> Thanks for the tip!  Perhaps we should add a sentence about it in the
> documentation?

-B is already documented in "Options for Directory Search":

`-BPREFIX'
     This option specifies where to find the executables, libraries,
     include files, and data files of the compiler itself.

     The compiler driver program runs one or more of the subprograms
     `cpp', `cc1', `as' and `ld'.  It tries PREFIX as a prefix for each
     program it tries to run, both with and without `MACHINE/VERSION/'
     (*note Target Options::).

-- 
Eric Botcazou

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