                        Installing MPFR
                        ===============

Note: In case of problem, please read this INSTALL file carefully before
reporting a bug, in particular Section "In case of problem" below. Some
problems are due to bad configuration on the user side (not specific to
MPFR).

0. You first need to install GMP. See <http://www.swox.com/gmp/>.
   MPFR requires GMP version 4.1 or later.

1. Extract the files from the archive.

2. It is strongly advised to apply the latest patches (if this has
   not been done yet), e.g.
     wget http://www.mpfr.org/mpfr-2.3.1/patches
     patch -N -Z -p1 < patches
   or
     curl http://www.mpfr.org/mpfr-2.3.1/patches | patch -N -Z -p1

3. In the MPFR directory, to detect your system, type:
     ./configure
   possibly with options (see below, in particular if this step or
   one of the following fails).
   Note: paths provided in configure options must always be absolute
   (relative paths are not supported).

4. To build the library, type:
     make

5. To check the built library (runs the test files), type:
     make check

6. To install it (default "/usr/local" | see "--prefix" option), type:
     make install

If you installed MPFR (header and library) in directories that are
not searched by default by the compiler and/or linking tools, then,
like with other libraries, you may need to set up some environment
variables such as C_INCLUDE_PATH (to find the header mpfr.h),
LIBRARY_PATH (to find the library), and if the shared library has
been installed, LD_LIBRARY_PATH (before execution) or LD_RUN_PATH
(before linking); this list is not exhaustive and some environment
variables may be specific to your system. "make install" gives some
instructions; please read them. You can also find more information
in the manuals of your compiler and linker. The MPFR FAQ may also
give some information.

Remember that if you have several MPFR (or GMP) versions installed
(e.g., one with the system, and one, newer, by you), you will not
necessarily get a compilation/linking error if a wrong library is
used (e.g., because LD_LIBRARY_PATH has not been set correctly).
But unexpected results may occur.

Under Mac OS X, if the shared library was not installed and you use
Apple's linker (this is the default), you will also need to provide
the -search_paths_first linker flag ("-Wl,-search_paths_first" when
you link via gcc) to make sure that the right library is selected,
as by default, Apple's linker selects a shared library preferably,
even when it is farther in the library paths. We recall that if a
wrong library is selected due to this behavior, unexpected results
may occur.


Building the documentation
==========================

To build the documentation in various formats, you may first need to
install recent versions of some utilities such as texinfo.

* Type "make info" to produce the documentation in the info format.

* Type "make dvi" to produce the documentation in the DVI format.

* Type "make mpfr.ps" to produce the documentation in the Postscript format.


Building MPFR with internal GMP header files
============================================

MPFR built with internal GMP header files is a bit faster, so you may want
to build it with them. Just do this in step 1:

  ./configure --with-gmp-build=GMPBUILD

where GMPBUILD is the GMP build directory. The needed header files are:
gmp-impl.h, longlong.h and all the necessary headers to use them.


./configure options
===================

--prefix=DIR            installs MPFR headers and library in DIR/include and
                        DIR/lib respectively (the default is "/usr/local").

--with-gmp-include=DIR  assumes that DIR contains gmp.h [, gmp-impl.h, ...]
--with-gmp-lib=DIR      assumes that DIR contains libgmp.a
--with-gmp-build=DIR    assumes that DIR contains the source of GMP.
                        same as --with-gmp-lib=DIR/.libs
                        and     --with-gmp-include=DIR
                        Try to set CC/CFLAGS to GMP's ones. This is not
                        guaranteed to work as the configure script does
                        some compiler tests earlier, and the change may
                        be too late.
--with-gmp=DIR          assumes that DIR is where you have installed GMP.
                        same as --with-gmp-lib=DIR/lib
                        and     --with-gmp-include=DIR/include
                        Warning! Do not use these options if you have
                        CPPFLAGS and/or LDFLAGS containing a -I or -L
                        option with a directory that contains a GMP
                        header or library file, as these options just
                        add -I and -L options to CPPFLAGS and LDFLAGS
                        *after* the ones that are currently declared,
                        so that DIR will have a lower precedence. Also,
                        this may not work if DIR is a system directory.

--enable-assert         build MPFR with assertions.
--enable-thread-safe    build MPFR as thread safe.

Run "./configure --help" to see the other options (autoconf default options).


In case of problem
==================

Several documents may help you to solve the problem:
  * this INSTALL file, in particular information given below;
  * the FAQ (either the FAQ.html file distributed with MPFR, or the
    on-line version <http://www.mpfr.org/faq.html>, which may be more
    up-to-date);
  * the MPFR web page for this version <http://www.mpfr.org/mpfr-2.3.1/>,
    which lists bugs found in this version and provides some patches.

If the "configure" fails, please check that the C compiler and its
options are the same as those for the GMP build (specially the ABI).
You can see the latter with the following command:

  grep "^CC\|^CFLAGS" GMPBUILD/Makefile

if the GMP build directory is available. Then type:

  ./configure <configure options> CC=<C compiler> CFLAGS=<compiler options>

and continue the install. On some platforms, you should provide further
options to match those used by GMP, or set some environment variables.
For instance, see the "Notes on AIX/PowerPC" section below.

On some platforms, try with "gmake" (GNU make) instead of "make".
Problems have been reported with the Tru64 make.

If the build was OK, but the tests failed to link with GMP or gave an
error like

  undefined reference to `__gmp_get_memory_functions'

meaning that the GMP library was not found or a wrong GMP library was
selected by the linker, then your library search paths are probably
not correctly set (some paths are missing or they are specified in an
incorrect order).

Such problems commonly occur under GNU/Linux machines, where default
header and library paths may be inconsistent: gcc is configured to
search /usr/local/include by default, while /usr/local/lib is not in
the default search paths. If you have a GMP version installed in /usr
(provided by the OS) and a new one installed in /usr/local, then the
header of the new GMP version and the library of the old GMP version
will be used! A typical error is the above one in "make check". The
solution is to add /usr/local/include to your C_INCLUDE_PATH and to
add /usr/local/lib to your LIBRARY_PATH and LD_LIBRARY_PATH (and/or
LD_RUN_PATH), as said above. Alternatively, you can use --with-gmp*
configure options (described above), e.g. --with-gmp=/usr/local, but
other software that uses GMP and/or MPFR will need correct paths too,
and environment variables allow to set them in a global way.

For instance, under Unix, where paths are separated by a colon:

  * With POSIX sh-compatible shells (e.g. sh, ksh, bash, zsh):
    export C_INCLUDE_PATH="/usr/local/include:/other/path/include"
    export LIBRARY_PATH="/usr/local/lib:/other/path/lib"
    export LD_LIBRARY_PATH="$LIBRARY_PATH"

  * With csh or tcsh:
    setenv C_INCLUDE_PATH "/usr/local/include:/other/path/include"
    setenv LIBRARY_PATH "/usr/local/lib:/other/path/lib"
    setenv LD_LIBRARY_PATH "$LIBRARY_PATH"

If you can't solve your problem, you should contact us at <mpfr@loria.fr>,
indicating the machine and operating system used (uname -a), the compiler
and version used (gcc -v if you use gcc), the configure options used if
any (including variables such as CC and CFLAGS), the version of GMP and
MPFR used, and a description of the problem encountered. Please send us
also the log of the "configure" (config.log).

Note that even if you can build MPFR with a C++ compiler, you can't run
the test suite: C and C++ are not the same language! You should use a C
compiler instead.


Notes on FreeBSD 4.3
====================

FreeBSD 4.3 is provided with an incorrect <float.h> header file, and
MPFR tests related to long double's may fail. If you cannot upgrade
the system, you can still use MPFR with FreeBSD 4.3, but you should
not use conversions with the long double type.


Notes on AIX/PowerPC
====================

The following has been tested on AIX 5.3 (powerpc-ibm-aix5.3.0.0) with
gcc 3.3.2 and GMP 4.2.1.

Before building and testing MPFR, you should set the OBJECT_MODE
environment variable to 64 (as GMP selects the 64-bit ABI by default),
e.g. with:

  export OBJECT_MODE=64

(in a sh-compatible shell). But you should also provide a correct CFLAGS
value to the "configure" script: using --with-gmp-build is not sufficient
due to the early compiler tests, as gcc will not compile any program if
OBJECT_MODE is 64 and the -maix64 option is not provided.


Notes on Windows 32
===================

1 - We advise to use mingw (http://www.mingw.org/), which is simpler and
    less demanding than Cygwin. Contrary to Cygwin, it also provides native
    Windows code. The binaries compiled with Cygwin require a dynamic
    library (cygwin.dll) to work; there is a Cygwin option -mno-cygwin to
    build native code, but it may require some non-portable tricks.

2 - If you just want to make a binary with gcc, there is nothing to do:
    GMP, MPFR and the program compile exactly as under Linux.

3 - If you want to make libraries to work under another Windows compiler
    like Visual C / C++, the "trick" is that the unix-like *.a files created
    by gcc are entirely compatible with the Windows *.lib files. So you just
    have to rename the *.a files into *.lib.

    With gmp-4.1.3, the only remaining problem seems to be the "alloca" calls
    in GMP. Configuring GMP and MPFR with --enable-alloca=malloc-reentrant
    should work (if you build MPFR with GMP internal files).

    Or you could add the library
     "$MINGWIN$/lib/gcc-lib/mingw32/$VERSION$/libgcc.a"
    to your project: it contains all the extra-functions needed by a program
    compiled by gcc (division of 64-bit integer, bcopy, alloca...).
    Of course, include it if and only if your compiler is not gcc.

4 - On Windows32 / MinGW, if all the tests fail, try to run the test suite
    with "make check EXEEXT=".


Notes on Windows 64
===================

MPFR has not been tested on Windows 64.
