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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 © 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: <a name="M32R%2fD%20Options">M32R/D Options</a>,Next: <a rel="next" accesskey="n" href="RS-6000-and-PowerPC-Options.html#RS%2f6000%20and%20PowerPC%20Options">RS/6000 and PowerPC Options</a>,Previous: <a rel="previous" accesskey="p" href="MN10300-Options.html#MN10300%20Options">MN10300 Options</a>,Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel%20Options">Submodel Options</a><hr><br></div><h3 class="subsection">M32R/D Options</h4><p>These <code>-m</code> options are defined for Renesas M32R/D architectures: <dl><dt><code>-m32r2</code> <dd>Generate code for the M32R/2. <br><dt><code>-m32rx</code> <dd>Generate code for the M32R/X. <br><dt><code>-m32r</code> <dd>Generate code for the M32R. This is the default. <br><dt><code>-mmodel=small</code> <dd>Assume all objects live in the lower 16MB of memory (so that their addressescan be loaded with the <code>ld24</code> instruction), and assume all subroutinesare reachable with the <code>bl</code> instruction. This is the default. <p>The addressability of a particular object can be set with the<code>model</code> attribute. <br><dt><code>-mmodel=medium</code> <dd>Assume objects may be anywhere in the 32-bit address space (the compilerwill generate <code>seth/add3</code> instructions to load their addresses), andassume all subroutines are reachable with the <code>bl</code> instruction. <br><dt><code>-mmodel=large</code> <dd>Assume objects may be anywhere in the 32-bit address space (the compilerwill generate <code>seth/add3</code> instructions to load their addresses), andassume subroutines may not be reachable with the <code>bl</code> instruction(the compiler will generate the much slower <code>seth/add3/jl</code>instruction sequence). <br><dt><code>-msdata=none</code> <dd>Disable use of the small data area. Variables will be put intoone of <code>.data</code>, <code>bss</code>, or <code>.rodata</code> (unless the<code>section</code> attribute has been specified). This is the default. <p>The small data area consists of sections <code>.sdata</code> and <code>.sbss</code>. Objects may be explicitly put in the small data area with the<code>section</code> attribute using one of these sections. <br><dt><code>-msdata=sdata</code> <dd>Put small global and static data in the small data area, but do notgenerate special code to reference them. <br><dt><code>-msdata=use</code> <dd>Put small global and static data in the small data area, and generatespecial instructions to reference them. <br><dt><code>-G </code><var>num</var><code></code> <dd>Put global and static objects less than or equal to <var>num</var> bytesinto the small data or bss sections instead of the normal data or bsssections. The default value of <var>num</var> is 8. The <code>-msdata</code> option must be set to one of <code>sdata</code> or <code>use</code>for this option to have any effect. <p>All modules should be compiled with the same <code>-G </code><var>num</var><code></code> value. Compiling with different values of <var>num</var> may or may not work; if itdoesn't the linker will give an error message--incorrect code will not begenerated. <br><dt><code>-mdebug</code> <dd>Makes the M32R specific code in the compiler display some statisticsthat might help in debugging programs. <br><dt><code>-malign-loops</code> <dd>Align all loops to a 32-byte boundary. <br><dt><code>-mno-align-loops</code> <dd>Do not enforce a 32-byte alignment for loops. This is the default. <br><dt><code>-missue-rate=</code><var>number</var><code></code> <dd>Issue <var>number</var> instructions per cycle. <var>number</var> can only be 1or 2. <br><dt><code>-mbranch-cost=</code><var>number</var><code></code> <dd><var>number</var> can only be 1 or 2. If it is 1 then branches will bepreferred over conditional code, if it is 2, then the opposite willapply. <br><dt><code>-mflush-trap=</code><var>number</var><code></code> <dd>Specifies the trap number to use to flush the cache. The default is12. Valid numbers are between 0 and 15 inclusive. <br><dt><code>-mno-flush-trap</code> <dd>Specifies that the cache cannot be flushed by using a trap. <br><dt><code>-mflush-func=</code><var>name</var><code></code> <dd>Specifies the name of the operating system function to call to flushthe cache. The default is <em>_flush_cache</em>, but a function callwill only be used if a trap is not available. <br><dt><code>-mno-flush-func</code> <dd>Indicates that there is no OS function for flushing the cache. </dl> </body></html>⌨️ 快捷键说明
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