Runtime / exceptions model configuration options

[Riccardo Mottola]

Hi All,

I am a bit confused about how to configure different exceptions and 
runtimes in gnustep make and gui!

I notice we have no clear section in a README or INSTALL file or on the 
wiki, or, in case, I missed it.

I need to control of it to correctly test libobjc2 by David and also to 
avoid this error:

"There are two separate       exception handling mechanisms available 
... one based on the standard setjmp() function (which does not require 
special compiler support), and one 'native' version where the compiler 
manages the exception handling. If you try to use both in the same 
executable, exception handlers will not work... which can be pretty 
disastrous. This error is telling you that the gnustep-base library was 
built using one form of exception handling, but that the gnustep-make 
package you are using is building code to use the other form of 
exception handling ... with the consequence that exception handling 
would be broken in the program you are building. So, somehow your 
gnustep-base and gnustep-make package are incompatible, and you need to 
replace one of them with a version configured to match the other."

So we have standard and native.

I understand that standard is default for gcc. Fine.

The issue is when wanting to use libobjc2 and/or clang.

gnustep-make if used with clang enables native exceptions (most probably 
becausde it is clang's default)

I think that if I use --with-library-combo=ng-gnu-gnu on gnustep-base I 
enable automatically also native exceptions

How can I build e.g. with clang and standard exceptions? do I need to 
pass specific CFLAGS perhaps or do we have ebtter options? I didn't find 
any.

For example, would like to compile code with clang but standard 
exceptions, so that I can rule out gcc issues with libobjc2.

Thank you,
Riccardo