(configure.info) Multilibs

 
 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.
(configure.info) Multilibs

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