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Put the missing flag in your cmakelist file.
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-----Original Message-----
From: Jonathan Fisher 
<>

Date: Thu, 1 Oct 2009 19:03:06 
To: 
<>
Subject: [cgal-discuss] Assertion thrown -- wrong rounding


I'm developing an app which uses CGAL, and I am getting an assertion  
thrown in during initialization.  The explanation is: "Wrong rounding:  
did you forget the -frounding-math option if you use GCC?"

I installed CGAL using cmake (with the cmake-gui) following the  
instructions in the CGAL installation manual.  Can anyone suggest what  
I might look for in tracking down the problem? -- it would be much  
appreciated.

I have previously run the app without errors on a PowerPC platform,  
and I recently moved the app to an Intel Mac (with a new installation  
of CGAL).  I had had some trouble linking the app, getting error  
messages about undefined CGAL symbols (including symbols about  
assertions).  I got the build to complete without errors, and now I am  
getting the assertion thrown at runtime.

A minimal amount of grepping around in the makefiles indicates that  
the frounding-math option is on.

I am using CGAL 3.4, with Xcode 3.2, under Mac OS 10.6.1; the Boost  
version is 1_40_0.

The Console report on the error follows --

10/1/09 6:25:18 PM      [0x0-0x152152].com.yourcompany.EpModelCo[6475]   
terminate called after throwing an instance of  
'CGAL::Assertion_exception'
10/1/09 6:25:18 PM      [0x0-0x152152].com.yourcompany.EpModelCo[6475]     
what():  CGAL ERROR: assertion violation!
10/1/09 6:25:18 PM      [0x0-0x152152].com.yourcompany.EpModelCo[6475]   
Expr: -CGAL_IA_MUL(-1.1, 10.1) != CGAL_IA_MUL(1.1, 10.1)
10/1/09 6:25:18 PM      [0x0-0x152152].com.yourcompany.EpModelCo[6475]   
File: /usr/local/include/CGAL/Interval_nt.h
10/1/09 6:25:18 PM      [0x0-0x152152].com.yourcompany.EpModelCo[6475]   
Line: 154
10/1/09 6:25:18 PM      [0x0-0x152152].com.yourcompany.EpModelCo[6475]   
Explanation: Wrong rounding: did you forget the -frounding-math option  
if you use GCC?
10/1/09 6:25:23 PM      com.apple.launchd.peruser.502[501]       
([0x0-0x152152].com.yourcompany.EpModelCo[6475]) Job appears to have  
crashed: Abort trap
10/1/09 6:25:24 PM      ReportCrash[6478]       Saved crash report for  
EpModelCo[6475] version ??? (???) to /Users/jonathan/Library/Logs/ 
DiagnosticReports/EpModelCo_2009-10-01-182524_Fermat.crash
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