[Bug ld/26018] Make --dynamic-list* override -Bsymbolic and -Bsymbolic-functions

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26018

--- Comment #3 from Fangrui Song <i at maskray dot me> ---
I don't agree with the resolution. Copying my reply
https://sourceware.org/pipermail/binutils/2020-May/111223.html here

IIRC, currently -Bsymbolic --dynamic-list a.list != --dynamic-list a.list
 -Bsymbolic

This order dependency is error-prone. It is still fixable because I don't think
any project makes uses of the combination. Order dependency also makes it
unclear how --dynamic-list associates with other symbol exporting options.


--dynamic-list* work for both executables and shared libraries.
For an executable, export some symbols.
For a shared library, specify preemptible symbols.


--dynamic-list* have function overlay
with -Bsymbolic. When two options overlap in functionality, many users
expect the more fine-grained option to win, thus it is preferable for 
--dynamic-list* to override -Bsymbolic and -Bsymbolic-functions.

We could also emit a warning and say -Bsymbolic is ignored, if that matters.

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