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@node Compliance to Standards
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@appendix GNUstep Compliance to Standards
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@cindex standards, GNUstep compliance to
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@cindex standards compliance
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@cindex OpenStep compliance
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@cindex OS X compatibility
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GNUstep is generally compatible with the OpenStep specification and with
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recent developments of the MacOS-X (Cocoa) API. Where MacOS deviates from the
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OpenStep API, GNUstep generally attempts to support both versions. In some
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cases the newer MacOS APIs are incompatible with OpenStep, and GNUstep usually
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supports the richer version.
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In order to deal with compatiblity issues, GNUstep uses two mechanisms - it
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provides conditionally compiled sections of the library header files, so that
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software can be built that will conform strictly to a particular API, and it
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provides user default settings to control the behavior of the library at
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@section Conditional Compilation
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@cindex compilation, conditional
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Adding an option to a makefile to define one of the following preprocessor
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constants will modify the API visible to software being compiled -
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GNUstep specific extensions to the OpenStep and MacOS cocoa APIs are
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excluded from the headers.
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@deffn {} STRICT_MACOS_X
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Only methods and classes that are part of the MacOS cocoa API are made
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available in the headers.
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@deffn {} STRICT_OPENSTEP
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Only methods and classes that are part of the OpenStep specification are
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made available in the headers.
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Note, these preprocessor constants are used in developer code (ie the code
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that users of GNUstep write) rather than by the GNUstep software itself. They
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permit a developer to ensure that he/she does not write code which depends
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upon API not present on other implementations (in practice, MacOS-X or some
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old OPENSTEP systems). The actual GNUstep libraries are always built with the
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full GNUstep API in place, so that the feature set is as consistent as
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@section User Defaults
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@cindex user defaults, API compliance
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User defaults may be specified ///
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An array of strings that lists debug levels to be used within the
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program. These debug levels are merged with any which were set on the command
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line or added programmatically to the set given by the
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[NSProcessInfo-debugSet] method.
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Setting the user default GSLogSyslog to YES will cause log/debug output to be
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sent to the syslog facility (on systems which support it), rather than to the
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standard error stream. This is useful in environments where stderr has been
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re-used strangely for some reason.
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@deffn {} GSMacOSXCompatible
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Setting the user default GSMacOSXCompatible to YES will cause MacOS compatible
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behavior to be the default at runtime. This default may however be overridden
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to provide more fine grained control of system behavior.
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@deffn {} GSOldStyleGeometry
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Specifies whether the functions for producing strings describing geometric
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structures (NSStringFromPoint(), NSStringFromSize(), and NSStringFromRect())
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should produce strings conforming to the OpenStep specification or to MacOS-X
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behavior. The functions for parsing those strings should cope with both cases
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May be used to specify a default SOCKS5 server (and optionally a port
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separated from the server by a colon) to which tcp/ip connections made using
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the NSFileHandle extension methods should be directed.
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This default overrides the SOCKS5_SERVER and SOCKS_SERVER environment variables.
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@deffn {} {Local Time Zone}
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Used to specify the name of the timezone to be used by the NSTimeZone class.
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@deffn {} NSWriteOldStylePropertyLists
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Specifies whether text property-list output should be in the default MacOS-X
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format (XML), or in the more human readable (but less powerful) original
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Reading of property lists is supported in either format, but only if GNUstep
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is built with the libxml library (which is needed to handle XML parsing).
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NB. MacOS-X generates illegal XML for some strings - those which contain
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characters not legal in XML. GNUstep always generates legal XML, at the cost
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of a certain degree of compatibility. GNUstep XML property lists use a
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backslash to escape illegal chatracters, and consequently any string
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containing either a backslash or an illegal character will be written
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differently to the same string on MacOS-X.
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@deffn {} NSLanguages
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An array of strings that lists the users prefered languages, in order or
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preference. If not found the default is just English.
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Documentation/manual/Compliance.texi
