configure.info: Multilibs

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Multilibs

   For some targets gcc may have different processor requirements
depending upon command line options.  An obvious example is the
`-msoft-float' option supported on several processors.  This option
means that the floating point registers are not available, which means
that floating point operations must be done by calling an emulation
subroutine rather than by using machine instructions.
   For such options, gcc is often configured to compile target libraries
twice: once with `-msoft-float' and once without.  When gcc compiles
target libraries more than once, the resulting libraries are called
"multilibs".
   Multilibs are not really part of the GNU configure and build system,
but we discuss them here since they require support in the `configure'
scripts and `Makefile's used for target libraries.