Public bug reported:

In `OpenCASCADEConfig.cmake`, I noticed that the
`OpenCASCADE_LINKER_FLAGS` include `-Bsymbolic-functions` which I
believe is an outdated option with some potential downsides [1].

For comparison, the Debian version of this package uses the following line to 
set `OpenCASCADE_LINKER_FLAGS`:
```
set (OpenCASCADE_LINKER_FLAGS   "-lm -Wl,-z,relro -Wl,-z,now")
```

Is it strictly necessary to have the `-Bsymbolic-functions` option?

Thanks!


1: https://stackoverflow.com/questions/7216973/is-there-a-downside-to-
using-bsymbolic-functions

** Affects: opencascade (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2117207

Title:
  Linker flags: -Bsymbolic-functions

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