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List:       r-sig-mac
Subject:    Re: [R-SIG-Mac] any advice on libtiff? (and rtiff)
From:       Simon Urbanek <simon.urbanek () r-project ! org>
Date:       2010-04-29 16:19:38
Message-ID: 6B93A028-369F-48A3-9570-4D3604D4BBE5 () r-project ! org
[Download RAW message or body]

On Apr 28, 2010, at 6:25 PM, Carl Witthoft wrote:

> Hi, I know rtiff does not compile 'cause it can't find libtiff (per cran check \
> logs). 

Unfortunately rtiff forces wrong flags (that it checks with the wrong compilers and \
flags) and it allows no way around it so the best way forward would be if Eric could \
address this (details below).

The correct flags for the static build are PKG_LIBS="-ltiff -ljpeg -lz" because \
libtiff relies on JPEG and libz, but rtiff does not allow that.

I'm CCing Eric in the hope that this can be addressed in the package:

First, configure will check with CPPFLAGS, CFLAGS, LIBS etc. yet those all are \
ignored since there is PKG_LIBS="-ltiff"
which is wrong - that's not what configure actually checked at all. AC_CHECK_LIB \
modifies LIBS to reflect the correct flags so it should be at the very least \
PKG_LIBS="$LIBS"

Second, the R compiler settings are ignored so the checks are actually run with the \
wrong compiler (this is crucial because let's say if you compile for R_ARCH=/x86_64 \
then the checks will be run with the default architecture of the compiler such as \
i386 which is completely different).

Also to make it more R friendly it is a good idea to initialize LIBS="$PKG_LIBS" so \
that the commonly used PKG_LIBS are respected (this is optional). So the configure.in \
could look something like

AC_PREREQ(2.1)
AC_INIT([rtiff], [1.1], [eric.kort@vai.org])
AC_CONFIG_SRCDIR([src/rtiff.c])

> ${R_HOME=`R RHOME`}
if test -z "${R_HOME}"; then
  echo "could not determine R_HOME"
  exit 1
fi
RBIN="${R_HOME}/bin/R"
CC=`"${RBIN}" CMD config CC`;
CFLAGS=`"${RBIN}" CMD config CFLAGS`
LIBS="${PKG_LIBS}"

# Checks for programs.
AC_PROG_CC

# Checks for libtiff.
AC_CHECK_LIB([tiff], [TIFFOpen], [], [
                echo Error: Could not find libtiff.
                exit -1
                ])

PKG_LIBS="$LIBS"

AC_SUBST(PKG_LIBS)
AC_OUTPUT([src/Makevars])


Thanks,
Simon


> I'm just wondering if anyone has successfully installed libtiff, either from source \
> or via MacPorts?  And if so,  is it then possible to build rtiff from the source \
> and have everything work? 
> So far I've (naively) tried building libtiff3.9.2 from sources, but even though \
> "make" seems to happily complete its job,  nothing seems to be installed anywhere \
> useful. 
> Or should I just bite the bullet and install the Gtk tiff tools and that big \
> graphics package (something-BE, I forget the name just now)? 
> 
> thanks
> Carl
> 
> _______________________________________________
> R-SIG-Mac mailing list
> R-SIG-Mac@stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
> 
> 

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