[Bug c++/34152] Erratic behaviour: Exception translation (throw from signal handlers)

["asteinarson at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from asteinarson at gmail dot com  2007-11-19 16:21 -------
I found something out. If I add a further function call to FuncNested1:

int FuncNested2(  ){
    StructWithDtor swd;
    return 0;
} 

int FuncNested1( int *pi ){
    StructWithDtor swd;
    FuncNested2( );   // This trigger unwind table generation
    return *pi;
}

then it works. It seems that FuncNested1 in the first form: 

int FuncNested1( int *pi ){
    StructWithDtor swd;
    return *pi;
}

never generates any unwinding information (since it doesn't call other
functions) and when SIGSEGV happens inside it, it cannot find any unwind tables
and C++ run-time bails out. I can understand the logic behind this, but it
certainly made my first test case fail miserably.

In a realworld app, the optimization is probably OK, since a function
generating the signal is likely to contain other function calls (not bullet
proof).

It is possible to interpret -asynchronous-unwind-tables to support this but
that option changes nothing for my test case.

An option -always-generate-unwind-tables would be useful in this case (but
probably results in a larger executable).

Regards
// ATS.


-- 

asteinarson at gmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |asteinarson at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34152