) = delete;
};

struct A { const Temp &t; };
A a[] = {Temp(), Temp()};
int main() { }


### COMPILER INVOCATION:
g++ -o a.out -xc++ -


### PROGRAM INVOCATION:
./a.out


### ACTUAL OUTPUT:
Temp::Temp(): 0x404040
Temp::~Temp(): 0x404041
Temp::~Temp(): 0x404040


### EXPECTED OUTPUT:
Temp::Temp(): 0x404040
Temp::~Temp(): 0x404040


### COMPILER VERSION INFO (g++ -v):
Using built-in specs.
COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++
COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head
--enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl
--enable-checking=release --disable-nls --enable-lto
LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250911 (experimental) (GCC)