https://www.intel.com/content/www/us/en/docs/dpcpp-cpp-compiler/developer-guide-reference/2025-0/fvisibility.html
fvisibility
Specifies the default visibility for global symbols or the visibility for symbols in declarations, functions, or variables.
https://bugs.php.net/bug.php?id=73062&edit=2
PHP :: Bug #73062 :: Test for -fvisibility=hidden support fails with certain $CC
https://gcc.gnu.org/pipermail/gcc-help/2015-June/122600.html
-fvisibility=hidden vs. typeinfo
hiddenvs
https://mail.kde.org/pipermail/kde-core-devel/2004-November/022170.html
[PATCH] -fvisibility problems
patchproblems
https://www.intel.com/content/www/us/en/docs/fortran-compiler/developer-guide-reference/2025-2/fvisibility.html
fvisibility
Specifies the default visibility for global symbols or the visibility for symbols in a file.