1<html lang="en"> 2<head> 3<title>MN10300 Options - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Submodel-Options.html#Submodel-Options" title="Submodel Options"> 9<link rel="prev" href="MMIX-Options.html#MMIX-Options" title="MMIX Options"> 10<link rel="next" href="PDP_002d11-Options.html#PDP_002d11-Options" title="PDP-11 Options"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 141998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 152010 Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation; with the 20Invariant Sections being ``Funding Free Software'', the Front-Cover 21Texts being (a) (see below), and with the Back-Cover Texts being (b) 22(see below). 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This is the default. 66 67 <br><dt><code>-mno-mult-bug</code><dd><a name="index-mno_002dmult_002dbug-1759"></a>Do not generate code to avoid bugs in the multiply instructions for the 68MN10300 processors. 69 70 <br><dt><code>-mam33</code><dd><a name="index-mam33-1760"></a>Generate code which uses features specific to the AM33 processor. 71 72 <br><dt><code>-mno-am33</code><dd><a name="index-mno_002dam33-1761"></a>Do not generate code which uses features specific to the AM33 processor. This 73is the default. 74 75 <br><dt><code>-mam33-2</code><dd><a name="index-mam33_002d2-1762"></a>Generate code which uses features specific to the AM33/2.0 processor. 76 77 <br><dt><code>-mam34</code><dd><a name="index-mam34-1763"></a>Generate code which uses features specific to the AM34 processor. 78 79 <br><dt><code>-mtune=</code><var>cpu-type</var><dd><a name="index-mtune-1764"></a>Use the timing characteristics of the indicated CPU type when 80scheduling instructions. This does not change the targeted processor 81type. The CPU type must be one of ‘<samp><span class="samp">mn10300</span></samp>’, ‘<samp><span class="samp">am33</span></samp>’, 82‘<samp><span class="samp">am33-2</span></samp>’ or ‘<samp><span class="samp">am34</span></samp>’. 83 84 <br><dt><code>-mreturn-pointer-on-d0</code><dd><a name="index-mreturn_002dpointer_002don_002dd0-1765"></a>When generating a function which returns a pointer, return the pointer 85in both <code>a0</code> and <code>d0</code>. Otherwise, the pointer is returned 86only in a0, and attempts to call such functions without a prototype 87would result in errors. Note that this option is on by default; use 88<samp><span class="option">-mno-return-pointer-on-d0</span></samp> to disable it. 89 90 <br><dt><code>-mno-crt0</code><dd><a name="index-mno_002dcrt0-1766"></a>Do not link in the C run-time initialization object file. 91 92 <br><dt><code>-mrelax</code><dd><a name="index-mrelax-1767"></a>Indicate to the linker that it should perform a relaxation optimization pass 93to shorten branches, calls and absolute memory addresses. This option only 94has an effect when used on the command line for the final link step. 95 96 <p>This option makes symbolic debugging impossible. 97 98 <br><dt><code>-mliw</code><dd><a name="index-mliw-1768"></a>Allow the compiler to generate <em>Long Instruction Word</em> 99instructions if the target is the ‘<samp><span class="samp">AM33</span></samp>’ or later. This is the 100default. This option defines the preprocessor macro ‘<samp><span class="samp">__LIW__</span></samp>’. 101 102 <br><dt><code>-mnoliw</code><dd><a name="index-mnoliw-1769"></a>Do not allow the compiler to generate <em>Long Instruction Word</em> 103instructions. This option defines the preprocessor macro 104‘<samp><span class="samp">__NO_LIW__</span></samp>’. 105 106 </dl> 107 108 </body></html> 109 110