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I can't reproduce on other machines. But on 1 of computers dbx is default debugger for GCC.
Created attachment 85397 [details] screenshot
Created attachment 85398 [details] screenshot
there is no gmake or make of gdb in /usr/local/bin, so we try to find make and debugger tools in other installed toolchains (Sun Studio), that's why we end up with dbx and dmake.
for gnu we now need to set that we accept only gnu debuggers (family GNU), but that does not work because we do not check current toolchain in autoComplete toolchain...
but choosing dbx is incorrect. The debugger front-end (GdbLite) knows only how to deal with gdb and not (yet) with dbx. Choosing dbx doesn't yet make any sense. Dbx should be removed from toolchain until there is truly support for it.
There is no debugging now with SunStudio toolchain. The debugger simply doesn't start. This is a major regression and should be fixed asap, hence the p1 priority.
fixed in: http://hg.netbeans.org/cnd-main/rev/075ac1dabde4
verified in 6.8M1
move dbx related issues into dbx-gui component