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| 2 | <head> |
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| 3 | <title> |
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| 4 | A Tour of NTL: Obtaining and Installing NTL for UNIX </title> |
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| 5 | </head> |
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| 6 | |
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| 7 | <body bgcolor="#fff9e6"> |
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| 8 | <center> |
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| 9 | <a href="tour-stdcxx.html"><img src="arrow1.gif" alt="[Previous]" align=bottom></a> |
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| 12 | </center> |
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| 13 | |
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| 14 | <h1> |
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| 15 | <p align=center> |
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| 16 | A Tour of NTL: Obtaining and Installing NTL for UNIX |
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| 17 | </p> |
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| 18 | </h1> |
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| 19 | |
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| 20 | <p> <hr> <p> |
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| 21 | |
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| 22 | This procedure should work on most Unix or Unix-like platorms |
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| 23 | (including Mac OSX, and Windows with Cygwin tools). |
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| 24 | |
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| 25 | <p> |
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| 26 | |
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| 27 | |
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| 28 | To obtain the source code and documentation for NTL, |
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| 29 | <a href="http://www.shoup.net/ntl/download.html"> |
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| 30 | download <tt>ntl-xxx.tar.gz</tt></a>, |
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| 31 | placing it a directory, and then, working in this directory, |
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| 32 | do the following. |
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| 33 | Here, "<tt>xxx</tt>" denotes the current version number. |
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| 34 | |
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| 35 | |
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| 36 | |
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| 37 | <p> |
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| 38 | <pre> |
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| 39 | % gunzip ntl-xxx.tar.gz |
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| 40 | % tar xf ntl-xxx.tar |
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| 41 | % cd ntl-xxx/src |
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| 42 | % ./configure PREFIX=$HOME/sw |
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| 43 | % make |
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| 44 | % make check |
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| 45 | % make install |
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| 46 | </pre> |
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| 47 | |
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| 48 | This will build, test, and install NTL in <tt>$HOME/sw</tt>. |
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| 49 | Of course, change <tt>$HOME/sw</tt> to whatever you want (the default is |
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| 50 | <tt>/usr/local</tt>). |
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| 51 | You will find the NTL header files in <tt>$HOME/sw/include/NTL</tt> |
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| 52 | and the compiled binary |
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| 53 | in <tt>$HOME/sw/lib/libntl.a</tt> |
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| 54 | (this is a <i>static</i> library -- if you want a <i>shared</i> |
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| 55 | library, <a href="#shared">see below</a>). |
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| 56 | <p> |
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| 57 | If you really are interested in high-performace, you will |
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| 58 | <i>definitely</i> want to build NTL |
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| 59 | using GMP (the GNU Multi-Precision package). |
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| 60 | If GMP has already been installed in a standard |
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| 61 | place, like <tt>/usr/local</tt>, then invoke <tt>configure</tt> |
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| 62 | above as |
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| 63 | <pre> |
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| 64 | % ./configure PREFIX=$HOME/sw NTL_GMP_LIP=on |
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| 65 | </pre> |
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| 66 | and if GMP is installed somewhere else, say <tt>$HOME/sw</tt>, then |
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| 67 | either |
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| 68 | <pre> |
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| 69 | % ./configure PREFIX=$HOME/sw NTL_GMP_LIP=on GMP_PREFIX=$HOME/sw |
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| 70 | </pre> |
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| 71 | or, more simply, |
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| 72 | <pre> |
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| 73 | % ./configure DEF_PREFIX=$HOME/sw NTL_GMP_LIP=on |
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| 74 | </pre> |
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| 75 | does the job. |
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| 76 | Here, <tt>DEF_PREFIX</tt> is a variable that is used |
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| 77 | to specify the location of all software, |
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| 78 | and it defaults to <tt>/usr/local</tt>. |
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| 79 | <a href="tour-gmp.html">This page</a> provides more |
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| 80 | details. |
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| 81 | |
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| 82 | <p> |
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| 83 | If you want very high-performance for polynomial arithmetic |
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| 84 | over <i>GF(2)</i>, you may want to consider using the <tt>gf2x</tt> library. |
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| 85 | To do this, <tt>gf2x</tt> must already be installed somewhere. |
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| 86 | In addition, you should invoke <tt>configure</tt> |
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| 87 | with the option <tt>NTL_GF2X_LIB=on</tt>. |
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| 88 | If <tt>gf2x</tt> is installed in a standard location, this is |
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| 89 | all you need to do; |
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| 90 | otherwise, if <tt>gf2x</tt> is installed, say, in <tt>$HOME/sw</tt>, |
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| 91 | then you also need to pass the option <tt>GF2X_PREFIX=$HOME/sw</tt>. |
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| 92 | <a href="tour-gf2x.html">This page</a> provides more details. |
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| 93 | |
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| 94 | |
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| 95 | |
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| 96 | |
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| 97 | <p> |
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| 98 | Now suppose you want to compile a program that uses NTL. |
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| 99 | Suppose you are working in some directory and <tt>foo.c</tt> |
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| 100 | is your program. |
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| 101 | Assume that you have installed NTL in <tt>$HOME/sw</tt> as above. |
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| 102 | The following should work: |
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| 103 | <pre> |
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| 104 | % g++ -I$HOME/sw/include foo.c -o foo -L$HOME/sw/lib -lntl -lm |
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| 105 | </pre> |
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| 106 | If you are using GMP, then: |
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| 107 | <pre> |
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| 108 | % g++ -I$HOME/sw/include foo.c -o foo -L$HOME/sw/lib -lntl -lgmp -lm |
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| 109 | </pre> |
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| 110 | If you are using GMP and <tt>gf2x</tt>, then |
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| 111 | <pre> |
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| 112 | % g++ -I$HOME/sw/include foo.c -o foo -L$HOME/sw/lib -lntl -lgmp -lgf2x -lm |
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| 113 | </pre> |
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| 114 | |
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| 115 | |
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| 116 | <p> |
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| 117 | <h2> |
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| 118 | More Details |
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| 119 | </h2> |
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| 120 | <p> |
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| 121 | What follows is a more detailed description of the installation process. |
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| 122 | |
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| 123 | |
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| 124 | |
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| 125 | |
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| 126 | <p> |
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| 127 | <b>Step 1.</b> |
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| 128 | Extract the source files by executing: |
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| 129 | <pre> |
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| 130 | % gunzip ntl-xxx.tar.gz |
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| 131 | % tar xvf ntl-xxx.tar |
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| 132 | </pre> |
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| 133 | |
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| 134 | <p> |
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| 135 | Note that this will unpack everything into a sub-directory <tt>ntl-xxx</tt>, |
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| 136 | creating this directory if necessary. |
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| 137 | Next: |
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| 138 | <pre> |
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| 139 | % cd ntl-xxx |
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| 140 | % ls |
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| 141 | </pre> |
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| 142 | You should see a file "<tt>README</tt>", and directories |
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| 143 | "<tt>include</tt>", "<tt>doc</tt>", and "<tt>src</tt>". |
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| 144 | The directory "<tt>doc</tt>" contains all the documentation. |
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| 145 | The file "<tt>doc/tour.html</tt>" contains a copy of the on-line documentation. |
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| 146 | The directory "<tt>include</tt>" |
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| 147 | contains all the header files within a subdirectory |
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| 148 | "<tt>include/NTL</tt>". |
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| 149 | The directory "<tt>src</tt>" contains everything else. |
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| 150 | Go there now: |
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| 151 | <pre> |
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| 152 | % cd src |
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| 153 | </pre> |
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| 154 | |
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| 155 | <p> |
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| 156 | <b>Step 2.</b> |
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| 157 | Run the configuration script. |
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| 158 | |
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| 159 | <p> |
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| 160 | Execute the command |
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| 161 | <pre> |
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| 162 | % ./configure [ variable=value ]... |
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| 163 | </pre> |
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| 164 | |
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| 165 | This configure script generates the file "<tt>makefile</tt>" and the file |
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| 166 | "<tt>../include/NTL/config.h</tt>", based upon the values assigned to the |
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| 167 | variables on the command line. |
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| 168 | |
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| 169 | |
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| 170 | <p> |
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| 171 | |
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| 172 | Here are the most important variables, and their default values. |
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| 173 | |
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| 174 | <p> |
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| 175 | <pre> |
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| 176 | CC=gcc # The C compiler |
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| 177 | CXX=g++ # The C++ compiler |
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| 178 | CFLAGS=-O2 # C complilation flags |
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| 179 | CXXFLAGS=$(CFLAGS) # C++ compilation flags (by default, same as CFLAGS) |
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| 180 | |
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| 181 | DEF_PREFIX=/usr/local # Default software directory |
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| 182 | PREFIX=$(DEF_PREFIX) # Directory in which to install NTL library components |
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| 183 | SHARED=off # Generate a shared library (as well as static) |
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| 184 | |
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| 185 | NTL_STD_CXX=on # ISO Mode switch |
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| 186 | |
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| 187 | NTL_GMP_LIP=off # Switch to enable the use of GMP as primary |
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| 188 | # long integer package |
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| 189 | |
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| 190 | GMP_PREFIX=$(DEF_PREFIX) # Directory in which GMP components are installed |
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| 191 | |
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| 192 | NTL_GF2X_LIB=off # Switch to enable the use of the gf2x package |
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| 193 | # for faster arithmetic over GF(2)[X] |
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| 194 | |
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| 195 | GF2X_PREFIX=$(DEF_PREFIX) # Directory in which gf2x components are installed |
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| 196 | </pre> |
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| 197 | |
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| 198 | <p> |
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| 199 | <i>Examples.</i> |
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| 200 | <p> |
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| 201 | |
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| 202 | <ul> |
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| 203 | <li> |
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| 204 | If you are happy with all the default values, run: |
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| 205 | <pre> |
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| 206 | % ./configure |
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| 207 | </pre> |
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| 208 | Actually, the initially installed <tt>makefile</tt> and <tt>config.h</tt> files |
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| 209 | already reflect the default values, and you do not have to even run |
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| 210 | the configure script. |
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| 211 | |
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| 212 | <p> |
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| 213 | <li> |
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| 214 | If your C/C++ compilers are called cc/CC, run: |
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| 215 | <pre> |
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| 216 | % ./configure CC=cc CXX=CC |
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| 217 | </pre> |
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| 218 | |
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| 219 | <p> |
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| 220 | <li> |
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| 221 | If you want to use, say, the options <tt>-g</tt> and <tt>-O</tt> for |
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| 222 | compiling <tt>C</tt> and <tt>C++</tt>, run: |
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| 223 | <pre> |
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| 224 | % ./configure "CFLAGS=-g -O" |
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| 225 | </pre> |
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| 226 | Note the use of quotes to keep the argument in one piece. |
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| 227 | |
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| 228 | <p> |
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| 229 | <li> |
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| 230 | If <a href="tour-gmp.html">GMP (the GNU Multi-Precision package)</a> |
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| 231 | is installed in a standard system directory, and you want to use it |
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| 232 | to obtain better performance for long integer arithemtic, run: |
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| 233 | <pre> |
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| 234 | % ./configure NTL_GMP_LIP=on |
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| 235 | </pre> |
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| 236 | If GMP was installed in |
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| 237 | <tt>$HOME/sw</tt>, |
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| 238 | run: |
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| 239 | <pre> |
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| 240 | % ./configure NTL_GMP_LIP=on GMP_PREFIX=$HOME/sw |
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| 241 | </pre> |
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| 242 | Go <a href="tour-gmp.html">here</a> for complete details. |
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| 243 | |
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| 244 | |
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| 245 | <p> |
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| 246 | <li> |
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| 247 | If <a href="tour-gf2x.html"><tt>gf2x</tt></a> |
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| 248 | is installed in a standard system directory, and you want to use it |
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| 249 | to obtain better performance for polynomial arithemtic over <i>GF(2)</i>, |
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| 250 | run: |
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| 251 | <pre> |
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| 252 | % ./configure NTL_GF2X_LIB=on |
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| 253 | </pre> |
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| 254 | If <tt>gf2x</tt> was installed in |
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| 255 | <tt>$HOME/sw</tt>, |
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| 256 | run: |
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| 257 | <pre> |
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| 258 | % ./configure NTL_GF2X_LIB=on GF2X_PREFIX=$HOME/sw |
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| 259 | </pre> |
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| 260 | Go <a href="tour-gf2x.html">here</a> for complete details. |
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| 261 | |
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| 262 | <p> |
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| 263 | <li> |
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| 264 | If you want to use |
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| 265 | <a href="tour-stdcxx.html">traditional rather than ISO mode</a>, run: |
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| 266 | <pre> |
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| 267 | % ./configure NTL_STD_CXX=off |
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| 268 | </pre> |
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| 269 | |
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| 270 | <p> |
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| 271 | <li> |
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| 272 | If you want to install NTL in the directory <tt>$HOME/sw</tt>, |
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| 273 | run: |
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| 274 | <pre> |
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| 275 | % ./configure PREFIX=$HOME/sw |
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| 276 | </pre> |
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| 277 | </ul> |
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| 278 | |
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| 279 | <p> |
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| 280 | There are a number of more esoteric configuration variables that can be set. |
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| 281 | See <a href="config.txt"><tt>config.txt</tt></a> for a complete |
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| 282 | description. |
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| 283 | |
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| 284 | <p> |
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| 285 | Note that all of these configuration options can also be set |
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| 286 | by editing the two files <tt>makefile</tt> |
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| 287 | and <tt>../include/NTL/def_config.h</tt> by hand. |
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| 288 | These files are fairly simple and well documented, and so this is not |
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| 289 | too hard to do. |
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| 290 | |
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| 291 | <p> |
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| 292 | Note that the file "<tt>../include/NTL/def_config.h</tt>" |
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| 293 | contains a backup copy of the original <tt>config.h</tt> file, |
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| 294 | and that the file "<tt>def_makefile</tt>" |
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| 295 | contains a backup copy of the original <tt>makefile</tt> file. |
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| 296 | |
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| 297 | <p> |
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| 298 | This command is intended only as a convenience |
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| 299 | and -- more importantly -- to allow the configuration process |
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| 300 | to be script driven. |
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| 301 | This script does not perform any "magic", like finding out what |
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| 302 | the local C compiler is called, etc. |
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| 303 | If the defaults are not |
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| 304 | correct for your platform, you have to set an appropriate variable. |
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| 305 | |
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| 306 | |
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| 307 | |
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| 308 | <p> |
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| 309 | <b>Step 3.</b> |
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| 310 | Execute <tt>make</tt>. |
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| 311 | |
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| 312 | <p> |
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| 313 | Just type: |
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| 314 | <pre> |
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| 315 | % make |
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| 316 | </pre> |
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| 317 | |
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| 318 | <p> |
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| 319 | The build process after this point is fully automatic. |
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| 320 | But here is a description of what happens. |
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| 321 | |
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| 322 | <p> |
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| 323 | |
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| 324 | <ol> |
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| 325 | <li> |
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| 326 | The makefile |
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| 327 | builds the file "<tt>../include/NTL/mach_desc.h</tt>", which defines some machine characteristics |
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| 328 | such as word size and machine precision. |
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| 329 | This is done by compiling and running a <tt>C</tt> program |
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| 330 | called <tt>MakeDesc</tt> |
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| 331 | that figures out these characteristics on its |
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| 332 | own, and prints some diagnostics to the terminal. |
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| 333 | |
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| 334 | <p> |
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| 335 | <li> |
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| 336 | A script is run that "automagically" |
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| 337 | determines the best way to write a timing function |
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| 338 | on your platform. |
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| 339 | It tries different routines in the files <tt>GetTime1.c</tt>, |
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| 340 | <tt>GetTime2.c</tt>, etc., and when it finds a good one, |
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| 341 | it copies the file into <tt>GetTime.c</tt>. |
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| 342 | |
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| 343 | <p> |
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| 344 | <li> |
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| 345 | The files "<tt>lip_gmp_aux_impl.h</tt>" and "<tt>../include/NTL/gmp_aux.h</tt>" |
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| 346 | are generated for use with GMP. |
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| 347 | If not using GMP, these files are still created, but they are empty. |
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| 348 | |
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| 349 | |
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| 350 | <p> |
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| 351 | <li> |
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| 352 | The configuration wizard script is run. |
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| 353 | This script works in a sub-directory, |
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| 354 | compiling several programs, |
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| 355 | and performing a number of timing experiments, |
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| 356 | in order to determine the optimal setting for a number of flags |
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| 357 | in the file <tt>../include/NTL/config.h</tt>. |
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| 358 | When the script finishes (it may take several minutes), |
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| 359 | you will be told what the wizard thinks are the best settings, |
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| 360 | and your <tt>config.h</tt> file will be automatically updated. |
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| 361 | Note that any flags you set in Step 2 |
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| 362 | will be in |
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| 363 | effect while the wizard runs, and will be retained in the updated |
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| 364 | <tt>config.h</tt> file, with the exception of the flags |
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| 365 | <pre> |
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| 366 | NTL_LONG_LONG NTL_AVOID_FLOAT NTL_TBL_REM NTL_AVOID_BRANCHING |
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| 367 | NTL_SPMM_UL NTL_SPMM_ULL NTL_SPMM_ASM NTL_GF2X_NOINLINE NTL_GF2X_ALTCODE |
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| 368 | </pre> |
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| 369 | which are set by the wizard. |
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| 370 | Also note that if you <i>do not</i> want the wizard to run, |
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| 371 | you should pass <tt>WIZARD=off</tt> to the configure script; |
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| 372 | however, this is not recommended. |
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| 373 | |
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| 374 | <p> |
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| 375 | <li> |
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| 376 | The makefile will compile all the source files, |
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| 377 | and then creates the library "<tt>ntl.a</tt>" in the current directory. |
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| 378 | </ol> |
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| 379 | |
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| 380 | <p> |
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| 381 | Note that for finer control you can optionally break up this process |
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| 382 | into the five |
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| 383 | component steps: |
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| 384 | <pre> |
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| 385 | % make setup1 |
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| 386 | % make setup2 |
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| 387 | % make setup3 |
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| 388 | % make setup4 |
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| 389 | % make ntl.a |
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| 390 | </pre> |
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| 391 | |
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| 392 | |
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| 393 | <p> |
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| 394 | |
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| 395 | <p> |
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| 396 | <b>After NTL is built.</b> |
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| 397 | |
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| 398 | <p> |
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| 399 | Executing <tt>make check</tt> runs a series of timing and test programs. |
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| 400 | It is a good idea to run this to see if everything really |
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| 401 | went well. |
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| 402 | |
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| 403 | <p> |
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| 404 | Executing <tt>make install</tt> |
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| 405 | copies a number of files to a directory <tt><prefix></tt> that you |
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| 406 | specify by passing <tt>PREFIX=<prefix></tt> |
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| 407 | as an argument to <tt>configure</tt> at configuration time, |
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| 408 | or as an argument to <tt>make install</tt> at installation time. |
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| 409 | The default is <tt>/usr/local</tt>, so either you need root |
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| 410 | permissions, or you choose a <tt><prefix></tt> for which |
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| 411 | you have write permission. |
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| 412 | The files <tt>../include/NTL/*</tt> are copied into |
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| 413 | <tt><prefix>/include/NTL</tt>. |
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| 414 | The file <tt>ntl.a</tt> is copied to <tt><prefix>/lib/libntl.a</tt>. |
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| 415 | The files <tt>../doc/*</tt> are copied into |
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| 416 | <tt><prefix>/share/doc/NTL</tt>. |
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| 417 | |
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| 418 | <p> |
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| 419 | You can also "fine tune" the installation procedure further. |
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| 420 | See the <a href="config.txt">configure documentation</a> for details. |
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| 421 | |
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| 422 | <p> |
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| 423 | Executing <tt>make uninstall</tt> undoes <tt>make install</tt>. |
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| 424 | |
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| 425 | |
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| 426 | <p> |
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| 427 | Executing <tt>make clobber</tt> essentially |
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| 428 | undoes <tt>make</tt>. |
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| 429 | <i>Make sure you do this if you re-build NTL for a different architecture!</i> |
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| 430 | |
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| 431 | <p> |
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| 432 | Executing <tt>make clean</tt> will remove object files, but not |
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| 433 | <tt>ntl.a</tt>. |
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| 434 | To rebuild after executing <tt>make clean</tt>, execute <tt>make ntl.a</tt>. |
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| 435 | |
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| 436 | |
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| 437 | <p> |
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| 438 | Assuming you have installed NTL as above, |
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| 439 | to compile a program <tt>foo.c</tt> that uses NTL, |
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| 440 | execute |
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| 441 | <pre> |
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| 442 | g++ -I<prefix>/include foo.c -o foo -L<prefix>/lib -lntl -lm |
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| 443 | </pre> |
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| 444 | This compiles <tt>foo.c</tt> as a <tt>C++</tt> program |
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| 445 | and creates the binary <tt>foo</tt>. |
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| 446 | <p> |
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| 447 | If you built NTL using <a href="tour-gmp.html">GMP</a>, execute: |
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| 448 | <pre> |
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| 449 | g++ -I<prefix>/include foo.c -o foo -L<prefix>/lib -lntl -L<gmp_prefix>/lib -lgmp -lm |
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| 450 | </pre> |
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| 451 | <p> |
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| 452 | Of course, if <tt><prefix></tt> and <tt><gmp_prefix></tt> |
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| 453 | are the same, you do not need to duplicate the <tt>-L</tt> |
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| 454 | flags, and if either are standard directories, like <tt>/usr/local</tt>, |
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| 455 | you can leave out the corresponding <tt>-I</tt> and <tt>-L</tt> |
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| 456 | flags altogether. |
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| 457 | <p> |
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| 458 | Similarly, if you built NTL using <a href="tour-gf2x.html"><tt>gf2x</tt></a>, |
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| 459 | you should include flags |
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| 460 | <pre> |
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| 461 | -L<gf2x_prefix>/lib -lgf2x |
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| 462 | </pre> |
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| 463 | on the command line. |
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| 464 | <p> |
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| 465 | This works even if you are not working in the directory |
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| 466 | in which you built NTL. |
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| 467 | If you <i>are</i> working in that directory, you can just execute |
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| 468 | <pre> |
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| 469 | make foo |
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| 470 | </pre> |
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| 471 | |
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| 472 | <p> |
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| 473 | <h2> |
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| 474 | <a name="shared"> |
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| 475 | Building a Shared Library |
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| 476 | </a> |
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| 477 | </h2> |
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| 478 | <p> |
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| 479 | |
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| 480 | |
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| 481 | By default, the above installation procedure builds |
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| 482 | a <i>static</i> library only. |
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| 483 | Static libraries are nice because the procedures for building |
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| 484 | and using them are nearly identical across various flavors |
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| 485 | of Unix. |
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| 486 | However, static libraries have their drawbacks, and sometimes |
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| 487 | it is desirable to build a <i>shared</i> library. |
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| 488 | This can be done (in theory) by simply passing <tt>SHARED=on</tt> to |
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| 489 | NTL's <tt>configure</tt>. |
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| 490 | |
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| 491 | <p> |
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| 492 | If you set <tt>SHARED=on</tt>, then behind the scenes, |
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| 493 | the procedure used by the <tt>makefile</tt> changes a bit. |
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| 494 | In particular, the magical GNU program <tt>libtool</tt> is used |
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| 495 | to deal with all idiosyncracies of shared libraries. |
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| 496 | You may need to set the |
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| 497 | configuration variable <tt>LIBTOOL</tt>, to point to another version of |
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| 498 | <tt>libtool</tt>. |
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| 499 | For example, on <i>Mac OSX</i>, the built-in command called <tt>libtool</tt> |
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| 500 | is not |
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| 501 | actually the GNU <tt>libtool</tt> program; |
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| 502 | in this case, you will want to set |
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| 503 | <tt>LIBTOOL=glibtool</tt>. |
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| 504 | On other systems, it may be necssary to downlaod and |
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| 505 | install a fresh copy of the libtool program (which can be obtained from |
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| 506 | <a href="http://www.gnu.org/software/libtool">here</a>). |
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| 507 | Note that if <tt>SHARED=on</tt>, then |
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| 508 | in addition to using the <tt>libtool</tt> program, the <tt>makefile</tt> |
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| 509 | relies on |
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| 510 | features specific to GNU make. |
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| 511 | |
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| 512 | <p> |
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| 513 | Note that if you want to build NTL as a shared library, |
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| 514 | then if you use them, GMP and <tt>gf2x</tt> must also |
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| 515 | be built and installed as shared libraries. |
|---|
| 516 | Also note that to use a shared library version of NTL, |
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| 517 | you may have to do something special, like set a special |
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| 518 | shell variable: the output generated by the <tt>libtool</tt> |
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| 519 | program during <tt>make install</tt> should give specific |
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| 520 | instructions. |
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| 521 | In addition, if NTL is built as a shared library, then |
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| 522 | you typically do not have to include <tt>-lgmp</tt> (if using GMP), |
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| 523 | or <tt>-lgf2x</tt> (if using <tt>gf2x</tt>), or corresponding |
|---|
| 524 | <tt>-L</tt> flags, or <tt>-lm</tt> |
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| 525 | on |
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| 526 | the command line when compiling programs that use NTL. |
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| 527 | |
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| 528 | |
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| 529 | <p> |
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| 530 | <h2> |
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| 531 | <a name="abi"> |
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| 532 | 32-bit and 64-bit ABIs |
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| 533 | </a> |
|---|
| 534 | </h2> |
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| 535 | <p> |
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| 536 | |
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| 537 | |
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| 538 | An ABI (Application Binary Interface) defines the sizes of various |
|---|
| 539 | <tt>C</tt> data types. |
|---|
| 540 | Typically, with a 32-bit ABI, int's and long's are 32 bits, |
|---|
| 541 | while on a 64-bit ABI, int's are 32 bits and long's are 64 bits. |
|---|
| 542 | Some platforms |
|---|
| 543 | support both 64-bit and 32-bit ABI's; |
|---|
| 544 | typically in such settings, the 64-bit ABI will yield much better |
|---|
| 545 | performance, while the 32-bit ABI is available for backward compatibility. |
|---|
| 546 | In addition, the 64-bit ABI may <i>not</i> be the default: |
|---|
| 547 | if you are using <tt>gcc</tt>, you need to pass the <tt>-m64</tt> |
|---|
| 548 | flag to the compiler to get the 64-bit ABI. |
|---|
| 549 | |
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| 550 | <p> |
|---|
| 551 | When compiling NTL, you may want to try running <tt>configure</tt> |
|---|
| 552 | with <tt>CFLAGS="-O2 -m64"</tt> to force a 64-bit ABI -- this |
|---|
| 553 | may yield a very marked performance improvement. |
|---|
| 554 | |
|---|
| 555 | <p> |
|---|
| 556 | If you are using NTL with either the GMP or <tt>gf2x</tt> libraries, |
|---|
| 557 | then these must be built with the same ABI as NTL. |
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| 558 | The installation script for GMP will typically select the 64-bit ABI |
|---|
| 559 | automatically if it is available. |
|---|
| 560 | The installation script for <tt>gf2x</tt> may need some hints. |
|---|
| 561 | |
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| 562 | <p> |
|---|
| 563 | When compiling programs that use NTL, you must also ensure that |
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| 564 | the program is compiled with the same ABI as NTL. |
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| 565 | Again, if you want a 64-bit ABI, then just pass the flag <tt>-m64</tt> |
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| 566 | to the compiler. |
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| 567 | |
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| 568 | |
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| 569 | |
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| 570 | |
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| 571 | |
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| 572 | <p> <p> |
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| 573 | <p> <p> |
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| 574 | |
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| 575 | <center> |
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| 576 | <a href="tour-stdcxx.html"><img src="arrow1.gif" alt="[Previous]" align=bottom></a> |
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| 577 | <a href="tour.html"><img src="arrow2.gif" alt="[Up]" align=bottom></a> |
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| 578 | <a href="tour-win.html"> <img src="arrow3.gif" alt="[Next]" align=bottom></a> |
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| 579 | </center> |
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| 580 | |
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| 581 | </body> |
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| 582 | </html> |
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