gcc and precompiled headers

[Greg Troxel <gdt%lexort.com@localhost>]

I'm updating qgis in pkgsrc, and now it uses precompiled headers.  While
I want to just disable that, that's not the point of this message.

On NetBSD 10 I see messages:

  [110/5655] Building CXX object src/core/CMakeFiles/qgis_core.dir/symbology/qgssymbollayerreference.cpp.o
  cc1plus: warning: /tmp/work/geography/qgis/work/qgis-3.44.4/cmake-pkgsrc-build/src/core/CMakeFiles/qgis_core.dir/cmake_pch.hxx.gch: had text segment at different address

and the Internet says that gcc's precompiled header support is buggy and
can't deal with ASLR.

  - Is this a known issue on NetBSD?
  - Specific to some but not all gcc versions?
  - Any other clues?