##								-*-text-*-
##
## HowTo install the OFFIS DICOM toolkit dcmtk350 in our IRIX environment
##
# $Id: HowTo-Install-dcmtk350.txt,v 1.2 2001/06/14 10:02:39 meyer Exp $
# $Source: /people/staff2/meyer/.cvsroot/public_html/dcmtk/HowTo-Install-dcmtk350.txt,v $


This text describes how I compiled dcmtk-350rc1 on a SGI Onyx2 running
IRIX 6.5.6m using gcc/g++ 2.95.2.

The crucial step is to remove -lsocket and -lnsl from the list of linked
libraries, and to remove /usr/lib from the linkpath. These are known
flaws of autoconf/configure, as stated in
http://toolbox.sgi.com/TasteOfDT/public/freeware/shared/howto.html

Compiling in OpenSSL support rises another problem, that can be solved
by careful selection of compiler options, as stated below. 


* Configure:

  - By default, configure grabs gcc, c++ and libtool as compiler and
    archiver. This can be overridden by setting CC, CXX and AR: 

15:23 meyer@forte:~mtdyna/related_software/dcmtk350_rc1> ./configure --prefix=/usr/local/dcmtk350 --with-openssl --with-opensslinc=/usr/local/ssl
Running configure for module config.
creating cache ./config.cache
checking whether make sets ${MAKE}... yes
[...]
updating cache ./config.cache
creating ./config.status
creating ./apps/Makefile
creating ./docs/Makefile
creating ./Makefile
creating ./include/Makefile
creating ./tests/Makefile
creating ./wwwapps/Makefile
creating ./libsrc/Makefile


  * Two problems occur, both well known flaws of autoconf: 
    - configure wants to link with -lsocket, -lnsl. They are not
      needed under IRIX 6.x. 
    - configure adds "-L /usr/lib" to the linker flags, which is wrong if
      /usr/lib32 is present. (One should leave this to the linker himself )-:

    To fix this: 
      - cd conf 
      - edit config.status
	- remove -lsocket
	- remove -lnsl
	- remove -L /usr/lib
      - rerun config.status (./config.status) 
      - cd .. 
      - for reference, here is a diff: 
15:32 meyer@onyx2:~mtdyna/related_software/dcmtk342-rc1/config> diff config.status*
45c45
< s%@LIBS@%-lrt -lpthread %g
---
> s%@LIBS@%-lrt -lpthread -lsocket -lnsl %g
77c77
< s%@X_LIBS@%%g
---
> s%@X_LIBS@% -L/usr/lib%g

    See http://toolbox.sgi.com/TasteOfDT/public/freeware/shared/howto.html
    for mor info. 

  * Another problem occurs when compiling in OpenSSL support, only. This
    needs tweeking with compilerflags. Defining so many macros confuses
    IRIX, so I tried a minimalistic approach and succeeded with only 4
    macros.

    You have to modify CXXFLAGS in config/config.status like that: 

# s%@CXXFLAGS@%-O -I/usr/local/ssl/include -D_REENTRANT -D_XOPEN_SOURCE_EXTENDED -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -D_BSD_COMPAT -D_OSF_SOURCE -D_POSIX_C_SOURCE=199506L -Wall %g
s%@CXXFLAGS@%-O -I/usr/local/ssl/include -D_REENTRANT -D_XOPEN_SOURCE_EXTENDED -D_BSD_SOURCE -D_BSD_COMPAT -Wall %g

    Then rerun config.status (cd config; ./config.status; cd ..) and remake. 
    

* Make:

  - pmake, smake and make fail (with different problems, Makefiles not
    thread-safe)    -> use GNUmake

* Don't forget: Kaum macht man's richtig, schon gehts. 


# APPENDIX: 
  Compile error with OpenSSL and default CXXFLAGS: 

Failure compiling dulfsm.cc
[....]
c++     -DHAVE_CONFIG_H  -DNDEBUG  -c -I. -I. -I../include -I../../config/include -I../../ofstd/include -I../../dcmdata/include -I/usr/local/dcmtk350/include/ofstd -I/usr/local/dcmtk350/include/dcmdata  \
         -O -I/usr/local/ssl/include -D_REENTRANT -D_XOPEN_SOURCE_EXTENDED -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -D_BSD_COMPAT -D_OSF_SOURCE -D_POSIX_C_SOURCE=199506L -Wall  dulfsm.cc 
In file included from dulfsm.cc:92:
/usr/include/netinet/tcp.h:52: declaration of `u_char tcphdr::th_off'
/usr/include/netinet/tcp.h:49: conflicts with previous declaration `u_char tcphdr::th_off'
/usr/include/netinet/tcp.h:53: declaration of `u_char tcphdr::th_x2'
/usr/include/netinet/tcp.h:48: conflicts with previous declaration `u_char tcphdr::th_x2'
/usr/include/netinet/tcp.h:53: duplicate member `tcphdr::th_x2'
/usr/include/netinet/tcp.h:52: duplicate member `tcphdr::th_off'
gmake[2]: *** [dulfsm.o] Error 1
gmake[2]: Leaving directory `/projects/mtdyna/related_software/dcmtk350_rc1/dcmnet/libsrc'
gmake[1]: *** [libsrc-all] Error 2
gmake[1]: Leaving directory `/projects/mtdyna/related_software/dcmtk350_rc1/dcmnet'
gmake: *** [dcmnet-all] Error 2