[Bug libstdc++/105417] [11/12 Regression] powerpc64le-linux abilist changes based on --with-long-double-format=

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105417

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
>From what I can see, the --with-long-double-format=ibm libstdc++.a has
following _M_extract_int symbols (for simplicity only listing Ij symbols,
I[lmtxy] are present/absent next to it:
compatibility-ldbl-alt128.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ieee1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
0000000000000000 W
_ZNKSt17__gnu_cxx_ieee1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
cxx11-locale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ldbl1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intB5cxx11IjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
cxx11-wlocale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ldbl1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intB5cxx11IjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
locale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ldbl1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
0000000000000000 W
_ZNKSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intIjEES3_S3_S3_RSt8ios_baseRSt12_Ios_IostateRT_
wlocale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ldbl1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
0000000000000000 W
_ZNKSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intIjEES3_S3_S3_RSt8ios_baseRSt12_Ios_IostateRT_

while --with-long-double-format=ieee libstdc++.a has:
compatibility-ldbl-alt128.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ldbl1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
0000000000000000 W
_ZNKSt17__gnu_cxx_ldbl1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
0000000000000000 W
_ZNKSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intIjEES3_S3_S3_RSt8ios_baseRSt12_Ios_IostateRT_
0000000000000000 W
_ZNKSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intIjEES3_S3_S3_RSt8ios_baseRSt12_Ios_IostateRT_
cxx11-locale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ieee1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intB5cxx11IjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
cxx11-wlocale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ieee1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intB5cxx11IjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
locale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ieee1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
wlocale-inst.o:
0000000000000000 W
_ZNKSt17__gnu_cxx_ieee1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intIjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_

Now, the symbols in compatibility-ldbl-alt128.o and {,w}locale-inst.o match
between the 2 builds, basically for each narrow and wide we export all of
std::num_get, std::__gnu_cxx_ldbl128::num_get and
std::__gnu_cxx_ieee128::num_get symbols.
But the cxx11 ABI symbols are not.
On x86_64, I see we have
_ZNKSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intB5cxx11IjEES3_S3_S3_RSt8ios_baseRSt12_Ios_IostateRT_
in cxx11-locale-inst.o and
_ZNKSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intB5cxx11IjEES3_S3_S3_RSt8ios_baseRSt12_Ios_IostateRT_
in cxx11-wlocale-inst.o, but we don't export those, similarly we don't export
those
_ZNKSt17__gnu_cxx_ldbl1287num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE14_M_extract_intB5cxx11IjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
and
_ZNKSt17__gnu_cxx_ldbl1287num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE14_M_extract_intB5cxx11IjEES4_S4_S4_RSt8ios_baseRSt12_Ios_IostateRT_
on targets which switched long double from double to something wider in the
past (including powerpc64*), but we do export the __gnu_cxx_ieee128 ones, which
is
why we get those extra symbols on --with-long-double-format=ieee builds.
Are those cxx11 symbols never needed and so it was a mistake that they've been
exported?
Or is it an omission that they are not exported?