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<title>GNU Compiler Collection (GCC) Internals: DBX Options</title>
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<a name="DBX-Options"></a>
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<div class="header">
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<p>
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Next: <a href="DBX-Hooks.html#DBX-Hooks" accesskey="n" rel="next">DBX Hooks</a>, Previous: <a href="All-Debuggers.html#All-Debuggers" accesskey="p" rel="prev">All Debuggers</a>, Up: <a href="Debugging-Info.html#Debugging-Info" accesskey="u" rel="up">Debugging Info</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Specific-Options-for-DBX-Output"></a>
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<h4 class="subsection">17.21.2 Specific Options for DBX Output</h4>
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<p>These are specific options for DBX output.
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</p>
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<dl>
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<dt><a name="index-DBX_005fDEBUGGING_005fINFO"></a>Macro: <strong>DBX_DEBUGGING_INFO</strong></dt>
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<dd><p>Define this macro if GCC should produce debugging output for DBX
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in response to the <samp>-g</samp> option.
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</p></dd></dl>
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<dl>
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<dt><a name="index-XCOFF_005fDEBUGGING_005fINFO"></a>Macro: <strong>XCOFF_DEBUGGING_INFO</strong></dt>
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<dd><p>Define this macro if GCC should produce XCOFF format debugging output
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in response to the <samp>-g</samp> option. This is a variant of DBX format.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DEFAULT_005fGDB_005fEXTENSIONS"></a>Macro: <strong>DEFAULT_GDB_EXTENSIONS</strong></dt>
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<dd><p>Define this macro to control whether GCC should by default generate
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GDB’s extended version of DBX debugging information (assuming DBX-format
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debugging information is enabled at all). If you don’t define the
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macro, the default is 1: always generate the extended information
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if there is any occasion to.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DEBUG_005fSYMS_005fTEXT"></a>Macro: <strong>DEBUG_SYMS_TEXT</strong></dt>
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<dd><p>Define this macro if all <code>.stabs</code> commands should be output while
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in the text section.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fSTABS_005fOP"></a>Macro: <strong>ASM_STABS_OP</strong></dt>
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<dd><p>A C string constant, including spacing, naming the assembler pseudo op to
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use instead of <code>"\t.stabs\t"</code> to define an ordinary debugging symbol.
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If you don’t define this macro, <code>"\t.stabs\t"</code> is used. This macro
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applies only to DBX debugging information format.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fSTABD_005fOP"></a>Macro: <strong>ASM_STABD_OP</strong></dt>
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<dd><p>A C string constant, including spacing, naming the assembler pseudo op to
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use instead of <code>"\t.stabd\t"</code> to define a debugging symbol whose
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value is the current location. If you don’t define this macro,
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<code>"\t.stabd\t"</code> is used. This macro applies only to DBX debugging
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information format.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fSTABN_005fOP"></a>Macro: <strong>ASM_STABN_OP</strong></dt>
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<dd><p>A C string constant, including spacing, naming the assembler pseudo op to
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use instead of <code>"\t.stabn\t"</code> to define a debugging symbol with no
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name. If you don’t define this macro, <code>"\t.stabn\t"</code> is used. This
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macro applies only to DBX debugging information format.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fNO_005fXREFS"></a>Macro: <strong>DBX_NO_XREFS</strong></dt>
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<dd><p>Define this macro if DBX on your system does not support the construct
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‘<samp>xs<var>tagname</var></samp>’. On some systems, this construct is used to
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describe a forward reference to a structure named <var>tagname</var>.
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On other systems, this construct is not supported at all.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fCONTIN_005fLENGTH"></a>Macro: <strong>DBX_CONTIN_LENGTH</strong></dt>
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<dd><p>A symbol name in DBX-format debugging information is normally
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continued (split into two separate <code>.stabs</code> directives) when it
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exceeds a certain length (by default, 80 characters). On some
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operating systems, DBX requires this splitting; on others, splitting
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must not be done. You can inhibit splitting by defining this macro
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with the value zero. You can override the default splitting-length by
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defining this macro as an expression for the length you desire.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fCONTIN_005fCHAR"></a>Macro: <strong>DBX_CONTIN_CHAR</strong></dt>
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<dd><p>Normally continuation is indicated by adding a ‘<samp>\</samp>’ character to
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the end of a <code>.stabs</code> string when a continuation follows. To use
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a different character instead, define this macro as a character
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constant for the character you want to use. Do not define this macro
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if backslash is correct for your system.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fSTATIC_005fSTAB_005fDATA_005fSECTION"></a>Macro: <strong>DBX_STATIC_STAB_DATA_SECTION</strong></dt>
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<dd><p>Define this macro if it is necessary to go to the data section before
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outputting the ‘<samp>.stabs</samp>’ pseudo-op for a non-global static
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variable.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fTYPE_005fDECL_005fSTABS_005fCODE"></a>Macro: <strong>DBX_TYPE_DECL_STABS_CODE</strong></dt>
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<dd><p>The value to use in the “code” field of the <code>.stabs</code> directive
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for a typedef. The default is <code>N_LSYM</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fSTATIC_005fCONST_005fVAR_005fCODE"></a>Macro: <strong>DBX_STATIC_CONST_VAR_CODE</strong></dt>
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<dd><p>The value to use in the “code” field of the <code>.stabs</code> directive
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for a static variable located in the text section. DBX format does not
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provide any “right” way to do this. The default is <code>N_FUN</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fREGPARM_005fSTABS_005fCODE"></a>Macro: <strong>DBX_REGPARM_STABS_CODE</strong></dt>
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<dd><p>The value to use in the “code” field of the <code>.stabs</code> directive
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for a parameter passed in registers. DBX format does not provide any
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“right” way to do this. The default is <code>N_RSYM</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fREGPARM_005fSTABS_005fLETTER"></a>Macro: <strong>DBX_REGPARM_STABS_LETTER</strong></dt>
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<dd><p>The letter to use in DBX symbol data to identify a symbol as a parameter
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passed in registers. DBX format does not customarily provide any way to
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do this. The default is <code>'P'</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fFUNCTION_005fFIRST"></a>Macro: <strong>DBX_FUNCTION_FIRST</strong></dt>
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<dd><p>Define this macro if the DBX information for a function and its
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arguments should precede the assembler code for the function. Normally,
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in DBX format, the debugging information entirely follows the assembler
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code.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fBLOCKS_005fFUNCTION_005fRELATIVE"></a>Macro: <strong>DBX_BLOCKS_FUNCTION_RELATIVE</strong></dt>
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<dd><p>Define this macro, with value 1, if the value of a symbol describing
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the scope of a block (<code>N_LBRAC</code> or <code>N_RBRAC</code>) should be
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relative to the start of the enclosing function. Normally, GCC uses
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an absolute address.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fLINES_005fFUNCTION_005fRELATIVE"></a>Macro: <strong>DBX_LINES_FUNCTION_RELATIVE</strong></dt>
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<dd><p>Define this macro, with value 1, if the value of a symbol indicating
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the current line number (<code>N_SLINE</code>) should be relative to the
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start of the enclosing function. Normally, GCC uses an absolute address.
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</p></dd></dl>
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<dl>
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<dt><a name="index-DBX_005fUSE_005fBINCL"></a>Macro: <strong>DBX_USE_BINCL</strong></dt>
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<dd><p>Define this macro if GCC should generate <code>N_BINCL</code> and
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<code>N_EINCL</code> stabs for included header files, as on Sun systems. This
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macro also directs GCC to output a type number as a pair of a file
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number and a type number within the file. Normally, GCC does not
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generate <code>N_BINCL</code> or <code>N_EINCL</code> stabs, and it outputs a single
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number for a type number.
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</p></dd></dl>
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<div class="header">
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<p>
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Next: <a href="DBX-Hooks.html#DBX-Hooks" accesskey="n" rel="next">DBX Hooks</a>, Previous: <a href="All-Debuggers.html#All-Debuggers" accesskey="p" rel="prev">All Debuggers</a>, Up: <a href="Debugging-Info.html#Debugging-Info" accesskey="u" rel="up">Debugging Info</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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