[Bug ld/30768] X86: copy relocation against non-copyable protected symbol

[xiezhiheng at huawei dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30768

--- Comment #2 from xiezhiheng <xiezhiheng at huawei dot com> ---
(In reply to H.J. Lu from comment #1)
> I have
> 
> have-protected-data = no
> 
> in config.make.  What do you have?

In my config.make, have-protected-data = yes

Oh I think I find something interesting. Thanks a lot for the hint.

Normally for checking linker support for protected data symbol, it gets
failure.

configure:6698: checking linker support for protected data symbol
configure:6709: gcc -nostdlib -nostartfiles -fno-stack-protector -fPIC -shared
conftest.c -o conftest.so
configure:6712: $? = 0
configure:6719: gcc -nostdlib -nostartfiles -fno-stack-protector conftest.c -o
conftest conftest.so
/usr/bin/ld: error: /tmp/ccU1Z7bY.o: cannot make copy relocation for protected
symbol 'bar', defined in conftest.so
collect2: error: ld returned 1 exit status
configure:6722: $? = 1
configure:6730: result: no

But in my building system, for safety reasons, we add -fPIC option globally in
some way. So it would be like
  gcc -nostdlib -nostartfiles -fno-stack-protector -fPIC -shared conftest.c -o
conftest.so
  gcc -nostdlib -nostartfiles -fno-stack-protector conftest.c -o conftest
conftest.so -fPIC
and it passes.

I think it may be the key point for the failure.

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