[PATCH 09/58] Mark internal wchar functions with attribute_hidden [BZ #18822]

[Stefan Liebler]

On 09/01/2017 07:59 PM, H.J. Lu wrote:
> Mark internal wchar functions with attribute_hidden to allow direct
> access within libc.so and libc.a without using GOT nor PLT.

On s390 (31bit) various debug/tst-*chk* testcases are failing as the 
tests are ending with a segmentation fault.
As some of the wchar functions are IFUNC, those are called via PLT,
but r12 is not loaded with the GOT-pointer. Then it e.g. branches to 
address zero which leads to the segmentation fault.

Please have a look at the patch "Use libc_hidden_proto / _def for hidden 
wchar ifunc symbols." 
(https://www.sourceware.org/ml/libc-alpha/2017-11/msg00391.html).

Bye.
Stefan