[Bug c++/12291] regression in anonymous namespace variable name mangling

["bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12291


bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-09-15 23:37:02
               date|                            |


------- Additional Comments From bangerth at dealii dot org  2003-09-15 23:37 -------
A very odd failure, indeed. Consider the following code:
--------------------------
struct S {
    int foo() const;
};

void bar(const S& s) { s.foo(); }

struct X {
    int foo () const { return S().foo(); }
};

namespace { int option_array; }
--------------------------

Compiled with present mainline, I get the following result:
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ -c y.cc
g/x> nm y.o | grep option_array
00000000 B _ZN21_GLOBAL__N__Z3barRK1S12option_arrayE

There's indeed no trace of the filename in the mangled name. Now, comment
out the unrelated function bar():
-------------------------
struct S {
    int foo() const;
};

//void bar(const S& s) { s.foo(); }

struct X {
    int foo () const { return S().foo(); }
};

namespace { int option_array; }
---------------------------

g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ -c y.cc
g/x> nm y.o | grep option_array
00000000 B _ZN33_GLOBAL__N_y.cc_FCBB6B6F_09E9D69B12option_arrayE

Ups -- the filename is back. What's going on here?

I can see this behavior going all the way back to gcc2.95, so this
is not a recent regression.

W.