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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="PDP-11%20Options">PDP-11 Options</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Xstormy16-Options.html#Xstormy16%20Options">Xstormy16 Options</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="MMIX-Options.html#MMIX%20Options">MMIX Options</a>,Up:&nbsp;<a rel="up" accesskey="u" href="Submodel-Options.html#Submodel%20Options">Submodel Options</a><hr><br></div><h3 class="subsection">PDP-11 Options</h4><p>These options are defined for the PDP-11:     <dl><dt><code>-mfpu</code>     <dd>Use hardware FPP floating point.  This is the default.  (FIS floatingpoint on the PDP-11/40 is not supported.)     <br><dt><code>-msoft-float</code>     <dd>Do not use hardware floating point.     <br><dt><code>-mac0</code>     <dd>Return floating-point results in ac0 (fr0 in Unix assembler syntax).     <br><dt><code>-mno-ac0</code>     <dd>Return floating-point results in memory.  This is the default.     <br><dt><code>-m40</code>     <dd>Generate code for a PDP-11/40.     <br><dt><code>-m45</code>     <dd>Generate code for a PDP-11/45.  This is the default.     <br><dt><code>-m10</code>     <dd>Generate code for a PDP-11/10.     <br><dt><code>-mbcopy-builtin</code>     <dd>Use inline <code>movstrhi</code> patterns for copying memory.  This is thedefault.     <br><dt><code>-mbcopy</code>     <dd>Do not use inline <code>movstrhi</code> patterns for copying memory.     <br><dt><code>-mint16</code>     <dd><dt><code>-mno-int32</code>     <dd>Use 16-bit <code>int</code>.  This is the default.     <br><dt><code>-mint32</code>     <dd><dt><code>-mno-int16</code>     <dd>Use 32-bit <code>int</code>.     <br><dt><code>-mfloat64</code>     <dd><dt><code>-mno-float32</code>     <dd>Use 64-bit <code>float</code>.  This is the default.     <br><dt><code>-mfloat32</code>     <dd><dt><code>-mno-float64</code>     <dd>Use 32-bit <code>float</code>.     <br><dt><code>-mabshi</code>     <dd>Use <code>abshi2</code> pattern.  This is the default.     <br><dt><code>-mno-abshi</code>     <dd>Do not use <code>abshi2</code> pattern.     <br><dt><code>-mbranch-expensive</code>     <dd>Pretend that branches are expensive.  This is for experimenting withcode generation only.     <br><dt><code>-mbranch-cheap</code>     <dd>Do not pretend that branches are expensive.  This is the default.     <br><dt><code>-msplit</code>     <dd>Generate code for a system with split I&amp;D.     <br><dt><code>-mno-split</code>     <dd>Generate code for a system without split I&amp;D.  This is the default.     <br><dt><code>-munix-asm</code>     <dd>Use Unix assembler syntax.  This is the default when configured for<code>pdp11-*-bsd</code>.     <br><dt><code>-mdec-asm</code>     <dd>Use DEC assembler syntax.  This is the default when configured for anyPDP-11 target other than <code>pdp11-*-bsd</code>. </dl>   </body></html>
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