Bug #17648: `__builtin_longjmp` must not be called from the same function calling `__builtin_setjmp`

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 3.1.0dev (2021-02-19 master a319c04818) [armv7a-linux-eabi]
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[xtkoba (Tee KOBAYASHI)]

According to the GCC manual [1], it is forbidden that __builtin_setjmp and __builtin_longjmp with the same context be called from the same function. In the current code, however, it can happen due to compiler optimizations.

The attached patch presents a workaround, which wraps __builtin_longjmp with a noinline function.

[1] https://gcc.gnu.org/onlinedocs/gcc/Nonlocal-Gotos.html

[xtkoba (Tee KOBAYASHI)]

This workaround seems not necessary. Compilers seem very much aware of this situation. So please reject it. Sorry for the confusion.

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Rejected