cvs commit: src/share/man/man9 style.9

[M. Warner Losh]

In message: <20080709154945.GA47824 at zim.MIT.EDU>
            David Schultz <das at FreeBSD.org> writes:
: On Wed, Jul 09, 2008, Daniel Gerzo wrote:
: > -Do not declare functions inside other functions; ANSI C says that
: > -such declarations have file scope regardless of the nesting of the
: > -declaration.
: > -Hiding file declarations in what appears to be a local
: > -scope is undesirable and will elicit complaints from a good compiler.
: > +Do not declare functions inside other functions; nested functions are
: > +a GCC extension and are not permitted by ANSI C.
: 
: We use lots of extensions that aren't strict ANSI C. I think the
: real reason not to use them is that gcc's nested functions are
: particularly unwieldily. First, they're not true lexical closures
: (and can't be), which makes them much less useful. Second, they
: are unsupported unless a number of assumptions are met, e.g., must
: have an executable stack, must be able to invalidate the I cache
: from userland, and must not have separate I and D address spaces.
: Nested functions abominable enough that Apple disabled the feature
: in OS X's build of gcc --- and the Sun and Intel compilers don't
: support them, even though Intel claims nearly complete gcc
: compatibility.

I think the bug in the commit was the '-' lines.  The '+' lines were
good.  Maybe a .Pp line would then be needed.

Warner