Re: Flex doesn't generate pure ANSI C code]

[John W. Millaway]

> >I want to make Flex to generate pure ANSI C code (or K&R) without
> >using any non-standard header files or functions.
> >
> >File lex.yy.c includes 'unistd.h' and uses 'read' function but my
> >compiler doesn't support it and I want to have ANSI C compatible
> >program.

Flex does not do this by default. You must have specifically requested a system
read(), instead of fread(), by using one of the optimization options, -Cr or
'%option read'. Note that the following options all trigger '%option read' to
be enabled:

-Cr or  %option read
-f  or  %option full  (since it is just a shortcut for -Cfr)
-F or  %option fast  (since it is just a shortcut for -CFr)

See the section, "OPTIONS", in the manual.



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