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manpage: document and explain __FUNC__ and __NULL__

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Wolfgang Bumiller 2013-04-24 17:42:48 +02:00
parent 66305c676a
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doc/gmqcc.1
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@ -351,15 +351,28 @@ __RANDOM__
__RANDOM_LAST__ __RANDOM_LAST__
__DATE__ __DATE__
__TIME__ __TIME__
__FUNC__
.Ed .Ed
.Pp .Pp
Note that
.Li __FUNC__
is not actually a preprocessor macro, but is recognized by the parser
even with the preprocessor disabled.
.Pp
Note that fteqcc also defines Note that fteqcc also defines
.Li __NULL__ .Li __NULL__
which is not implemented yet. which becomes the first global. Assigning it to a vector does not
yield the same result as in gmqcc where
.Li __NULL__
is defined to
.Li nil
(See (See
.Fl f Ns Cm untyped-nil .Fl f Ns Cm untyped-nil
about gmqcc's alternative to ), which will cause the vector to be zero in all components. With fteqcc
.Li __NULL__ Ns ). only the first component will be 0, while the other two will become
the first to of the global return value. This behavior is odd and
relying on it should be discouraged, and thus is not supported by
gmqcc.
.It Fl f Ns Cm relaxed-switch .It Fl f Ns Cm relaxed-switch
Allow switch cases to use non constant variables. Allow switch cases to use non constant variables.
.It Fl f Ns Cm short-logic .It Fl f Ns Cm short-logic