Slic3r hangs with Strawberry Perl 5.24.0.1 / 64bit

[bubnikv]

Slic3r hangs when a C++ exception is thrown / catched and a subsequent perl croak() function is executed. This makes a 64bit build on Windows / Strawberry Perl hang every time a c++ exception is used to relay a return value. For example, Slic3r hangs if objects do not fit the print bed.

The problem is caused by the Strawberry Perl. I don't see a simple cure. In the Prusa3D fork I re-wrote the most critical C++ code (automatic component placement on the bed, print validation) to not throw exceptions, but my gut feeling is this is not enough. Considering to prepare a "Vojtech's own Perl" distribution for Windows 64bit and Visual Studio 2013, containing all the libraries precompiled.

[bubnikv]

Tested with Strawberry 5.18.4.1, 5.20.0.1, 5.20.2.1, 5.24.0.1.
Strawberry 32bit builds work all right, but the last Strawberry 64bit build working correctly is 5.18.4.1. Starting with 5.20.0.1, the C++ exceptions together with a croak() lead to a hangup. Very possibly one gets the same hangup when running one of the test cases of Perl Wx module.

I created a test case to test for the broken C++ exceptions:
prusa3d/PrusaSlicer@aac9681

[bubnikv]

Very possibly one gets the same hangup when running one of the test cases of Perl Wx module.

Indeed, I have not had the usual hangup of a test case of the Wx package with Strawberry Perl 5.18.4.1 64bit.

[alranel]

Upstream report: https://rt.cpan.org/Public/Bug/Display.html?id=118635

[bubnikv]

A possible solution is to use the Visual Studio perl builds.

https://bintray.com/bubnikv/wxPerl-for-Slic3r-with-VisualStudio/wperl

[lordofhyphens]

It's not specifically Perl, it's GCC and the exception model used with MinGW-GCC (SJLJ). Specifically, GCC > 4.8 with sjlj has this bug (and it affects more than Slic3r). Newer Mingw-GCC versions (>5.4.0) have SEH exceptions enabled and those should be used instead of SJLJ.

I've modified Perl-Dist-Strawberry to use Mingw64 6.3.0 with SEH exceptions and stripped out most of the unused modules (that aren't in CORE anyway). There were some other "interesting" things I had to deal with (at least on my system).

https://bintray.com/lordofhyphens/Slic3r/download_file?file_path=slic3r-perl-5.24.1.4-64bit-portable.zip
https://bintray.com/lordofhyphens/Slic3r/download_file?file_path=slic3r-perl-5.24.1.4-64bit.msi
https://bintray.com/lordofhyphens/Slic3r/download_file?file_path=slic3r-perl-5.24.1.4-64bit.zip

We can stop using our version after an upstream version of Strawberry Perl uses one of the SEH builds or we shed the need for perl.
See #3815