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Segfault caused by reversesub in OpenType feature #2881

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sevmeyer opened this issue Sep 30, 2016 · 1 comment
Open

Segfault caused by reversesub in OpenType feature #2881

sevmeyer opened this issue Sep 30, 2016 · 1 comment
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@sevmeyer
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sevmeyer commented Sep 30, 2016 •
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FontForge 20160929
openSUSE 13.1

Merging a .fea file that contains a reversesub rule will cause a segmentation fault when trying to generate the font. This happens with the GUI and the python library.

A minimal example of such a feature file:

feature liga {
    reversesub A' B by C;
} liga;

For comparison, the file works fine with FontTools.
@sh1boot
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sh1boot commented Sep 14, 2023

This bug gets an honourable mention here:
https://blog.janestreet.com/commas-in-big-numbers-everywhere/

It turns out there’s been an open issue about this for years but “reversesub” rules are so infrequently used that it hasn’t been fixed. So I switched to using fontTools to add in my feature files, and it worked!

I was hoping to do away with that workaround because it's adding other complexity.

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@sh1boot @jtanx @sevmeyer