[Tinycc-devel] avoid exit(1) when tcc_get_symbol() failes in libtcc.a

[Joerg Raedler]

Dear Fabrice, dear tcc users,

I'm working on a Python (1)  module which uses libtcc. The module let the user 
call and control the tcc from Python. One goal (works at least partially now) 
is to compile, link and call functions from the python interpreter at 
runtime.

One problem appears when a symbol lookup failes with tcc_get_symbol(). The 
function error() calls exit(1) after sending the error string to my own error 
handler, which is not a good idea for a function contained in an external 
library.
Now I use a workaround (with longjmp() in my error handler) to keep my program 
running on lookup failures.

My idea is to get a NULL pointer as a result when tcc_get_symbol() failes. 
This way my program can decide to exit or to keep running. Is this possible 
or would this break a lot of other code?

Another solution would be to use error_set_jmp_enabled and error_jmp_buf, but 
I can't access these variables by using libtcc.h only.

Thanks in advance,

        Joerg Raedler

(1) www.python.org
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