[Github-comments] [geany/geany-plugins] Splitting a snowman in half crashes Geany with Spell Check (inserting a space before Unicode VARIATION SELECTOR-16) (#1041)

[Colomban Wendling]

> FTR the cflags in Fedora are:
> […]
> And ldflags:

Ah-ah!  We got a winner.  If I build Geany with those flags (minus the `-spec` parameters that obviously don't work on my Debian):
```shell
$ export LDFLAGS="-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now"
$ export CFLAGS="-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong  -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection"
$ export CXXFLAGS="$CFLAGS"
$ ./autogen.sh --prefix=/tmp/_install
[…]
$ make -j4 install
[…]
$ /tmp/_install/bin/geany -c /tmp/_conf
/usr/include/c++/8/bits/stl_vector.h:950: std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = unsigned char; _Alloc = std::allocator<unsigned char>; std::vector<_Tp, _Alloc>::const_reference = const unsigned char&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed.
```

Without testing further, my money would go on `-D_GLIBCXX_ASSERTIONS`.

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