CGAL users discussion list

[Shamyl Zakariya <>]

I just installed CGAL 3.4 ( was using 3.1 ) and on running my app,
CGAL terminates with the following error during static initialization:

terminate called after throwing an instance of 'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
Expr: -CGAL_IA_MUL(-1.1, 10.1) != CGAL_IA_MUL(1.1, 10.1)
File: /usr/local/include/CGAL/Interval_nt.h
Line: 154
Explanation: Wrong rounding: did you forget the -frounding-math option
if you use GCC?

This is on Mac OS X, 10.5.7

So, assuming I made some sort of mistake during the configuration of
CGAL, I redownloaded the tarball and reconfigured it as such:

# cmake . -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=FALSE

And I'm seeing the following during configuration, which implies to me
that the build system is automatically adding -frounding-math...

-- Targetting Unix Makefiles
-- Using /opt/local/bin/c++ compiler.
-- DARWIN_VERSION=9
-- Mac Leopard detected
-- USING CMake version: 2.6.4
-- System: Darwin
-- USING GCC_VERSION = '4.0.1 (Apple Inc. build 5490)'
-- Using gcc version 4 or later. Adding -frounding-math
-- Build type: Release
-- USING CXXFLAGS = ' -frounding-math -O3 -DNDEBUG'

However, ever after this rebuild/reinstall my apps still die on the assertion.

(Please note, I'm not using any of the optional numeric packages, and
I'm using boost 1.36, and cmake 2.6)