Re: yacc.c: Extracting yysyntax_error

[Paul Eggert]

Hans Aberg <address@hidden> writes:

> The C++ standard, 18.7:5, says:

I'm afraid that doesn't resolve the issue well enough for Bison.  A
portable ISO C signal handler can't do much of anything -- all it can
do is set a global variable.  Most real-world signal handlers in
Bison-using programs do more than that (e.g., longjmp, remove files,
etc.) but they are relying on POSIX guarantees not merely ISO C
guarantees.

POSIX allows portable signal handlers to do much of the stuff that
real-world signal handlers need to do, but POSIX does not specify how
C++ programs behave, and C++ does not specify how POSIX signal
handling works.  So there's no standard for how C++ exception handling
interacts with POSIX signals, and in practice I suspect it tends to be
a wild and woolly area.