install

该文件为c++的数学函数库!是一个非常有用的编程工具.它含有各种数学函数,为科学计算、工程应用等程序编写提供方便！

GSL - GNU Scientific Library
============================

Installation Instructions
=========================

GSL follows the standard GNU installation procedure.  To compile GSL
you will need an ANSI C-compiler.  After unpacking the distribution
the Makefiles can be prepared using the configure command,

  ./configure

You can then build the library by typing,

  make

Both static and shared versions of the libraries will be compiled by
default.  Compilation of shared libraries can be turned off by
specifying the `--disable-shared' option to `configure', e.g.
  
  ./configure --disable-shared

If you encounter problems building the library try using the above
option, because some platforms do not support shared libraries.

For notes about problems with specific platforms and compilers see the
next section of this file (below).

An extensive test suite is available.  It can be invoked with "make
check" in each directory.  All tests can be run together with "make
check" at the top level.  The test output should be directed to a file
rather than a terminal, with the command,

   make check > log 2>&1

since it is several megabytes in size.

If you run "make check" and get some failures, please see the notes on
platform specific problems below.  If you find failures that are not
mentioned, please report them.

The library can be installed using the command,

  make install

The default install directory prefix is /usr/local.  Consult the
"Further Information" section below for instructions on installing the
library in another location or changing other default compilation
options.

                    ------------------------------

Platform Specific Compilation Notes
===================================

This section documents any known issues with installing GSL on
specific platforms.

Hints for any platform
======================

1) If there are problems building the library try using

        ./configure --disable-shared

This will turn off the compilation of shared libraries and may allow
the build process to complete successfully.  

If you get any problems try this first.

2) With gcc-2.95/2.96 the tests fail in the eigen/ directory.  This is
due to a compiler optimization bug which causes errors in the
manipulation of complex numbers.  Do not use the library if you
encounter this problem.

This is fixed in more recent versions of gcc.  Compiling without
optimisation will work around the bug.

3) Attempts to run 'strip' on the static library libgsl.a will probably
produce a broken library (it is known to happen with GNU binutils
strip, and probably affects others too). The libgsl.a ar archive made
by libtool contains files with the same filenames from different
directories, and this causes the strip program to overwrite these
archive entries.  If you need to produce a compact version of the
library compile without -g instead of using strip.

make install-strip does not work, due to a minor problem with autoconf
which is fixed in the 2.5 development version of autoconf.  In the
meantime compile without -g instead if you need to reduce the file size.

4) The configure script can fail with a segmentation fault on bash-2.01

    $ ./configure
    Segmentation fault

This is due to a bug in bash, related to the MAIL environment
variable.  To work around it use 

    $ unset ENV MAIL MAILPATH
    $ ./configure

which should avoid the problem.

Hints for AIX
=============

For compilation problems with the native compiler xlc, try disabling
shared libraries,

    setenv CC 'xlc'
    setenv CFLAGS '-O -qmaxmem=8192'
    ./configure --disable-shared
    make

If you get the error,

   ld: 0711-781 ERROR: TOC overflow. 

you can try building the library with a larger linker
table-of-contents by setting LDFLAGS before compilation,

   LDFLAGS="-Wl,-bbigtoc" ./configure


Hints for Compaq/DEC Alpha
==========================

The library should compile successfully with Compaq's C compiler using
the -std and -ieee options.  Use

    CC=cc ./configure    
    make CFLAGS="-std -ieee"

to build the library this way.

Use GNU tar to unpack the tar file, as Tru64 tar gives an error
halfway through.

Hints for DOS
=============

When using DJGPP The default stack size of 512k may be insufficient for
the specfunc tests and will cause them to crash.  To increase the
stack size by a suitable amount use,

  	stubedit test.exe minstack=1536k

on the executable and then rerun it manually.  (5/01: The specfunc
tests have been rewritten to use less stack space now).


Hints for HP-UX
===============

The default mode of the HP-UX C compiler does not use ANSI C.

To compile GSL you need to select ANSI C mode with the following
configuration option:

      CFLAGS="-Ae"  ./configure

To switch on optimization use CFLAGS="-Ae -O".


Hints for Intel (Pentium)
========================

For the Pentium 4 with GCC-3.2 the flags,

      CFLAGS="-O2 -march=pentium4 -mfpmath=sse -msse -msse2"

increase performance (as reported by Sam Halliday <[e-mail]>).

Note that P3 machines can also use the above CFLAGS, if the "-msse2"
is removed and "pentium4" is changed to "pentium3".

Hints for IRIX (SGI)
====================

The library should be compiled with the CFLAGS option
-OPT:IEEE_NaN_inf=ON to ensure correct IEEE arithmetic.  The tests in
sys/ will fail without this option.  The older deprecated option
-OPT:IEEE_comparisons=ON will also work.

The 32 bit IRIX compiler gives warnings about "long double" not being
supported. These can be ignored or turned off with,

   CFLAGS="-woff 728" ./configure

or 

   make CFLAGS="-woff 728"

The compiler also gives warnings about certain libraries that are "not
used for resolving any symbol". This is harmless and the warnings can
be ignored.

You may get warnings about " /usr/bin/ld: arg list too long" when
building shared libraries.  If so, try increasing the ncargs kernel
parameter with the systune(1m) command.

For 64-bit compilation use the following options,

  CC=cc CFLAGS="-64" LDFLAGS="-64" ./configure

or for gcc

  CFLAGS="-mabi-64" LDFLAGS="-mabi=64 -mips4 -L/usr/local/lib/mabi=64"

Hints for MacOS X
=================

Note that GSL contains files with filenames of 32 characters or more.
Therefore you need to be careful in unpacking the tar file, as some
MacOS applications such as Stuffit Expander will truncate filenames to
31 characters.  Using GNU tar and gunzip directly is the safe way to
unpack the distribution.

There are problems with dynamic linker, so the library should be
compiled with,

  ./configure --disable-shared

To build shared libraries you can install MacOS X versions of libtool,
automake and autoconf, and then reconfigure:

  1. Get the fink packaging tool (http://fink.sourceforge.net)
  2, Install fink's libtool14, automake, autoconf25.
  3. Regenerate GSL's configuration using ./autogen.sh in the 
     top-level directory.
  4. ./configure, make