Copyright 1999-2017 Free Software Foundation, Inc.

Contributed by the AriC and Caramba projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR Library is free software; you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation; either version 3 of the License, or (at your

option) any later version.

The GNU MPFR Library is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

License for more details.

You should have received a copy of the GNU Lesser General Public License

along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see

http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,

51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

                        Installing GNU 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.gnu.org/software/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 and if patches are available. You can check

   on the release page:

     http://www.mpfr.org/mpfr-3.1.6/

   which may have additional information. The patches can be applied

   with commands like:

     wget http://www.mpfr.org/mpfr-3.1.6/allpatches

     patch -N -Z -p1 < allpatches

   or

     curl http://www.mpfr.org/mpfr-3.1.6/allpatches | patch -N -Z -p1

   (Those instructions are for the GNU patch command, for example

   /usr/bin/gpatch on Solaris.)

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). You should also check whether WARNING

   lines have been output (such a problem may cause a failure in one

   of the following steps).

   Note: paths provided in configure options must always be absolute

   (relative paths are not supported).

4. To build the library, type:

     make

   [optional] if you want to tune MPFR for your specific architecture, see

   the section "Tuning MPFR" below. Note that for most common architectures,

   MPFR includes some default tuning parameters which should be near from

   optimal.

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

     make check

   Note: If any test fails, information about this failure can be found in

   the tests/test-suite.log file; you should provide this file in your bug

   reports (in addition to other useful information, as mentioned later).

   If you want the contents of this file to be automatically output in case

   of failure, you can set the VERBOSE environment variable to 1 before

   running "make check", for instance by typing:

     VERBOSE=1 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 pdf" to produce the documentation in the PDF format.

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

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

* Type "make html" to produce the documentation in the HTML format

  (in several pages); if you want only one output HTML file, then

  type "makeinfo --html --no-split mpfr.texi" from the doc directory

  instead.

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, which

may be located either in the GMP source directory or in the GMP build

directory, in case they are different (MPFR takes care of that, as of

MPFR 3.1.0).

Warning: the library obtained in this way may use some internal GMP

symbols, and thus dynamically linking your software with a different

version of GMP might fail, even though it is declared as compatible

by Libtool's versioning system.

Tuning MPFR

===========

For this, you need to build MPFR with a GMP build directory (see above).

In the GMP build directory, you also need to go into the "tune" subdirectory

and type "make speed". This will build the GMP speed library, which is used

by the MPFR tuning mechanism.

Then go back to the MPFR build directory, go into the "tune" subdirectory and

type "make tune". This will build an optimized file "mparam.h" for your

specific architecture.

./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

--with-gmp-lib=DIR      assumes that DIR contains the GMP library

--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

                        (use either --with-gmp alone or one or both of

                        --with-gmp-lib/--with-gmp-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

                        (typically /usr or /usr/local); see below.

--with-gmp-build=DIR    assumes that DIR contains the GMP build directory,

                        and enables the use of GMP internals (see above).

                        Warning! This option and the group of options

                        --with-gmp are mutually exclusive.

--enable-assert         build MPFR with assertions.

--enable-thread-safe    build MPFR as thread safe, using compiler-level

                        Thread Local Storage (TLS). Note: TLS support is

                        roughly tested by configure. If configure detects

                        that TLS does not work (because of the compiler,

                        linker or system libraries), it will output an

                        error message, telling you to build MPFR without

                        thread safe. For instance, though Mac OS X uses

                        GCC, it may not currently support GCC's __thread

                        storage class.

--disable-thread-safe   build MPFR without TLS. By default, TLS support

                        is detected automatically, and MPFR is built as

                        thread safe if supported. However this detection

                        is only a heuristic: TLS can be detected as

                        supported while its support is incomplete or

                        buggy (MPFR tests may fail). In such a case,

                        this option is useful.

--enable-gmp-internals  allows the MPFR build to use GMP's undocumented

                        functions (not from the public API). Note that

                        library versioning is not guaranteed to work if

                        this option is used. Thus it must not be used in

                        binary distributions.

Note: By default, the configure script tries to set CC/CFLAGS to GMP's

ones (this feature needs GMP 4.3.0 or later, or the --with-gmp-build

option). However this is not guaranteed to work as the configure script

does some compiler tests earlier, and the change may be too late. Also,

the values obtained from GMP may be incorrect if GMP has been built

on a different machine. In such a case, the user may need to specify

CC/CFLAGS as explained below.

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

If 'gmp.h' and 'libgmp' do not match

====================================

Under some circumstances, the configure script may output a message

saying:

  'gmp.h' and 'libgmp' seem to have different versions or

  we cannot run a program linked with GMP (if you cannot

  see the version numbers above). [...]

Even though the configure script does not fail in such a case, this

message most often indicates a real error, which needs to be avoided.

Possible causes are:

* The wanted GMP library does not have the same ABI as the one chosen

  to build MPFR. The consequences may be:

    - A different GMP library (with the correct ABI) has been found,

      but does not have the same version as 'gmp.h'.

    - No other GMP libraries have been found (in this case, no version

      numbers should be printed above the warning message).

  This is incorrect and one of the following steps (make, make check)

  will probably fail. GMP (actually gmp.h) now provides CC and CFLAGS

  information to select the correct ABI, so that this problem should

  no longer occur; but if GMP was provided by a binary package, such

  information may not be valid. See the

    checking for CC and CFLAGS in gmp.h...

  line in the configure output (about the 11th line) and the following

  few ones for more information. You may need to reinstall GMP or to

  provide your own CC and/or CFLAGS. See also the remaining of this

  INSTALL file.

* A configure option like --with-gmp or --with-gmp-include was used

  with a system include directory, e.g. one of the following:

    --with-gmp=/usr

    --with-gmp=/usr/local

    --with-gmp-include=/usr/include

    --with-gmp-include=/usr/local/include

  GCC (and possibly other compilers) will ignore such a directive for

  include directories (but this rule is not applied for the library

  itself!). This means that the library search paths will be reordered

  as declared, but the specified include directory will still be near

  the end of the include search paths (thus with a low precedence).

  This is not a problem if only one GMP version is installed, but

  otherwise, a wrong gmp.h may be chosen, so that the versions of

  gmp.h and libgmp may not match. The suggestions are the following:

    - If you want to use the GMP version under /usr, then you should

      uninstall all the other GMP versions (header and library files)

      that may be seen in the search paths, in particular those under

      /usr/local.

    - If you want to use the GMP version under /usr/local, then you

      should uninstall all the other GMP versions (header and library

      files) that may be seen in the search paths, but *NOT* the one

      under /usr (the version under /usr is provided by the OS vendor,

      and changing/removing anything related to it may break your

      system, and /usr should have a lower precedence than /usr/local

      anyway).

  To find where GMP versions have been installed:

    $ locate libgmp  (if you have a locate database)

  and if the compiler is GCC:

    $ gcc -print-file-name=libgmp.so     (under most systems)

    $ gcc -print-file-name=libgmp.dylib  (under Mac OS X)

  and if this does not work, you may try:

    $ gcc -print-search-dirs

* An official GCC version was used under Debian GNU/Linux. Problems

  may come from the fact that Debian chose a different convention

  for library search paths concerning 32-bit and 64-bit libraries.

  A possible problem can be, for instance:

  [Debian's GCC, correct library path]

  $ gcc -print-file-name=libgmp.so

  /home/vlefevre/gmp/athlon64/lib/../lib/libgmp.so

  [Official GCC, incorrect library path]

  $ gcc-4.3.1 -print-file-name=libgmp.so

  /usr/lib/../lib64/libgmp.so

  The solution: use a GCC provided by Debian or add symbolic links

  such as lib64 -> lib (on 64-bit machines) for your library paths.

* The problem may also be temporary and only due to the fact that

  libtool could not be used at this time. This is unlikely, though.

In case of problem

==================

First, look for any warning message in the configure output.

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-3.1.6/>,

    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>"

(quotes are needed when there are spaces or other special characters

in the CC/CFLAGS value) 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.

Warning! Do NOT use optimization options that can change the semantics

of math operations, such as GCC's -ffast-math or Sun CC's -fast.

Otherwise conversions from/to double's may be incorrect on infinities,

NaN's and signed zeros. Since native FP arithmetic is used in a few

places only, such options would not make MPFR faster anyway.

If some "make check" tests fail, you can try the --disable-thread-safe

configure option (see the configure options above): it has been reported

that some platforms have buggy TLS support. Before trying this option,

you may want to check in the configure output whether MPFR was built

with TLS support; if yes, you will have a line:

  checking for TLS support... yes

Alternatively "grep MPFR_USE_THREAD_SAFE config.log" will show that

MPFR_USE_THREAD_SAFE is defined to 1. If it is "no" (or the variable

is not defined), the --disable-thread-safe option would be useless.

Some tests failure may be due to other compiler bugs, in particular

in optimization code. You can try to build MPFR without compiler

optimizations by giving -O0 (letter O, digit 0) in CFLAGS. If the

MPFR tests no longer fail, this was probably due to a compiler bug,

though we cannot exclude a bug in MPFR. You may want to contact us

(see below), possibly after looking at:

  http://www.loria.fr/~zimmerma/software/compilerbugs.html

On some platforms, try with "gmake" (GNU make) instead of "make".

Problems have been reported with the Tru64 make.

If the configure script reports that gmp.h version and libgmp version

are different, or 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 some GNU/Linux machines, where the

default header and library search paths may be inconsistent: GCC is

configured to search /usr/local/include and /usr/local/lib by default,

while the dynamic linker ignores /usr/local/lib. If you have a GMP

version installed in /usr (provided by the OS vendor) 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! The best solution

is to make sure that the dynamic linker configuration is consistent

with GCC's behavior, for instance by having /usr/local/lib in

/etc/ld.so.conf or in some file from /etc/ld.so.conf.d (as Debian

did: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=395177). See

also https://gcc.gnu.org/ml/gcc-help/2010-01/msg00171.html for more

information. Alternatively you can use:

  * environment variables. This may sometimes be necessary. If DIR

    is the installation directory of GMP, add DIR/include to your

    CPATH or C_INCLUDE_PATH (for compilers other than GCC, please

    check the manual of your compiler), and add DIR/lib to your

    LIBRARY_PATH and LD_LIBRARY_PATH (and/or LD_RUN_PATH);

  * --with-gmp* configure options (described above), e.g.

    --with-gmp=/opt/local (to use /opt/local/include for headers and

    /opt/local/lib for libraries), but other software that uses GMP

    and/or MPFR will need correct paths too, and environment variables

    allow one to set such search paths in a global way.

    Note about "--with-gmp=/usr/local". This option may appear to

    solve the above inconsistency problem, but does not work as you

    expect. Indeed it affects the library search path, in particular,

    the one used by the dynamic linker (thus adding the missing

    /usr/local/lib directory as wanted), but since /usr/local/include

    is a "standard system include directory" for GCC, the include

    search patch is not changed; this is often not a problem in this

    particular case because usually, /usr/local/include is already

    last in the include search patch, but this may fail under some

    occasions and may trigger obscure errors.

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 via the MPFR

mailing-list <mpfr@inria.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, in particular the tests/test-suite.log file if

"make check" failed. 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 about ABI

===============

On 64-bit computers, it may happen that the default ABI (Application Binary

Interface) chosen by MPFR does not correspond to the default one chosen by

the compiler.

In particular, this kind of message may indicate the problem:

/usr/bin/ld: skipping incompatible mpfr/src/.libs/libmpfr.a when searching for -lmpfr

In fact, since MPFR relies on GMP, it uses the same ABI as GMP.

To be sure that your program compiles and links correctly, use the same

compiler flags as MPFR does (look for CFLAGS in config.log).

You might also recompile GMP with a different ABI, with for example

./configure ABI=32.

Notes on Mac OS X

=================

If you get an error of the form

  ld: pointer in read-only segment not allowed in slidable image...

this can mean that the link is done against a static (GMP) library.

In such a case, you should configure MPFR with --disable-shared to

disable the build of the shared library.

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 7.1.3 (gcc111.fsffrance.org)

with gcc 4.8.1 and GMP 6.1.0.

If GMP was built with the 64-bit ABI, before building and testing MPFR,

you should set the OBJECT_MODE environment variable to 64, e.g., with:

  export OBJECT_MODE=64

(in a sh-compatible shell). Alternatively add the following to the configure

line: AR="ar -X64" NM="nm -B -X64".

MPFR for use with Windows Applications

======================================

There are several ways of building MPFR on Windows, the most appropriate

approach depending on how you intend to use the resulting libraries.

a. Using MinGW

==============

1 - We advise to use MinGW (http://www.mingw.org/ for 32-bit, and

    https://sourceforge.net/projects/mingw-w64/ for 32- and 64-bit),

    which is simpler and less demanding than Cygwin. Contrary to Cygwin,

    it also provides native Windows code.

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 - To avoid using the Microsoft runtime (which might not be conform to ISO C),

    you can use the MinGW runtime package (which is an integral part of MinGW).

    For example, with MinGW versions 3.15 and later you can get an

    ISO-compliant printf() if you compile your application with either

    '-ansi', '-posix' or '-D__USE_MINGW_ANSI_STDIO'. In order to have the

    MPFR formatted output functions based on ISO-compliant printf(), you

    need to compile GMP (not MPFR) with CC="gcc -D__USE_MINGW_ANSI_STDIO"

    (since the standard printf modifiers %Ld and %td are passed to GMP).

    Building MPFR with -D__USE_MINGW_ANSI_STDIO is useless except for some

    error messages in the test suite.

b. Using Cygwin

===============

This build should be similar to that for MinGW except that the resulting

library depends on the Cygwin DLL and cannot therefore be used with

Visual Studio as with MinGW. Indeed, 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.

In case of failure, you may need to pass LDFLAGS='-shared-libgcc' at the

end of the configure line due to a bug in GCC. Otherwise, if threading

support is not needed, you can configure MPFR with --disable-thread-safe.

c. Using Microsoft Visual C++ and Intel C++ Compilers

=====================================================

Static and dynamic MPFR libraries for the 32- and 64-bit versions of

Windows can be built with Microsoft Visual Studio 2015 using the

Microsoft Visual C++ compiler, see:

  https://www.visualstudio.com/

The Intel C++ compiler provided as a part of Intel Parallel Studio XE

can also be used:

  https://software.intel.com/en-us/intel-parallel-studio-xe

The relevant build projects are available here:

  https://github.com/BrianGladman