svr4
            This option changes the meaning of some other options on the command line and the standard behavior of the linker. It has the following
            effect on the linker:
              *    -b rtl is set
              *    -b rtllib is set only when building an executable or if not set explicitly to -b nortllib
              *    -b symbolic is set only when building an executable or if not set explicitly by one of -b symbolic, -b nosymbolic, or -b
                   nosymbolic-
              *    -b expfull is set only when neither -b E nor -b export are present
              *    -b noexpall is set
              *    -d, instead of being ignored, is redefined and can assume two values: -dy or -dn
              *    -R, instead of being ignored, takes one suboption that defines the runtime library search path
              *    -z, instead of being a synonym of the -K option, takes either defs, nodefs, multidefs, text, nowarntext, or warntext, as a
                   suboption
              *    directories specified with the -L option are not included in the runtime libraries search path