| Issue |
202828
|
| Summary |
[libc++] `std::exit` does not call `terminate` when `atexit` handler exits via an exception
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
hubert-reinterpretcast
|
Since at least C++98, `std::exit` has been specified such that `std::terminate` is called when an `atexit`-registered function exits via an exception (C++98 subclause 18.3 [lib.support.start.term] paragraph 5, https://wg21.link/support.start.term#9.1). libc++ does not meet this requirement as it allows both the search for a handler and stack unwinding itself to continue past the body of `std::exit`.
https://godbolt.org/z/18cPzKnTo
### Source (`<stdin>`)
```cpp
#include <stdlib.h>
void cleanup() { throw 42; }
void f [[gnu::weak]]() { exit(EXIT_FAILURE); }
volatile auto fn = cleanup;
int main(void) {
atexit(fn);
try {
f();
} catch (...) { return 0; }
}
```
### Compiler invocation
```
clang++ -std=c++26 --stdlib=libc++ -xc++ - -o prog
```
### Program invocation
```
./prog
```
### Actual program output
(rc=0)
### Expected program output
```
libc++abi: terminating due to uncaught exception of type int
```
### Compiler version info (clang++ -v)
```
clang version 23.0.0git (https://github.com/llvm/llvm-project.git e34dc2960ce94be069ac2a973c943b61ef9b3b23)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/14
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/14
Candidate multilib: .;@m64
Selected multilib: .;@m64
```
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