SpellChecker 1.2.0 works great on macOS Sierra with Qt Creator 4.6 and Hunspell 1.7.0.
http://pankdm.github.io/hunspell.html
brew install hunspell
and may require
sudo ln -s /usr/local/lib/libhunspell-1.7.dylib /usr/local/lib/libhunspell.dylib
sudo ln -sf /usr/local/lib/libhunspell-1.7.a /usr/local/lib/libhunspell.a
SpellChecker 1.2.0 compiled from source https://github.com/CJCombrink/SpellChecker-Plugin/releases with Qt Creator 4.6.
/Users/myuser/Documents/qtc/qt-creator-opensource-src-4.6.0/src/plugins/plugins.pro
SUBDIRS = \
spellchecker \
...
/Users/myuser/Documents/qtc/qt-creator-opensource-src-4.6.0/src/plugins/spellchecker/spellchecker_local_paths.pri
LOCAL_QTCREATOR_SOURCES=/Users/myuser/Documents/qtc/qt-creator-opensource-src-4.6.0
unix {
Debug :LOCAL_IDE_BUILD_TREE=/Users/myuser/Documents/qtc/build-qtcreator-Desktop_Qt_5_10_1_clang_64bit-Debug
Release:LOCAL_IDE_BUILD_TREE=/Users/myuser/Documents/qtc/build-qtcreator-Desktop_Qt_5_10_1_clang_64bit-Release
LOCAL_HUNSPELL_LIB_DIR=/usr/local/lib
LOCAL_HUNSPELL_SRC_DIR=/usr/local/include
}
Plan to test with Qt Creator 4.8.
Thanks!