worked!  http://paste.ubuntu.com/23893379/
-su-4.4# nm -D /usr/lib/libstdc++.so.6 |grep __locale_struct |wc -l
0
anything i missed? it it acceptable ? and how could i post this to the
upstream?

2017-01-30 0:49 GMT+08:00 Rich Felker <dalias@libc.org>:

> On Sun, Jan 29, 2017 at 05:40:08PM +0100, Szabolcs Nagy wrote:
> > * He X <xw897002528@gmail.com> [2017-01-29 22:48:34 +0800]:
> > > 2. no other ways, musl will use generic config 100%, and then the
> > > exception, the run time error is hardcoded there; but i doubt if this
> > > really breaks binaries, the function is only called by libstdc++
> itself.
> > > you cant only update the config, but does not update libstdc++.
> libstdc++
> > > exported the same abi for common binaries, wont break most
> dynamic-loaded
> > > binary in my view.
> >
> > that's not how abi works.. you change the __c_locale typedef
> > of the generic config from int* to locale_t, such change
> > breaks abi and cannot be upstreamed to gcc. (it's unfortunate
> > that the c++ locale handling default for non-gnu systems
> > does not use posix locales correctly, but breaking abi
> > for all non-gnu systems is not an acceptable fix.)
> >
> > with your change the abi of libstdc++ would look like
> > the current gnu abi:
> >
> > $ grep __locale_struct libstdc++-v3/config/abi/post/
> x86_64-linux-gnu/baseline_symbols.txt |wc -l
> > 72
> >
> > the abi on a musl based system is like
> >
> > $ nm -D /usr/lib/libstdc++.so.6 |grep __locale_struct |wc -l
> > 0
> >
> > so with your patch if a compiled binary refers to any one
> > of those 72 symbols then the dynamic linker will fail to
> > load it on a musl based system.
>
> So would this work?
>
> struct __generic_locale {
>         int dummy;
>         localt_t locale;
> };
>
> Then allocate these objects with new. That way int* could point to the
> object (by pointing to its first member) and the locale_t could be
> obtained. Wasteful and ugly, but valid.
>
> Any other fix seems to assume int* can represent locale_t; I don't
> think that's valid for a "generic" implementation.
>
> Rich
>