File: Platforms.txt

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imagemagick 6:6.0.6.2-2.9
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This file provides platform specific portability notes which don't
belong in README.txt. Usually ImageMagick compiles fine according to the
procedures described in README.txt, but sometimes a platform related
oddity causes a failure.

Cygwin
======
                                                                                
  Problem
                                                                                
    PerlMagick fails to link.
                                                                                
  Indications
                                                                                
    libperl.a is not found.
                                                                                
  Solution
                                                                                
    Configure like
                                                                                
      ./configure --enable-shared
                                                                                
    or
                                                                                
      ./configure --enable-shared --with-modules
                                                                                
  Cygwin doesn't normally come with a libperl.a but it does come with the
  equivalent DLL.  Using a shared build gets PerlMagick over the hurdle.


SGI Irix
=========

  Problem

    How to successfully configure ImageMagick using SGI's commercial
    compiler (e.g. IRIX C/C++ v7.3.1.X)?

  Indications

    Compiling C++ code fails with the error:
    #error directive:  This header file requires the -LANG:std option

  Solution

    Configure like

      CC=cc CFLAGS="-O2 -OPT:Olimit=0" CXX=CC \
      CXXFLAGS="-LANG:std -Wl,-woff,84 -O2" CXXCPP="CC -LANG:std -E" \
      ./configure --with-modules --with-threads ...

    with the following in /etc/compiler.defaults

      -DEFAULT:abi=n32:isa=mips3


Linux 6.1
=========

  Problem

    When '-rpath /somedir' is added to LDFLAGS in order to tell the
    linker to apply a run-time linker path, configure fails.

  Indications

    The configure script prints the error message

      checking for executable suffix...
                                  configure: error: cannot compute EXEEXT:

    and the error message

      gcc: unrecognized option `-rpath'

    is written to config.log

  Solution

    Use 'LDFLAGS=-Wl,-rpath,/somedir' instead to pass the options through
    to the linker.


FreeBSD 3.X and 4.X
===================

  Problem
  
    ImageMagick does not run after it is installed. The system does not
    see an installed shared library until the 'ldconfig' command has
    been executed (as root) using the correct options.

  Indications
  
    System fails to find shared library needed by ImageMagick.

  Solution
  
    Either reboot the system (which automatically runs ldconfig) or
    execute

      /sbin/ldconfig -m ${PREFIX}/lib

    where ${PREFIX} is the prefix used when configuring ImageMagick
    (default /usr/local).


Digital Unix and OSF/1
======================

  Problem
  
    Digital Unix provides an outdated JPEG shared library as part of the
    system.
    
  Indications

    ImageMagick fails to link.

  Solution
  
    Ensure that the JPEG library you installed is used. Be sure to
    install the JPEG library as a shared library.


Solaris 2.X
============

  Problem
  
    An outdated delegate library is used rather than the one just
    installed.
    
  Indications
  
    o Failure to link due to unresolved symbols
    o Failure to run properly
    o The command 'ldd `which convert`' lists the wrong library.
  
  Solution

    If the problem library is a shared library (.so extension) then
    install your own library as a shared library. Then add the required
    -L and -R options to find your shared library at both link and run
    time. For example, if your library is is installed in /usr/local/lib:
      
      configure LDFLAGS='-L/usr/local/lib -R/usr/local/lib' 

  Problem

    An outdated libtiff.so (libtiff.so.3) is installed in
    /usr/openwin/lib. This library may be used by accident rather than
    the intended libtiff.so, or libtiff.a. In particular, the linker
    generally considers linking against a shared library before it
    considers static libraries, so the system libtiff.so may be used
    even though there is an installed libtiff.a earlier in the linker
    search path.

  Indications
  
    ImageMagick fails to link or load TIFF files.

  Solution

    o Install libtiff as a shared library, and make sure that LDFLAGS
      contains the required -L and -R options to find your shared
      library at both link and run time. For example, if libtiff.so is
      installed in /usr/local/lib:
      
      configure LDFLAGS='-L/usr/local/lib -R/usr/local/lib'

    or
      
    o Remove /usr/openwin/lib/libtiff.so.3. Note that if you take this
      step, some tools like 'imagetool' and 'pageview' will stop working.

  Problem
  
    When using gcc 3.0.X, configure decides that the compiler is insufficient
    to compile Magick++.
    
  Indications
  
    Fails ISO C++ test.
  
  Solution

    The problem is due to gcc provided headers undefining
    Solaris-provided defines for 64-bit versions of stdio functions. The
    solution is to either configure with --disable-largefile or edit the
    installed g++-v3/bits/std_cstdio.h to bracket the offending undefs
    (for fgetpos, fopen, freopen, fsetpos, & tmpfile) like:

    #if _FILE_OFFSET_BITS != 64
    #undef fopen
    #endif

       or

    Install gcc 3.1 (or later) instead.

  Problem

    A static library was used in a shared library build.

  Indications

    Linker prints a warning similar to:

    "ld: fatal: relocations remain against allocatable but non-writable
     sections"

  Solution

    All libraries used in a shared library build *must* also be shared
    libraries. Check all libraries referenced in the libtool link
    command line and verify that all of the referenced libraries are
    indeed shared libraries. All system libraries are available as
    shared libraries so it is likely that any static library is locally
    installed.