CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 01/20/2013 02:08 AM, christophe malvasio wrote:
> hi
> why cmake turn off eigen3 opengl and zlib usage ?
> is eigein-blas/lapack not usable ?
At CGAL build time,  OpenGL is needed by libCGAL_Qt4, as well as 
libCGAL_ImageIO [1], and zlib is needed by libCGAL_ImageIO [2].
So I don't understand why you are saying that cmake turn them off.

Eigen3, is not needed to build CGAL, so the configurationis done when 
you want to use it (like in examples of Surface_reconstruction_point_3 
for example).


> in CMakeLists.txt :
>      if ( "${GCC_VERSION}" MATCHES "^4.2" )
>        message( STATUS "Using gcc version 4.2. Adding
> -fno-strict-aliasing" )
>        uniquely_add_flags( CGAL_CXX_FLAGS "-fno-strict-aliasing" )
>      endif()
> nothing more for higher gcc ?
This was intended to fix a bug in GCC 4.2, only the frounding-math
flag is need for other 4 versions ( see     if ( "${GCC_VERSION}" 
MATCHES "^4." ) )

> (i have 4.8.0 but i don't know c++ and CGAL so no idea flags to use)
> also are you all in freebsd to use this regex ?
What do you mean?

> this file is less horrible than the eigen3 one but not good enough
> cmake output give :-- USING OPENGL_VERSION = '2.1'
> mesa give 3.0 no use ?
What is the problem here? The opengl dectected is not the one
you would like to use?

Sebastien.

[1] 
http://www.cgal.org/Manual/latest/doc_html/installation_manual/Chapter_installation_manual.html#Subsection_8.4
[2] 
http://www.cgal.org/Manual/latest/doc_html/installation_manual/Chapter_installation_manual.html#Subsection_8.5

> thanks