cgal and emscripten

[Alessio Mochi]

Hello,

I am not able to compile 

this piece of code of cgal library

CGAL_assertion_msg(-CGAL_IA_MUL(-1.1, 10.1) != CGAL_IA_MUL(1.1, 10.1),

"Wrong rounding: did you forget the -frounding-math option if you use GCC (or -fp-model strict for Intel)?");

CGAL_assertion_msg(-CGAL_IA_DIV(-1., 10) != CGAL_IA_DIV(1., 10),

"Wrong rounding: did you forget the -frounding-math option if you use GCC (or -fp-model strict for Intel)?");

I tried to use -frounding-math with a simple example with this compiler flag

I get a warning and I think this flag is not supported.

I am able to compile cgal library if exclude this code but when I run the cgal corefine example I get crash. Is it possible that the missed flag can change the CGAL calculations?

[Floh]

I suspect that this isn't a WASM issue, but a gcc vs clang issue, see this cgal issue thread:

https://github.com/CGAL/cgal/issues/3180

Also there seems to be clang-specific workarounds here:

https://github.com/CGAL/cgal/blob/7461cd7c705dff6459d9f1aee4fbfd55ed10d0d4/Number_types/include/CGAL/FPU.h#L286-L305

...and this CGAL_FPU_HAS_EXCESS_PRECISION define is here:

https://github.com/CGAL/cgal/blob/7461cd7c705dff6459d9f1aee4fbfd55ed10d0d4/Number_types/include/CGAL/FPU.h#L84-L96

...all those hardwired x86 architecture checks look a bit suspicious. I guess the platform/compiler detection in cgal fails when compiling for WASM.

Cheers,

-Floh.

[Alessio Mochi]

emscripen will support  -frounding-math in the next release?

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[Liam]

Hello, I am Liam.

I saw your article on emscripten-discuss. Can you tell me about your project? For example, how to include the CGAL library when building with emscripten.

I heard that with the CGAL 5.3 release, an option related to your problem has been added. I expect this option will solve your problem.

best regards

2020년 10월 21일 수요일 오전 1시 20분 28초 UTC+9에 ale2...@gmail.com님이 작성: