-Bprefix

[ali hagigat]

3.14 Options for Directory Search
-Bprefix
variable.
The compiler will check to see if the path provided by the ‘-B’ refers to a
directory, and if necessary it will add a directory separator
character at the end
of the path.
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I have copied part of gcc manual. What it is trying to say? Can path
provided by -B not a directory?
What does it mean?