When loading qtdeclarative from the 5.8 branch, which is configured as a shadowbuild, creator always wants to run the qmake step. Always, even when in the previous build it did run (and complete). The makefile holds the following line:

# Command: /Users/erik/dev/builds/qt5-stable-debug/qtbase/bin/qmake -o Makefile /Users/erik/dev/qt5-stable/qtdeclarative/qtdeclarative.pro -spec macx-clang CONFIG+=x86_64 CONFIG+=disassembler