[lldb-dev] Anonymous Namespace - Bug 15302

[Reid Kleckner]

On Mon, Jul 28, 2014 at 5:08 PM, Greg Clayton <gclayton at apple.com> wrote:

>
> > On Jul 28, 2014, at 2:26 PM, Alex Pepper <apepper at blueshiftinc.com>
> wrote:
> >
> > I investigated bug 15302, which is described as:
> >
> > "LLDB does not print 'anonymous namespace' prefix for variable names (if
> inferior built with GCC on Linux)"
> >
> > What I found was that the GCC dwarf data does not contain a mangled name
> for a variable defined in an anonymous namespace, unlike clang.  LLDB
> VariableObject depends on the mangled name to identify the anonymous
> namespace for a variable, so in the test case it does no print the
> (anonymous namespace) prefix.  I checked the dwarf data using dwarfdump and
> nm.  In the case of dwarfdump the variable is a child of the anonymous
> namespace but there is no mangled name, but when I use nm to dump the
> symbols it displays the mangled name.  I am not sure if this means nm is
> generating the name or getting the symbol from somewhere else.
>
> nm only looks at the symbol table and the symbol table will contain only
> the mangled name for the variable.


Yeah, I would try to solve this by looking at .symtab, which is where nm
gets the mangled name.  I doubt gcc will start emitting linkage names into
dwarf soon enough to be useful.  The dwarf linkage name might also be
missing due to -gline-tables-only / -gmlt type flags.
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