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<h3 class="section">Environment Variables</h3>



   <p>You can change the behavior of <code>ld</code> with the environment variables

<code>GNUTARGET</code>, <code>LDEMULATION</code>, and <code>COLLECT_NO_DEMANGLE</code>.



   <p><code>GNUTARGET</code> determines the input-file object format if you don't

use <code>-b</code> (or its synonym <code>--format</code>).  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, <code>ld</code> 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><code>LDEMULATION</code> determines the default emulation if you don't use the

<code>-m</code> option.  The emulation can affect various aspects of linker

behaviour, particularly the default linker script.  You can list the

available emulations with the <code>--verbose</code> or <code>-V</code> options.  If

the <code>-m</code> 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>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 <code>--demangle</code> and <code>--no-demangle</code>

options.



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