c++/4966: [3.2/3.3/3.4 regression] g++ generates incorrect debugging information

[Christian Ehrhardt]

It seems that g++ emits two identical copies of the constructor
for B from the same source lines. When gdb sets the breakpoint
at the specified line it chooses one of those copies but gcc happens
to call the other copy. Thus the breakpoint is never reached.
This means that this is probably a gdb bug (gdb should set two break
points) but someone should verify that the debugging information
is really ok.

    regards  Christian

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