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<a name="Library-Combination"></a>
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<p>
Next: <a href="Overridable-Flags.html#Overridable-Flags" accesskey="n" rel="next">Overridable Flags</a>, Previous: <a href="Platform-Information.html#Platform-Information" accesskey="p" rel="prev">Platform Information</a>, Up: <a href="Common-Variables.html#Common-Variables" accesskey="u" rel="up">Common Variables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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<a name="Library-Combination-1"></a>
<h4 class="subsection">1.7.4 Library Combination</h4>
<dl>
<dt><a name="index-OBJC_005fRUNTIME_005fLIB"></a>Variable: <strong>OBJC_RUNTIME_LIB</strong></dt>
<dd><p><code>OBJC_RUNTIME_LIB</code> is assigned the code that indicates the
Objective-C Runtime library which compiled Objective-C programs will
use; the four possible values are: ‘<samp>ng</samp>’ for the GNUstep Runtime
with latest language features turned on at acompile time, ‘<samp>gnu</samp>’
for the GNU Runtime (or the GNUstep runtime with traditional
language features compiled), ‘<samp>nx</samp>’ for the NeXT Runtime,
and ‘<samp>sun</samp>’ for the Sun Microsystems Runtime.
The Objective-C Runtime library can be changed
to use a library other than the default with the ‘<samp>library_combo</samp>’
make parameter, see <a href="Running-Make.html#Running-Make">Running Make</a> for more details. Read
<a href="#Library-Combination">Library Combination</a> for more information on how the Makefile
Package handles different library combinations. If a makefile must
perform specific operations dependent upon the Objective-C Runtime
library then this variable is the one to check.
</p></dd></dl>
<dl>
<dt><a name="index-RUNTIME_005fDEFINE"></a>Variable: <strong>RUNTIME_DEFINE</strong></dt>
<dd><p><code>RUNTIME_DEFINE</code> is assigned a preprocessor flag that can be
passed to the compiler which defines a macro based upon the
Objective-C Runtime library that compiled Objective-C programs will
use. This macro is useful if the compiled program must execute
different code based upon the Objective-C Runtime being used. See
<a href="GNUmakefile_002epreamble.html#GNUmakefile_002epreamble">GNUmakefile.preamble</a> for an example on how to pass this
preprocessor flag when compiling. The four possible values are:
‘<samp>-DGNUSTEP_RUNTIME=1</samp>’ for the GNUstep ObjectiveC-2 Runtime,
‘<samp>-DGNU_RUNTIME=1</samp>’ for the GNU Runtime, ‘<samp>-DNeXT_RUNTIME=1</samp>’
for the NeXT Runtime, and ‘<samp>-DSun_RUNTIME=1</samp>’ for the Sun
Microsystems Runtime.
</p></dd></dl>
<dl>
<dt><a name="index-FOUNDATION_005fLIB"></a>Variable: <strong>FOUNDATION_LIB</strong></dt>
<dd><p><code>FOUNDATION_LIB</code> is assigned the code that indicates the
Foundation Kit library, as specified by the OpenStep specification,
which compiled Objective-C programs will use; the four possible values
are: ‘<samp>gnu</samp>’ for the GNUstep Base Library, ‘<samp>nx</samp>’ for the NeXT
Foundation Kit Library, ‘<samp>sun</samp>’ for the Sun Microsystems Foundation
Kit Library, and ‘<samp>fd</samp>’ for the libFoundation Library. The
Foundation Kit library can be changed to use a library other than the
default with the ‘<samp>library_combo</samp>’ make parameter, see <a href="Running-Make.html#Running-Make">Running Make</a> for more details. Read <a href="#Library-Combination">Library Combination</a> for more
information on how the Makefile Package handles different library
combinations. If a makefile must perform specific operations
dependent upon the Foundation Kit library then this variable is the
one to check.
</p></dd></dl>
<dl>
<dt><a name="index-FND_005fDEFINE"></a>Variable: <strong>FND_DEFINE</strong></dt>
<dd><p><code>FND_DEFINE</code> is assigned a preprocessor flag that can be passed
to the compiler which defines a macro based upon the Foundation Kit
library, as specified by the OpenStep specification, which compiled
Objective-C programs will use. This macro is useful if the compiled
program must execute different code based upon the Foundation Kit
library being used. See <a href="GNUmakefile_002epreamble.html#GNUmakefile_002epreamble">GNUmakefile.preamble</a> for an example on
how to pass this preprocessor flag when compiling. The four possible
values are: ‘<samp>-DGNUSTEP_BASE_LIBRARY=1</samp>’ for the GNUstep Base
Library, ‘<samp>-DNeXT_Foundation_LIBRARY=1</samp>’ for the NeXT Foundation
Kit Library, ‘<samp>-DSun_Foundation_LIBRARY=1</samp>’ for the Sun
Microsystems Foundation Kit Library, and
‘<samp>-DLIB_FOUNDATION_LIBRARY=1</samp>’ for the libFoundation Library.
</p></dd></dl>
<dl>
<dt><a name="index-GUI_005fLIB"></a>Variable: <strong>GUI_LIB</strong></dt>
<dd><p><code>GUI_LIB</code> is assigned the code that indicates the Application Kit
library, as specified by the OpenStep specification, which compiled
Objective-C programs will use; the two possible values are: ‘<samp>gnu</samp>’
for the GNUstep GUI Library and ‘<samp>nx</samp>’ for the NeXT Application Kit
Library. The Application Kit library can be changed to use a library
other than the default with the ‘<samp>library_combo</samp>’ make parameter,
see <a href="Running-Make.html#Running-Make">Running Make</a> for more details. Read <a href="#Library-Combination">Library Combination</a> for more information on how the Makefile Package handles
different library combinations. If a makefile must perform specific
operations dependent upon the Application Kit library then this
variable is the one to check.
</p></dd></dl>
<dl>
<dt><a name="index-GUI_005fDEFINE"></a>Variable: <strong>GUI_DEFINE</strong></dt>
<dd><p><code>GUI_DEFINE</code> is assigned a preprocessor flag that can be passed
to the compiler which defines a macro based upon the Application Kit
library, as specified by the OpenStep specification, which compiled
Objective-C programs will use. This macro is useful if the compiled
program must execute different code based upon the Application Kit
library being used. See <a href="GNUmakefile_002epreamble.html#GNUmakefile_002epreamble">GNUmakefile.preamble</a> for an example on
how to pass this preprocessor flag when compiling. The two possible
values are: ‘<samp>-DGNUSTEP_GUI_LIBRARY=1</samp>’ for the GNUstep GUI Library
and ‘<samp>-DNeXT_Application_LIBRARY=1</samp>’ for the NeXT Application Kit
Library.
</p></dd></dl>
<dl>
<dt><a name="index-GUI_005fBACKEND_005fLIB"></a>Variable: <strong>GUI_BACKEND_LIB</strong></dt>
<dd><p><code>GUI_BACKEND_LIB</code> is assigned the code that indicates the backend
library which compiled Objective-C programs will use in conjunction
with the GNUstep GUI Library. The three possible values are:
‘<samp>xdps</samp>’ for the GNUstep X/DPS GUI Backend Library, ‘<samp>nsx</samp>’ for
the NSKit GUI Backend Library, and ‘<samp>w32</samp>’ for the MediaBook WIN32
GUI Backend Library. <code>GUI_BACKEND_LIB</code> is only relevant when
<code>GUI_LIB</code> is set to ‘<samp>gnu</samp>’; otherwise, <code>GUI_BACKEND_LIB</code>
will be set to ‘<samp>nil</samp>’ to indicate that there is no backend
library. <code>GUI_BACKEND_LIB</code> can be changed to use a library other
than the default with the ‘<samp>library_combo</samp>’ make parameter, see
<a href="Running-Make.html#Running-Make">Running Make</a> for more details. Read <a href="#Library-Combination">Library Combination</a>
for more information on how the Makefile Package handles different
library combinations. If a makefile must perform specific operations
dependent upon the backend library then this variable is the one to
check.
</p></dd></dl>
<dl>
<dt><a name="index-GUI_005fBACKEND_005fDEFINE"></a>Variable: <strong>GUI_BACKEND_DEFINE</strong></dt>
<dd><p><code>GUI_BACKEND_DEFINE</code> is assigned a preprocessor flag that can be
passed to the compiler which defines a macro based upon the backend
library which compiled Objective-C programs will use in conjunction
with the GNUstep GUI Library. This macro is useful if the compiled
program must execute different code based upon the backend library
being used. See <a href="GNUmakefile_002epreamble.html#GNUmakefile_002epreamble">GNUmakefile.preamble</a> for an example on how to
pass this preprocessor flag when compiling. The three possible values
are: ‘<samp>-DXDPS_BACKEND_LIBRARY=1</samp>’ for the GNUstep X/DPS GUI Backend
Library, ‘<samp>-DNSX_BACKEND_LIBRARY=1</samp>’ for the NSKit GUI Backend
Library, and ‘<samp>-DW32_BACKEND_LIBRARY=1</samp>’ for the MediaBook WIN32
GUI Backend Library. <code>GUI_BACKEND_DEFINE</code> is not defined if
there is not backend library; i.e. <code>GUI_BACKEND_LIB</code> is
‘<samp>nil</samp>’.
</p></dd></dl>
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Next: <a href="Overridable-Flags.html#Overridable-Flags" accesskey="n" rel="next">Overridable Flags</a>, Previous: <a href="Platform-Information.html#Platform-Information" accesskey="p" rel="prev">Platform Information</a>, Up: <a href="Common-Variables.html#Common-Variables" accesskey="u" rel="up">Common Variables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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