[Tinycc-devel] Fix for -gdwarf

[Detlef Riekenberg]

tcc -gdwarf did not work as expected.

When tcc was compiled without DWARF as default (--dwarf=5 as example),
then DWARF_VERSION is 0, the -gdwarf command line option did not changed 
s->dwarf
and tcc created stabs debug infos.

I pushed a fix.
Now, tcc does the same as gcc with "-gdwarf":
dwarf-2 on Darwin/Mac OS X and dwarf-5 on other systems

--
Bye bye ... Detlef