Fontforge: FontForge segfaults when instantiating a new font if compiled with the UI disabled

[felixhagspiel]

Hello,

I got a new macbook and tried to run fontcustom, but I always get the error errorfontforgecompilation failed. Try again with --debug for more details.. After some research it seems that it is still working with the version 20170104. How can I downgrade to this version? If I do brew search fontforge I only see the latest version.

currently I got:
fontcustom 1.3.8
fontforge 20170806

Thanks!

[JakeBeresford]

Same issue here, I dont see this version of fontforge in the releases. Could you please point me towards the changes for this release so that I can patch fontcustom if necessary.

[jtanx]

This is a segfault (see also: https://github.com/FontCustom/fontcustom/issues/355). Probably homebrew or python related.

I can see this happen on OS X, but not on Windows. As for installing an older version, I have no idea. Perhaps raise a ticket on Homebrew or something.

I'll try to debug this... But just looking at the script, there are so many levels of wrong with it I don't know...

(lldb) r
Process 39117 launched: '/usr/local/bin/fontforge' (x86_64)
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Based on sources from 22:29 UTC  8-Sep-2017-D.
 Based on source from git with hash: 7a64371d449911e4af23d9bbb91150b80d31d4bb
Process 39117 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x1604478)
    frame #0: 0x0000000100383fc2 libfontforge.2.dylib`SplineFontNew at splineutil2.c:3890
   3887
   3888 SplineFont *SplineFontNew(void) {
   3889     SplineFont *sf;
-> 3890     int enclen = default_encoding->char_cnt;
   3891
   3892     sf = SplineFontBlank(enclen);
   3893     sf->onlybitmaps = true;
(lldb) p default_encoding
(Encoding *) $0 = 0x0000000001604470
(lldb) p default_encoding->char_cnt
error: Couldn't apply expression side effects : Couldn't dematerialize a result variable: couldn't read its memory
(lldb) p default_encoding
(Encoding *) $2 = 0x0000000001604470
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x1604478)
  * frame #0: 0x0000000100383fc2 libfontforge.2.dylib`SplineFontNew at splineutil2.c:3890
    frame #1: 0x0000000100258cb0 libfontforge.2.dylib`PyFF_Font_new(type=0x0000000100523df0, UNUSED_args=0x0000000102c40050, UNUSED_kwds=0x000000
0000000000) at python.c:10758
    frame #2: 0x00000001006709ae Python`type_call + 46
    frame #3: 0x0000000100615203 Python`PyObject_Call + 99
    frame #4: 0x00000001006c019d Python`PyEval_EvalFrameEx + 29965
    frame #5: 0x00000001006b8947 Python`PyEval_EvalCodeEx + 2119
    frame #6: 0x00000001006b80f6 Python`PyEval_EvalCode + 54
    frame #7: 0x00000001006e7824 Python`PyRun_FileExFlags + 164
    frame #8: 0x00000001006e735e Python`PyRun_SimpleFileExFlags + 702
    frame #9: 0x00000001006fdb1d Python`Py_Main + 2925
    frame #10: 0x000000010023be74 libfontforge.2.dylib`PyFF_Main(argc=4, argv=0x00007fff5fbffc98, start=2) at python.c:18656
    frame #11: 0x0000000100274ad1 libfontforge.2.dylib`_CheckIsScript(argc=4, argv=0x00007fff5fbffc98) at scripting.c:10847
    frame #12: 0x000000010027468b libfontforge.2.dylib`CheckIsScript(argc=4, argv=0x00007fff5fbffc98) at scripting.c:10886
    frame #13: 0x000000010008f9f1 libfontforgeexe.2.dylib`fontforge_main(argc=4, argv=0x00007fff5fbffc98) at startnoui.c:113
    frame #14: 0x0000000100000f82 fontforge`main(argc=4, argv=0x00007fff5fbffc98) at main.c:39
    frame #15: 0x00007fff9964a255 libdyld.dylib`start + 1
    frame #16: 0x00007fff9964a255 libdyld.dylib`start + 1

[jtanx]

Minimal test case (can be reproduced on linux):

./configure --without-x --disable-python-{scripting,extension}
make -j4 && make install

fontforge -lang=ff -c "New()"

[jtanx]

 CC       libfontforgeexe_la-startnoui.lo
startnoui.c: In function ‘fontforge_main’:
startnoui.c:110:22: warning: implicit declaration of function ‘FindOrMakeEncoding’ [-Wimplicit-function-declaration]
     default_encoding=FindOrMakeEncoding("ISO8859-1");
                      ^~~~~~~~~~~~~~~~~~
startnoui.c:110:21: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     default_encoding=FindOrMakeEncoding("ISO8859-1");

Well then...

[jtanx]

@felixhagspiel / @JakeBeresford a fix was merged into Homebrew so if you update your installed version of fontforge (20170731 pkgrel 2), I think it should work now. It should also work with the official releases since they are compiled with ui support and wouldn't be affected likewise.

[felixhagspiel]

Works! Thank you so much 👍