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<h4 class="subsection">17.21.4 File Names in DBX Format</h4>
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<p>This describes file names in DBX format.
<div class="defun">
— Macro: <b>DBX_OUTPUT_MAIN_SOURCE_FILENAME</b> (<var>stream, name</var>)<var><a name="index-DBX_005fOUTPUT_005fMAIN_005fSOURCE_005fFILENAME-4776"></a></var><br>
<blockquote><p>A C statement to output DBX debugging information to the stdio stream
<var>stream</var>, which indicates that file <var>name</var> is the main source
file—the file specified as the input file for compilation.
This macro is called only once, at the beginning of compilation.
<p>This macro need not be defined if the standard form of output
for DBX debugging information is appropriate.
<p>It may be necessary to refer to a label equal to the beginning of the
text section. You can use ‘<samp><span class="samp">assemble_name (stream, ltext_label_name)</span></samp>’
to do so. If you do this, you must also set the variable
<var>used_ltext_label_name</var> to <code>true</code>.
</p></blockquote></div>
<div class="defun">
— Macro: <b>NO_DBX_MAIN_SOURCE_DIRECTORY</b><var><a name="index-NO_005fDBX_005fMAIN_005fSOURCE_005fDIRECTORY-4777"></a></var><br>
<blockquote><p>Define this macro, with value 1, if GCC should not emit an indication
of the current directory for compilation and current source language at
the beginning of the file.
</p></blockquote></div>
<div class="defun">
— Macro: <b>NO_DBX_GCC_MARKER</b><var><a name="index-NO_005fDBX_005fGCC_005fMARKER-4778"></a></var><br>
<blockquote><p>Define this macro, with value 1, if GCC should not emit an indication
that this object file was compiled by GCC. The default is to emit
an <code>N_OPT</code> stab at the beginning of every source file, with
‘<samp><span class="samp">gcc2_compiled.</span></samp>’ for the string and value 0.
</p></blockquote></div>
<div class="defun">
— Macro: <b>DBX_OUTPUT_MAIN_SOURCE_FILE_END</b> (<var>stream, name</var>)<var><a name="index-DBX_005fOUTPUT_005fMAIN_005fSOURCE_005fFILE_005fEND-4779"></a></var><br>
<blockquote><p>A C statement to output DBX debugging information at the end of
compilation of the main source file <var>name</var>. Output should be
written to the stdio stream <var>stream</var>.
<p>If you don't define this macro, nothing special is output at the end
of compilation, which is correct for most machines.
</p></blockquote></div>
<div class="defun">
— Macro: <b>DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END</b><var><a name="index-DBX_005fOUTPUT_005fNULL_005fN_005fSO_005fAT_005fMAIN_005fSOURCE_005fFILE_005fEND-4780"></a></var><br>
<blockquote><p>Define this macro <em>instead of</em> defining
<code>DBX_OUTPUT_MAIN_SOURCE_FILE_END</code>, if what needs to be output at
the end of compilation is an <code>N_SO</code> stab with an empty string,
whose value is the highest absolute text address in the file.
</p></blockquote></div>
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