view etc/README.Cygwin @ 15564:b66be1cb12ca default tip

Merge proper file rename
author Jordi Gutiérrez Hermoso <>
date Thu, 25 Oct 2012 16:48:35 -0400
parents 2f05228cb959
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Starting with version 3.0.1, Octave is once again part of the normal
net distribution of Cygwin, available from  

It is possible to build Octave from source on Windows systems with Cygwin,
but with the old gcc-3.4.4-3 compiler there are some performance
problems related to the way C++ exception handling is implemented.
This is a known problem with a long history and it is STRONGLY 
encouraged to use gcc-4.3.2-1 or later.

Current binary versions are built with gcc-4.5.3-3.  

------- SUGGESTED CONFIGURATION  ---------------------------

The latest development Octave development sources (octave-3.5.91+)
are built with:

configure --enable-shared \
          --enable-float-truncate \
          CC=gcc-4 F77=gfortran-4 CXX=g++-4 CPP=cpp-4 
          lt_cv_deplibs_check_method=pass_all \

"--enable-float-truncate" is needed for the following bug:
Without it, one of the quadgk test will fail as
"a=a" could be false due to truncation problems with 
complex numbers. 

"lt_cv_deplibs_check_method=pass_all"  is needed to bypass
incorrect libtool detection of system capabilities and
to allow shared libs building.

"LDFLAGS=-Wl,-no-undefined" is better than previous 
"LDFLAGS=-no-undefined" as gcc-4 is now complaining about
unknown command and the "undefined" is for the linker.

The additional patch used for 3.4.3-3 package can also be 
needed for 3.6.x (see below).

------- SUGGESTION FOR FORK ISSUE --------------------------

The build process can fails in building images for documentation 
due to fork issue of the octave dll just built. In such case 
I suggest to rebase the built dll's with:

$ find build_tree -name "*.dll"  > rebase_list

and after closing all cygwin process, from a dash shell

$ rebaseall -s 'dll|so|oct' -T /full_path/rebase_list

After rebasing the "make" should be able to complete the
creation of the images and the documentation. 


Octave-3.4.3-3 package was built using:

configure --libexecdir=/usr/lib \
          --enable-shared \
          --enable-float-truncate \
          F77=gfortran-4 \
          lt_cv_deplibs_check_method=pass_all \

plus and additional patch to solve a specific cygwin 
fltk print issue, see:

Octave-3.2.4 was built using:

configure --enable-shared \
          --without-fltk \
          --without-framework-opengl \
          CC=gcc-4 F77=gfortran-4 CXX=g++-4 CPP=cpp-4

Current Cygwin package maintainer for Octave:

  Marco Atzeri

Marco Atzeri

Last updated: Tue Jan  3 14:40:58 WEST 2012