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<p>
Previous: <a href="Common-Variables.html#Common-Variables" accesskey="p" rel="prev">Common Variables</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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<a name="Other-Variables-1"></a>
<h3 class="section">1.8 Other Variables</h3>
<p>Since gnustep-make is a system of scripts rather than compiled code,
all the source is always present and available to read, so the main
documentation is intentionally provided as comments within that source.
</p>
<p>In particular, gnustep-make variables are documented at the head of the
project-type files in which they are used.
eg $GNUSTEP_MAKEFILES/Instance/library.make for the variables
used to build a library.
</p>
<p>However, there are some variables which, while not in provided in
<samp>common.make</samp> are of more general use, and therefore may reasonably
be documented here:
</p>
<dl>
<dt><a name="index-GS_005fWITH_005fARC-1"></a>Variable: <strong>GS_WITH_ARC</strong></dt>
<dd><p><code>GS_WITH_ARC = 1</code> turns on ARC for the current build if using the
Next Generation runtime setting.
This variable may be defined as an environment variable, or on the make
command line, or (usually) at the start of GNUmakefile.
</p></dd></dl>
<p>The variable needs to be defined before <samp>common.make</samp> is included,
and the library-combo needs to be ng-gnu-gnu for it to take effect (in
which case it causes the -fobjc-arc flag to be used when compiling any
Objective-C source files).
Alternatively, to switch on ARC for individual files, you can have a makefile
fragment like this:
</p><div class="smallexample">
<pre class="smallexample">ifeq ($(OBJC_RUNTIME_LIB), ng)
file1.m_FILE_FLAGS+=-fobjc-arc
file2.m_FILE_FLAGS+=-fobjc-arc
file9.m_FILE_FLAGS+=-fobjc-arc
endif
</pre></div>
<dl>
<dt><a name="index-xxx_005fFILE_005fFILTER_005fOUT_005fFLAGS"></a>Variable: <strong>xxx_FILE_FILTER_OUT_FLAGS</strong></dt>
<dd><p><code>xxx_FILE_FILTER_OUT_FLAGS</code> (where xxx is the file name, such as mframe.m)
is a filter-out make pattern of flags to be filtered out
from the compilation flags when compiling xxx.
In exceptional conditions, you might need to want to use different compiler
flags for a file (for example, if a file doesn’t compile with optimization
turned on, you might want to compile that single file with optimizations
turned off).
</p></dd></dl>
<div class="smallexample">
<pre class="smallexample">file.m_FILE_FILTER_OUT_FLAGS = -O% -fomit-frame-pointer
</pre></div>
<p>This says that when compiling file.m we should disable optimization flags,
and also remove frame pointer information.
</p>
<dl>
<dt><a name="index-xxx_005fFILE_005fFLAGS"></a>Variable: <strong>xxx_FILE_FLAGS</strong></dt>
<dd><p><code>xxx_FILE_FLAGS</code> (where xxx is the file name, such as main.m)
add special compilation flags to be used when compiling xxx.
In exceptional conditions, you might need to want to use different compiler
flags for a file (for example, if ou want to turn on automated reference
counting for that file)
</p></dd></dl>
<div class="smallexample">
<pre class="smallexample">file.m_FILE_FLAGS = -fobjc-arc
</pre></div>
<p>This says that when compiling file.m we should turn on ARC.
</p>
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