GCJ/C++ name mangling incompatibility w/ "$"

Mon Mar 12 16:23:00 GMT 2001

Bryce McKinlay wrote:
> The problem is that gcc/java/mangle_name.c is seeing
> NO_DOLLAR_IN_LABEL as defined. I think this comes from
> gcc/config/elfos.h. This is with the 3.0 branch on i686-pc-linux-gnu.
>> The C++ name mangler is not honoring this definition, and is using "$"
> characters anyway. That doesn't seem to be a problem in itself, but it
> does break ABI compatibility between C++ and Java.
>> So, who is right? Does C++ need to be fixed to use __U24_ instead of
> "$" in mangled names like GCJ does when NO_DOLLAR_IN_LABEL is defined, or
> does GCJ need to ignore NO_DOLLAR_IN_LABEL like C++ apparantly does?

It seems to me that it's a bug if we ever generate a '$' in a label if
NO_DOLLAR_IN_LABEL is defined, since on some platforms where it is defined
the assembler will barf if it sees a '$' (even though this is not true
on i686-pc-linux-gnu).
But this strikes me as odd, because I know that in at least some places
the C++ name mangling checks NO_DOLLAR_IN_LABEL (e.g. for virtual
function table symbols).