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Multilibs in gcc

   In gcc, multilibs are defined by setting the variable
`MULTILIB_OPTIONS' in the target `Makefile' fragment.  Several other
`MULTILIB' variables may also be defined there.  *Note The Target
Makefile Fragment: (gcc)Target Fragment.
   If you have built gcc, you can see what multilibs it uses by running
it with the `-print-multi-lib' option.  The output `.;' means that no
multilibs are used.  In general, the output is a sequence of lines, one
per multilib.  The first part of each line, up to the `;', is the name
of the multilib directory.  The second part is a list of compiler
options separated by `@' characters.
   Multilibs are built in a tree of directories.  The top of the tree,
represented by `.' in the list of multilib directories, is the default
library to use when no special compiler options are used.  The
subdirectories of the tree hold versions of the library to use when
particular compiler options are used.