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Some small info on compatibility added

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richard 2000-09-08 18:41:41 +00:00
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Documentation/gsdoc/Base.gsdoc
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@ -14,9 +14,73 @@
<chapter>
<heading>Base</heading>
<p>
The GNUstep base library is a free software package compatible with
the OpenStep Foundation Kit (tm).
The GNUstep base library is a free software package implementing
the API of the OpenStep Foundation Kit (tm), including later
additions.
</p>
<section>
<heading>Compatibility</heading>
<p>
GNUstep is generally compatible with the OpenStep specification and
with recent developments of the MacOS (cocoa) API. Where MacOS
deviates from the OpenStep API, GNUstep generally attempts to
support both versions. In some cases the newer MacOS APIs are
incompatible with OpenStep, and GNUstep usually supports the richer
version.
</p>
<p>
In order to deal with compatiblity issues, GNUstep uses two
mechanisms - it provides conditionally compiled sections of
the library header files, so that software can be built that
will conform strictly to a particular API, and it provides
user default settings to control the behavior of the library
at runtime.
</p>
<subsect>
<heading>Conditional compilation</heading>
<p>
Adding an option to a makefile to define one of the following
preprocessor constants will modify the API visible to software
being compiled -
</p>
<deflist>
<term>NO_GNUSTEP</term>
<desc>
GNUstep specific extensions to the OpenStep and MacOS cocoa
APIs are excluded from the headers.
</desc>
<term>STRICT_MACOS_X</term>
<desc>
Only methods and classes that are part of the MacOS cocoa
API are made available in the headers.
</desc>
<term>STRICT_OPENSTEP</term>
<desc>
Only methods and classes that are part of the OpenStep
specification are made available in the headers.
</desc>
</deflist>
</subsect>
<subsect>
<heading>User defaults</heading>
<p>
Setting the user default <code>GSMacOSXCompatible</code> to
<code>YES</code> will cause MacOS compatible behavior to be
the default at runtime. This default may however be overridden
to provide more fine grained control of system behavior.
</p>
<deflist>
<term>GSMacOSXCompatibleGeometry</term>
<desc>
Specifies whether the functions for producing strings describing
geometrical structures (NSStringFromPoint(), NSStringFromSize(),
and NSStringFromRect()) should produce strings conforming to the
OpenStep specification or to MacOS-X behavior. The functions
for parsing those strings should cope with both cases anyway.
</desc>
</deflist>
</subsect>
</section>
<section>
<heading>The classes</heading>
<list>