egcs and exceptions

[Alexandre Oliva]

Andris Pavenis <pavenis@lanet.lv> writes:

> with -fsjlj-exceptions : I was not able to get exceptions working
> 	for both Linux and DJGPP and with stable release (egcs-1.1)

> 	So it's seems that -fsjlj-exceptions is broken with egcs-1.1
> 	and later snapshots

Maybe you have to build libgcc.a and libstdc++.a with this option
enabled.  At least that's my reading from gcc/except.c:

   There are two major codegen options for exception handling.  The
   flag -fsjlj-exceptions can be used to select the setjmp/longjmp
   approach, which is the default.  -fno-sjlj-exceptions can be used to
   get the PC range table approach.  While this is a compile time
   flag, an entire application must be compiled with the same codegen
   option.  

Of course one may argue that libgcc has nothing to do with `the entire 
application', and I'm not really sure you must really choose sjlj at
build time, but if you have spare CPU cycles to try that, it would be
nice to know...

-- 
Alexandre Oliva
mailto:oliva@dcc.unicamp.br mailto:oliva@gnu.org mailto:aoliva@acm.org
http://www.dcc.unicamp.br/~oliva
Universidade Estadual de Campinas, SP, Brasil