[Octave-patch-tracker] [patch #8919] Start of patch to enable visibility attributes for GCC in build system

[Rik]

Follow-up Comment #29, patch #8919 (project octave):

I'm getting an error during final linking that is probably related to the
visibility changes.  The error is


libinterp/.libs/liboctinterp.so: undefined reference to
`Array<idx_vector>::operator()(long) const'


This happens when I use compilation flags "-O0 -pipe".  It disappears if I use
an optimization level of 1 or 2.  Perhaps this is a g++ bug as well.  My
version is "g++ (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0".

It's annoying because the flags that I typically run for debugging are "-ggdb3
-O0 -pipe" because I find that the optimization makes it harder to walk
through code in gdb.

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