Format Checks Specific to Particular Target Machines#
For some target machines, GCC supports additional options to the format attribute (see Declaring Attributes of Functions).
Solaris Format Checks#
Solaris targets support the cmn_err
(or __cmn_err__
) format
check. cmn_err
accepts a subset of the standard printf
conversions, and the two-argument %b
conversion for displaying
bit-fields. See the Solaris man page for cmn_err
for more information.
Darwin Format Checks#
In addition to the full set of format archetypes (attribute format style
arguments such as printf
, scanf
, strftime
, and
strfmon
), Darwin targets also support the CFString
(or
__CFString__
) archetype in the format
attribute.
Declarations with this archetype are parsed for correct syntax
and argument types. However, parsing of the format string itself and
validating arguments against it in calls to such functions is currently
not performed.
Additionally, CFStringRefs
(defined by the CoreFoundation
headers) may
also be used as format arguments. Note that the relevant headers are only likely to be
available on Darwin (OSX) installations. On such installations, the XCode and system
documentation provide descriptions of CFString
, CFStringRefs
and
associated functions.