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<HTML><HEAD><TITLE>Installing GCC-2.95.3</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.63"><LINKREL="HOME"TITLE="Linux From Scratch"HREF="../index.html"><LINKREL="UP"TITLE="Preparing the LFS system"HREF="../chapter05/chapter05.html"><LINKREL="PREVIOUS"TITLE="Installing Fileutils-4.1"HREF="../chapter05/fileutils.html"><LINKREL="NEXT"TITLE="Installing Grep-2.4.2"HREF="../chapter05/grep.html"></HEAD><BODYCLASS="sect1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">Linux From Scratch: Version 3.1</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="../chapter05/fileutils.html">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 5. Preparing the LFS system</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="../chapter05/grep.html">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="sect1"><H1CLASS="sect1"><ANAME="ch05-gcc">5.9. Installing GCC-2.95.3</A></H1><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><FONTCOLOR="#000000"><PRECLASS="screen">Estimated build time: 22 minutesEstimated required disk space: 168 MB</PRE></FONT></TD></TR></TABLE><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN1105">5.9.1. Installation of GCC</A></H2><P>This package is known to behave badly when you have changed its defaultoptimization flags (including the -march and -mcpu options). GCC is bestleft alone, so we recommend you unsetting CFLAGS, CXXFLAGS and othersuch variables/settings that would change the default optimization thatit comes with.</P><P>Install GCC by running the following commands:</P><P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><FONTCOLOR="#000000"><PRECLASS="screen"><TTCLASS="userinput"><B>patch -Np1 -i ../gcc-2.95.3-2.patch &&mkdir ../gcc-build &&cd ../gcc-build &&../gcc-2.95.3/configure --prefix=/usr --enable-languages=c,c++ \牋⌨️ 快捷键说明
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