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📁 自己收集的linux入门到学懂高级编程书集包括linux程序设计第三版
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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="SH%20Options">SH Options</a>,Next:&nbsp;<a rel="next" accesskey="n" href="System-V-Options.html#System%20V%20Options">System V Options</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="H8-300-Options.html#H8%2f300%20Options">H8/300 Options</a>,Up:&nbsp;<a rel="up" accesskey="u" href="Submodel-Options.html#Submodel%20Options">Submodel Options</a><hr><br></div><h3 class="subsection">SH Options</h4><p>These <code>-m</code> options are defined for the SH implementations:     <dl><dt><code>-m1</code>     <dd>Generate code for the SH1.     <br><dt><code>-m2</code>     <dd>Generate code for the SH2.     <br><dt><code>-m2e</code>     <dd>Generate code for the SH2e.     <br><dt><code>-m3</code>     <dd>Generate code for the SH3.     <br><dt><code>-m3e</code>     <dd>Generate code for the SH3e.     <br><dt><code>-m4-nofpu</code>     <dd>Generate code for the SH4 without a floating-point unit.     <br><dt><code>-m4-single-only</code>     <dd>Generate code for the SH4 with a floating-point unit that onlysupports single-precision arithmetic.     <br><dt><code>-m4-single</code>     <dd>Generate code for the SH4 assuming the floating-point unit is insingle-precision mode by default.     <br><dt><code>-m4</code>     <dd>Generate code for the SH4.     <br><dt><code>-mb</code>     <dd>Compile code for the processor in big endian mode.     <br><dt><code>-ml</code>     <dd>Compile code for the processor in little endian mode.     <br><dt><code>-mdalign</code>     <dd>Align doubles at 64-bit boundaries.  Note that this changes the callingconventions, and thus some functions from the standard C library willnot work unless you recompile it first with <code>-mdalign</code>.     <br><dt><code>-mrelax</code>     <dd>Shorten some address references at link time, when possible; uses thelinker option <code>-relax</code>.     <br><dt><code>-mbigtable</code>     <dd>Use 32-bit offsets in <code>switch</code> tables.  The default is to use16-bit offsets.     <br><dt><code>-mfmovd</code>     <dd>Enable the use of the instruction <code>fmovd</code>.     <br><dt><code>-mhitachi</code>     <dd>Comply with the calling conventions defined by Renesas.     <br><dt><code>-mnomacsave</code>     <dd>Mark the <code>MAC</code> register as call-clobbered, even if<code>-mhitachi</code> is given.     <br><dt><code>-mieee</code>     <dd>Increase IEEE-compliance of floating-point code.     <br><dt><code>-misize</code>     <dd>Dump instruction size and location in the assembly code.     <br><dt><code>-mpadstruct</code>     <dd>This option is deprecated.  It pads structures to multiple of 4 bytes,which is incompatible with the SH ABI.     <br><dt><code>-mspace</code>     <dd>Optimize for space instead of speed.  Implied by <code>-Os</code>.     <br><dt><code>-mprefergot</code>     <dd>When generating position-independent code, emit function calls usingthe Global Offset Table instead of the Procedure Linkage Table.     <br><dt><code>-musermode</code>     <dd>Generate a library function call to invalidate instruction cacheentries, after fixing up a trampoline.  This library function calldoesn't assume it can write to the whole memory address space.  Thisis the default when the target is <code>sh-*-linux*</code>. </dl>   </body></html>
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