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<title>Environment - Untitled</title>
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<a name="Environment"></a>Previous:&nbsp;<a rel="previous" accesskey="p" href="Options.html#Options">Options</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Invocation.html#Invocation">Invocation</a>
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<h3 class="section">2.2 Environment Variables</h3>
<!-- man begin ENVIRONMENT -->
<p>You can change the behaviour of <span class="command">ld</span> with the environment variables
<code>GNUTARGET</code>,
<code>LDEMULATION</code> and <code>COLLECT_NO_DEMANGLE</code>.
<p><a name="index-GNUTARGET-300"></a><a name="index-default-input-format-301"></a><code>GNUTARGET</code> determines the input-file object format if you don't
use <span class="samp">-b</span> (or its synonym <span class="samp">--format</span>). Its value should be one
of the BFD names for an input format (see <a href="BFD.html#BFD">BFD</a>). If there is no
<code>GNUTARGET</code> in the environment, <span class="command">ld</span> uses the natural format
of the target. If <code>GNUTARGET</code> is set to <code>default</code> then BFD
attempts to discover the input format by examining binary input files;
this method often succeeds, but there are potential ambiguities, since
there is no method of ensuring that the magic number used to specify
object-file formats is unique. However, the configuration procedure for
BFD on each system places the conventional format for that system first
in the search-list, so ambiguities are resolved in favor of convention.
<p><a name="index-LDEMULATION-302"></a><a name="index-default-emulation-303"></a><a name="index-emulation_002c-default-304"></a><code>LDEMULATION</code> determines the default emulation if you don't use the
<span class="samp">-m</span> option. The emulation can affect various aspects of linker
behaviour, particularly the default linker script. You can list the
available emulations with the <span class="samp">--verbose</span> or <span class="samp">-V</span> options. If
the <span class="samp">-m</span> option is not used, and the <code>LDEMULATION</code> environment
variable is not defined, the default emulation depends upon how the
linker was configured.
<p><a name="index-COLLECT_005fNO_005fDEMANGLE-305"></a><a name="index-demangling_002c-default-306"></a>Normally, the linker will default to demangling symbols. However, if
<code>COLLECT_NO_DEMANGLE</code> is set in the environment, then it will
default to not demangling symbols. This environment variable is used in
a similar fashion by the <code>gcc</code> linker wrapper program. The default
may be overridden by the <span class="samp">--demangle</span> and <span class="samp">--no-demangle</span>
options.
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